JP6672943B2 - Substance source estimation method and substance source estimation device - Google Patents

Description

  The present invention relates to a substance generation source estimation method and a substance generation source estimation device.

  In recent years, release of environmentally harmful gases into the atmosphere has become a major social problem, and regulations are becoming stricter year by year. In particular, it is important to address environmentally harmful gases such as exhaust gas emitted from factories or vehicles into the atmosphere. It is important to take measures to reduce environmentally harmful gases diffused into the atmosphere by accurately and quickly grasping the generation behavior of various types of measurement target substances that constitute environmentally harmful gases. is there. In particular, in the atmosphere, since environmental conditions at measurement points such as a wind direction and a wind speed change moment by moment, the measurement result of the substance to be measured can greatly change in a short time. Therefore, it is difficult to grasp the generation behavior of the measurement target substance simply by measuring the measurement target substance.

  On the other hand, in order to more accurately and promptly grasp the generation behavior of a substance to be measured, a technology for analyzing the generation behavior using measurement results is being developed. For example, Patent Literature 1 below discloses a source having a large contribution to a measured target substance by performing a simulation using a measurement result of a molecular concentration of the target substance and environmental conditions such as a wind direction and a wind speed as boundary conditions. Is disclosed.

  In addition, technology for specifying the point of the source of the substance to be measured has been developed. For example, Japanese Patent Application Laid-Open No. H11-163873 describes whether or not a coordinate point commonly included in a source search area set for a plurality of measurement points is a point of the source, and estimates the measured values at the plurality of measurement points. There is disclosed a technique for making a determination based on the above. Patent Literature 3 below discloses a technique of measuring a gas concentration while moving, and performing a spatial scale analysis using the measurement result to specify a point of a generation source. In addition, Patent Document 4 below discloses a technique for specifying an intersection of a circle centered on two measurement points calculated based on wind speeds and measured values at two measurement points as a point of a generation source. I have.

JP 2015-172494 A International Publication No. 2013/24875 JP-T-2015-532436A JP 2014-52245 A

  By the way, the flow of wind in a factory or land around the factory is greatly affected by the surrounding environment such as the location of a building. For example, in an area where buildings are densely packed, it is conceivable that the wind flow may bend a gap or a passage in the building. Therefore, for example, the generation source does not always exist in the windward direction at the measurement point of the measurement target substance.

  The techniques disclosed in the above Patent Documents 1 to 4 merely estimate the generation behavior of the measurement target substance at the point of the generation source or the generation source based on the wind direction and the wind speed at the measurement point of the measurement target substance. Therefore, it is difficult to accurately estimate the location of the source of the target substance in the surrounding environment as described above.

  Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to increase the location of a source of a substance to be measured in consideration of the influence of the surrounding environment such as the location of a building. It is an object of the present invention to provide a new and improved substance generation source estimation method and substance generation source estimation device capable of performing highly accurate estimation.

In order to solve the above problems, according to an aspect of the present invention, there is provided a substance generation source estimation method for estimating a point of a generation source of a measurement target substance, wherein a molecular concentration of the measurement target substance at a first measurement point, A measuring step of sequentially measuring a wind direction and a wind speed, and, based on the measured molecular concentration, the wind direction and the wind speed, a representative molecular concentration, a representative wind direction and a representative wind speed of the substance to be measured at the first measurement point. A representative value setting step to be set, and a plurality of simulation models relating to a wind flow in a predetermined region calculated in advance, corresponding to the representative wind direction and the representative wind speed at the first measurement point set in the representative value setting step. Selecting a corresponding model indicating the wind flow to be performed, and selecting the corresponding model, the upper model at the first measurement point. Representative molecule concentration and the representative wind speed and based on the assumption molecular concentration of the analyte in the source, viewed contains a source point estimation step of estimating a location of the source, and the representative value setting step The measurement result measured in the measurement step, based on the measurement result when the molecular concentration of the measurement target substance is greater than or equal to a predetermined reference value, the representative molecular concentration of the measurement target substance, the representative wind direction And a method of estimating a substance generation source , wherein the representative wind speed is set .

  The substance generation source estimation method may further include a concentration determination step of determining whether or not the estimation of the point of the source is completed based on the representative molecular concentration at the first measurement point.

  In the concentration determination step, when the representative molecule concentration at the first measurement point is equal to or higher than the assumed molecule concentration, it may be determined that the estimation of the source is completed.

  When it is determined in the concentration determination step that the estimation of the point of the source is not completed, the method of estimating the substance source sets a second measurement point based on the wind flow at the first measurement point. The method may further include a second measurement point setting step.

  The second measurement point may be set to be more windward than the first measurement point of the wind flow at the first measurement point indicated by the corresponding model selected in the model selection step.

  The second measurement point may be set based on the point of the source estimated using the wind flow at the first measurement point in the source point estimation step and the first measurement point. Good.

  The second measurement point may be set to the point of the source estimated in the source point estimation step.

  In the concentration determining step, when it is determined that the estimation of the point of the source is not completed by the representative molecule concentration at the second measurement point being lower than the representative molecule concentration at the first measurement point, The method for estimating a substance generation source sets a third measurement point in the wind direction at the first measurement point indicated by the corresponding model acquired in the model selection step, in a leeward direction from the second measurement point. The method may further include a measurement point setting step.

  The method for estimating a substance source determines that the estimation of the source has been completed when the distance between the point of the source estimated in the source point estimating step and the first measurement point is equal to or less than a predetermined distance. May be further included.

  In the representative value setting step, among the measurement results measured in the measurement step, based on the measurement result when the molecular concentration of the measurement target substance is equal to or higher than a predetermined reference value, the representative value of the measurement target substance is determined. The molecular concentration, the representative wind direction, and the representative wind speed may be set.

  In the measurement step, the molecular concentration of the substance to be measured may be measured by a measurement device using single photon ionization-mass spectrometry (SPI-MS).

  In the measurement step, the wind direction and the wind speed at the measurement point may be measured by a two-dimensional sound wave anemometer.

  The substance generation source estimation method may sequentially estimate a point of the generation source while moving in a vehicle.

According to another aspect of the present invention, there is provided a substance generation source estimating apparatus for sequentially estimating a point of a source of a substance to be measured, the apparatus further comprising: A molecular concentration measuring device that sequentially measures the molecular concentration of the, a wind direction anemometer that sequentially measures the wind direction and the wind speed at the measurement point, and based on the measured molecular concentration, the wind direction and the wind speed, A setting unit that sets a representative molecular concentration, a representative wind direction, and a representative wind speed of the substance to be measured at a measurement point; a storage unit that stores a plurality of simulation models related to a wind flow in a predetermined region calculated in advance; and the storage unit. Corresponding to the representative wind direction and the representative wind speed at the measurement point set by the setting unit from the plurality of simulation models stored in A selection unit that selects a corresponding model indicating the wind flow, based on the selected corresponding model, the representative molecular concentration and the representative wind speed at the measurement point, and the assumed molecular concentration of the measurement target substance at the source. , e Bei and a source point estimating unit that estimates a point of the source, the setting section, of the molecule concentration measuring apparatus and the measured at anemometer result, molecules of the analyte A substance generation source estimating apparatus is provided that sets the representative molecular concentration, the representative wind direction, and the representative wind speed of the measurement target substance based on a measurement result when the concentration indicates a predetermined reference value or more .

  According to such a configuration, by using a simulation model (corresponding model) selected based on the measurement result at the measurement point, it is possible to trace the wind flow from the measurement point to the point of the generation source. This makes it possible to more accurately estimate the location of the source of the measurement target substance. Further, it is possible to perform a search process of moving to a new measurement point using the result of the estimation process and repeating the estimation process again. As a result, the point of the source can be specified more quickly.

  As described above, according to the present invention, it is possible to more accurately estimate the location of the source of a substance to be measured in consideration of the influence of the surrounding environment such as the location of a building.

1 is a diagram illustrating an example of a schematic configuration of a substance generation source estimation device 1 according to an embodiment of the present invention. It is a figure showing an example of composition of material generation source estimating device 1-1 concerning a 1st embodiment of the present invention. FIG. 4 is a diagram for explaining an example of a representative value setting process by a representative value setting unit 101 according to the embodiment. It is a figure showing an example of a simulation model concerning a wind flow in a part in a predetermined field. It is an example of the graph which shows the relationship between the distance from the generation source (molecular concentration = 1 ppm), and the molecular concentration of the measurement object substance for every wind speed. It is a flowchart which shows an example of the flow of the estimation process by the substance generation | occurrence | production source estimation apparatus 1-1 concerning the embodiment. It is a figure showing an example of composition of substance generation source estimating device 1-2 concerning a 2nd embodiment of the present invention. It is a figure for explaining an example of a setting method of a movement distance from a measurement point to a movement point. It is a flowchart which shows an example of the flow of the search processing by the substance generation | occurrence | production source estimation apparatus 1-2 concerning the embodiment. Is a diagram for explaining a point recommended as measuring location X ₁ in the first search processing. FIG. 2 is a block diagram illustrating an example of a hardware configuration of the information processing apparatus according to the embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

<< 1. Outline of substance source estimation device >>
FIG. 1 is a diagram illustrating an example of a schematic configuration of a substance generation source estimation device 1 according to an embodiment of the present invention. Referring to FIG. 1, a substance generation source estimation device 1 includes a vehicle 2, an information processing device 10, a molecular concentration measurement device 20, and an anemometer 30. The substance generation source estimating apparatus 1 further includes a battery box not shown in FIG.

  The vehicle 2 is a transport machine on which the information processing device 10, the molecular concentration measurement device 20, the wind direction and anemometer 30, and the battery box are mounted. The vehicle 2 is a self-propelled vehicle such as a car, truck, bus, two-wheeled vehicle, construction machine, or railway vehicle, or other power source such as a cart, a cart, a wagon, a bogie, a handlift, a pallet truck, or a bicycle. The vehicle may be a vehicle that can travel. The vehicle 2 is not particularly limited as long as it can move with the information processing device 10, the molecular concentration measuring device 20, the anemometer 30 and the battery box described above mounted thereon. The vehicle 2 moves to the estimated source point or the next measurement point, for example, based on the estimation result of the source point by the information processing device 10. Thereby, at the measurement point after the movement, the point of the generation source can be estimated again.

  The information processing apparatus 10 is realized by an information processing apparatus having a hardware configuration such as a CPU (Central Processor Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a storage, an input / output device, and a communication device. The information processing device 10 may be realized by, for example, a PC (Personal Computer), a tablet, a smartphone, or the like. The information processing device 10 is configured to determine the molecular concentration of the substance to be measured measured by the molecular concentration measuring device 20 and the wind direction and wind speed at the measurement point measured by the wind direction anemometer 30 so as to determine the concentration within a predetermined area including the measurement point. This is a device that selects a corresponding model corresponding to a wind flow, estimates a point of a source of the measurement target substance using the corresponding model, or performs a process related to searching for the source. The configuration and function of each functional unit included in the information processing device 10 and the specific hardware configuration of the information processing device 10 will be described later.

  The molecular concentration measuring device 20 is a device that measures the molecular concentration of a measurement target substance contained in atmospheric gas. Further, the molecular concentration measurement device 20 has a gas introduction pipe 21. The gas introduction pipe 21 has an inlet for introducing atmospheric gas at one end, and is connected to the molecular concentration measurement device 20 at the other end. The molecular concentration measuring device 20 introduces atmospheric gas from the atmosphere through a gas introduction pipe 21 and measures the molecular concentration of a substance to be measured contained in the introduced atmospheric gas. The material and the like of the gas introduction pipe 21 are not particularly limited. However, in order to be able to introduce atmospheric gas around the substance generation source estimating apparatus 1, the gas introduction pipe 21 preferably has a stretchable hose-like structure.

  In the molecular concentration measuring device 20 according to the present embodiment, it is preferable that the detectable concentration range of the molecular concentration of the substance to be measured is as wide as possible. Further, it is preferable that the molecular concentration measurement device 20 according to the present embodiment identifies a plurality of types of measurement target substances. Further, the molecular concentration measuring device 20 according to the present embodiment is preferably a measuring device capable of sequentially measuring the molecular concentration in a short time in order to estimate the point of the source in real time.

  As an example of the molecular concentration measurement device 20 that satisfies the above requirements, there is a laser ionization mass spectrometer that ionizes a substance to be measured by irradiating a laser beam. More specifically, the molecular concentration measuring device 20 is preferably an SPI-MS device.

  The SPI-MS apparatus includes a gas introduction unit that sucks a gas by a pump such as a turbo molecular pump, a laser unit that oscillates a laser beam, an ionization unit that ionizes molecules contained in the gas introduced by the gas introduction unit with a laser beam, And a mass spectrometer that performs mass spectrometry of the ionized molecules. With the SPI-MS device, for example, a substance to be measured can be ionized with one photon. Therefore, the mass of the substance to be measured can be quickly analyzed, so that the molecular concentration of the substance to be measured can be measured in real time. For example, a general SPI-MS device can output a measurement result of a concentration of a molecule contained in a gas within about one second after the gas is introduced. The lower limit of detection of the molecular concentration by a general SPI-MS device is about 1 ppb. Therefore, a low-concentration substance to be measured can be detected.

  Note that, in the present embodiment, the measurement target substance is, for example, a harmful molecule or the like that can affect the human body, which is contained in an environmental load gas, and more specifically, an aromatic molecule such as benzene, naphthalene, or cresol. It is. Further, these harmful molecules may be, for example, volatile molecules released from a factory by dry distillation or heat treatment of coal, coke, tar or the like.

  The molecular concentration measurement device 20 outputs the measurement result to the information processing device 10.

  The wind direction anemometer 30 is a device that measures a wind direction and a wind speed at a measurement point. An anemometer 30 is provided outside the vehicle 2. In order to more accurately measure the wind direction and the wind speed at the measurement point, the wind direction anemometer 30 is preferably, for example, a two-dimensional sound wave type wind direction and wind speed measuring device. In order to keep the estimation accuracy of the source high, it is preferable that the anemometer 30 according to the present embodiment can measure the wind direction in at least 16 directions and the wind speed in at least three stages.

  The anemometer 30 outputs the measurement result to the information processing device 10.

  The molecular concentration measuring device 20 and the wind direction anemometer 30 measure the molecular concentration, the wind direction and the wind speed at a predetermined cycle. It is preferable that the timing of measuring the molecular concentration by the molecular concentration measuring device 20 and the timing of measuring the wind direction and the wind speed by the anemometer 30 are synchronized. The predetermined period is appropriately set according to the speed required for estimating the generation source and the measurement accuracy of the molecular concentration measurement device 20. In the present embodiment, if the molecular concentration measurement device 20 is an SPI-MS device, the predetermined cycle is preferably about 10 seconds.

  The battery box includes a battery, an inverter, a battery charger, a breaker, and the like. The DC current output from the battery is converted into an AC current by the inverter. The converted AC power is supplied to the molecular concentration measuring device 20 and the wind direction / anemometer 30 via a power cord (not shown). The converted AC power may be output to the information processing device 10. The battery box and each component provided in the battery box may be publicly known.

<< 2. First Embodiment (Estimation Processing) >>
<2.1. Configuration and Function>
Next, the substance generation source estimation device 1-1 according to the first embodiment of the present invention will be described. The substance source estimation device 1-1 according to the present embodiment has a function related to an estimation process for estimating a point of a source. Specifically, the substance generation source estimating device 1-1 according to the present embodiment calculates the wind direction and the wind speed at the measurement point from a plurality of simulation models related to the wind flow in the predetermined area based on the wind direction and the wind speed at the measurement point. A corresponding model is selected, and the location of the source is estimated using the corresponding model and measurement results such as molecular concentration. First, an example of a configuration of the substance generation source estimation device 1-1 according to the present embodiment will be described.

  FIG. 2 is a diagram illustrating an example of a configuration of the substance generation source estimation device 1-1 according to the first embodiment of the present invention. Referring to FIG. 2, the substance generation source estimating device 1-1 according to the present embodiment includes an information processing device 100, a molecular concentration measuring device 20, an anemometer 30, and a battery box 40. Since the molecular concentration measuring device 20, the wind direction anemometer 30, and the battery box 40 have the same functions as those described above, the description thereof will be omitted. Hereinafter, the configuration and functions of the information processing apparatus 100 will be described.

  As illustrated in FIG. 2, the information processing apparatus 100 includes a representative value setting unit 101, a selection unit 102, a source point estimation unit 103, a storage unit 110, and an output unit 120.

(Representative value setting section)
The representative value setting unit 101 performs the measurement based on the molecular concentration of the measurement target substance sequentially measured by the molecular concentration measuring device 20 at the measurement point, and the wind direction and the wind speed sequentially measured by the anemometer 30. The representative molecular concentration, representative wind direction, and representative wind speed of the measurement target substance at the point are set. That is, the representative value setting unit 101 sets one representative molecular concentration, a representative wind direction, and a representative wind speed based on a plurality of molecular concentrations, wind directions, and wind speeds measured during a predetermined measurement time.

  More specifically, the representative value setting unit 101 acquires a plurality of molecular concentrations, wind directions, and wind speeds (hereinafter, collectively referred to as measurement results), and based on these measurement results, represents the representative molecular concentration, the representative wind direction, and the representative wind direction. A wind speed (hereinafter, referred to as a representative value) is set. For example, the representative value setting unit 101 sets a representative value using a measurement result obtained when the molecular concentration indicates a predetermined reference value or more from the plurality of obtained measurement results. More specifically, the representative value setting unit 101 sets the most frequent wind direction among the wind directions when the molecular concentration indicates a predetermined reference value or more as the representative wind direction. Then, the representative value setting unit 101 sets the representative molecular concentration and the representative wind speed based on the molecular concentration and the wind speed measured at the same time as the wind direction set as the representative wind direction. Preferably, the predetermined reference value is set based on the molecular concentration of the measurement target substance released from the source at the point of the source. For example, it is preferable that the predetermined reference value is 1 ppb or more, which is a molecular concentration that can have a harmful effect on the human body. In order to set the representative value with high accuracy, it is preferable that the value be at least 30 ppb or more. Note that the predetermined reference value is appropriately set according to the type of the substance to be measured.

  The representative molecular concentration and the representative wind speed may be, for example, statistical values such as an average value, a median value, or a maximum value of the molecular concentration and the wind speed measured at the same time as the wind direction set as the representative wind direction. Thus, even when a plurality of sources of the measurement target substance are present in the predetermined region, it is possible to specify the molecular concentration, the wind direction, and the wind speed caused by at least one of the sources.

  FIG. 3 is a diagram for explaining an example of a representative value setting process performed by the representative value setting unit 101. The actual setting process by the representative value setting unit 101 is executed by a processor such as a CPU. As shown in FIG. 3, the processing status and the processing result of the setting process are visualized and displayed on a display device or the like. You may. Thereby, the worker using the substance generation source estimating apparatus 1-1 can know the processing status and the processing result of the setting processing.

  Referring to FIG. 3, a screen 1000 displays a wind direction / wind speed distribution chart 1001. The values in the circumferential direction of the wind direction and wind speed distribution chart 1001 indicate the azimuth of the wind direction (in the example shown in FIG. 3, 0 ° in the east, 90 ° in the north, 180 ° in the west, and 270 ° in the south). The value in the radial direction in FIG. 1001 indicates the magnitude of the wind speed (in the example shown in FIG. 3, 0.5 m / s to 4.0 m / s or more). A plurality of measurement points are displayed on a wind direction / wind speed distribution diagram 1001 shown in FIG. These measurement points are plotted on the wind direction and wind speed distribution map 1001 corresponding to the wind direction and wind speed measured by the wind direction and wind speed meter 30. The measurement points plotted on the wind direction and wind speed distribution chart 1001 are measurement points corresponding to the wind direction and the wind speed when the molecular concentration measured by the molecular concentration measuring device 20 is equal to or higher than a predetermined reference value.

  As shown in FIG. 3, it can be seen that the frequency of the measurement point whose measurement direction is substantially west (180 degrees) (the measurement point surrounded by the area 1002 indicated by the broken line) is high among the plurality of measurement points. Therefore, the representative value setting unit 101 sets the representative wind direction to west. In addition, as shown in FIG. 3, it can be seen that among the measurement points surrounded by the region 1002, the frequency of the measurement point having the wind speed of 3.0 m / s is the highest. Therefore, the representative value setting unit 101 sets the representative wind speed to 3.0 m / s.

  Further, the representative value setting unit 101 sets the above-described representative value based on a plurality of measurement results obtained during a predetermined period. However, when a representative value cannot be set from a plurality of measurement results obtained in the predetermined period (for example, when a molecular concentration equal to or higher than a reference value cannot be obtained, or when a variation in the obtained wind direction is large, etc.), The value setting unit 101 may appropriately extend the measurement result acquisition process and acquire more measurement results. The above-mentioned predetermined period can be appropriately set as a period during which a sufficient number of samples of the measurement result can be obtained. For example, when the measurement result is obtained in a cycle of 10 seconds, the above-mentioned predetermined period may be 3 minutes (the number of samples = 18).

  Further, when the variation in the wind direction is large, the representative value setting unit 101 sets the above-described predetermined value until the measurement frequency of one wind direction that can be the representative wind direction is superior to the measurement frequency of the other wind direction. The period may be extended. For example, the representative value setting unit 101 extends the predetermined period until the measurement frequency of the one wind direction becomes 1.5 times or more the measurement frequency of the wind direction with the second highest measurement frequency. Is also good. The representative value setting unit 101 may extend the predetermined period until the number of measurement points related to the one wind direction becomes five or more.

(Selection section)
The selection unit 102 is a simulation model showing a wind flow corresponding to the representative wind direction and the representative wind speed at the measurement point set by the representative value setting unit 101 from a plurality of simulation models related to the wind flow in the predetermined region calculated in advance. Select (Supported model).

  More specifically, the selecting unit 102 first obtains the representative wind direction and the representative wind speed from the representative values output from the representative value setting unit 101. Further, the selection unit 102 acquires a plurality of simulation models related to the wind flow stored in the storage unit 110.

  Here, a simulation model relating to the above-described wind flow will be described. The simulation model related to the wind flow according to the present embodiment is obtained by performing a numerical fluid simulation in which a predetermined boundary condition is applied to terrain data reflecting a building, a terrain, and a surrounding environment in a predetermined area. Be built. From the simulation model constructed by applying one boundary condition, it is possible to grasp the wind flow (wind direction and speed) at an arbitrary point in the above-mentioned predetermined area.

  Here, the predetermined region is a region that may include a source from which the measurement target substance can be released. For example, the predetermined area may be an area where harmful substances can be generated, such as a factory, a power plant, a refinery, a complex, a mine or a construction site. In addition, the predetermined region preferably further includes an outer peripheral portion of a region where the above-listed harmful substances can be generated. This is because leakage of the measurement target substance to the outer peripheral portion of the region where the harmful substance can be generated may occur. The terrain data reflecting the building, terrain, surrounding environment, and the like in such a predetermined area is constructed by a known modeling technique.

  Further, the predetermined boundary condition is a wind direction and a wind speed of a wind at a boundary portion of the above-described predetermined area. The boundary conditions are appropriately prepared by the number corresponding to the type of the wind direction and the type of the wind speed, and the simulation relating to the wind flow in the predetermined area is appropriately performed according to the number of the prepared boundary conditions. More specifically, the boundary conditions may be prepared for 16 directions and the number of wind speeds in three stages (that is, a total of 48 cases).

  In the predetermined area, a wind flow may change depending on a building such as a building, a fence, a manufacturing facility or an exhaust facility, a topography such as a height difference, and a surrounding environment. For example, when the wind collides with a building or the like, the wind flow is separated along the building or the like, or when the wind passes through a gap between a plurality of buildings, the wind speed changes greatly. Therefore, in such a predetermined region, since the wind flow changes in a complicated manner, the wind direction and the wind speed at the measurement point do not always match the wind direction and the wind speed at the point of the generation source. For example, even if the windward direction at the measurement point is obtained by measurement, the source does not always exist in the windward direction. Therefore, it is difficult to estimate the direction of the point of the source simply by using the measurement results of the wind direction and the wind speed at the measurement point.

  Therefore, the present inventors have conceived of constructing a plurality of models by performing a plurality of simulations on the wind flow in the above-described predetermined region, and using a model that best matches the wind direction and the wind speed at the measurement point from the models. did. It is considered that the model in which the wind direction and wind speed measured at the measurement point most closely match the wind flow at the position on the model corresponding to the measurement point best reproduces the wind flow in the above-mentioned predetermined area. Can be That is, if the wind flow in the above-mentioned predetermined area can be specified from the measurement result at the measurement point, it is possible to estimate the point of the generation source based on the wind flow.

  The selection unit 102 according to the present embodiment, from among the plurality of simulation models acquired from the storage unit 110, measures the wind direction and the wind speed at the measurement point and the wind flow at the position on the model corresponding to the measurement point. Then, a model in which the measurement result and the wind flow best match is selected as a corresponding model.

  FIG. 4 is a diagram illustrating an example of a simulation model related to a wind flow in a part of a predetermined area. Referring to FIG. 4, in the simulation model, a plurality of buildings, tanks, and objects corresponding to chimneys included in a part of a predetermined area are arranged. In addition, a plurality of arrows shown in the drawing indicate wind flows according to the simulation model. The direction of the arrow indicates the wind direction, and the length of the arrow indicates the wind speed. As the boundary conditions of the simulation model shown in FIG. 4, a wind in which the upper side of the figure is windward and the lower side of the figure is leeward is set. In this case, as shown in FIG. 4, the wind direction of the wind flow around the building is different from the wind direction according to the boundary condition. Further, it is shown that the wind speed of the wind flow around the building is locally large or small.

  For example, when the wind direction and the wind speed at the measurement point match the wind flow of the model, it is considered that the point of the generation source is a point of the wind flow at the measurement point that goes backward in the windward direction on the model. As described above, by using the model selected based on the wind direction and the wind speed at the measurement point, it is possible to more accurately estimate the point of the generation source in the subsequent processing.

(Source point estimation unit)
The source point estimation unit 103 estimates the representative molecular concentration and the representative wind speed set by the representative value setting unit 101, the corresponding model selected by the selection unit 102, and the measurement target substance in the source obtained from the storage unit 110. Estimate the location of the source based on the molecular concentration.

  Specifically, first, the source point estimating unit 103 uses the representative molecular concentration, the assumed molecular concentration, and the representative wind speed to measure the distance along the wind flow from the measurement point to the source point (hereinafter, the estimated distance). ).

  Here, the assumed molecular concentration is an assumed value of the molecular concentration of the measurement target substance in the source. Since the actual molecular concentration of the substance to be measured at the source is often unknown, the assumed molecular concentration can be appropriately set according to the detection target or the like as the source. For example, the assumed molecular concentration is preferably 1 ppm.

  In addition, if the molecular concentration of the target substance at the source is estimated to deviate significantly from the assumed molecular concentration during the process of estimating the source, the value of the assumed molecular concentration can be appropriately adjusted. It is. For example, when it is estimated that the molecular concentration of the measurement target substance in the generation source is higher than the assumed molecular concentration, the value of the assumed molecular concentration may be reset to a value larger than the initial value. On the other hand, when it is estimated that the molecular concentration of the measurement target substance in the generation source is lower than the assumed molecular concentration, the value of the assumed molecular concentration may be reset to a value smaller than the initial value. The process of resetting the assumed molecular concentration will be described later in detail, but is performed as an optimization of the process of estimating the point of the source when searching for the point of the source in the second embodiment. As a result, search accuracy is improved.

  FIG. 5 is an example of a graph showing the relationship between the distance from the source (molecular concentration = 1 ppm) and the molecular concentration of the measurement target substance for each wind speed. As shown in FIG. 5, it can be seen that the molecular concentration of the substance to be measured decreases while approaching the molecular concentration = 0 as it goes away from the source. Also, it can be seen that the higher the wind speed, the farther the measurement target substance diffuses.

Using the graph as shown in FIG. 5, a model for calculating the estimated distance can be constructed. For example, if the estimated distance is L, the estimated distance L is assumed molecule concentration c _s of the analyte in the _source, a representative molecule concentration c _i and wind v _i in the measurement point X _{i (i} denotes a measurement time identifier) represented by a function of a parameter _{(L (c s, c i} , v i)).

Shows the estimated distance _{L (c s, c i,} v i) may be, for example, a function obtained based on known models for diffusion of the substance (diffusion model). Further, the estimated distance _{L (c s, c i,} v i) is the multiple regression analysis or the like for a plurality of performance data indicating the relationship between the distance and the molecular concentration of the analyte from such sources as shown in FIG. 5 It may be a function obtained using a statistical method. If function capable least reflect the actual phenomenon of diffusion analyte, indicating the estimated distance _{L (c s, c i,} v i) function defining a is not particularly limited.

Source point estimator 103 according to this embodiment, showing the estimated distance the above _{L (c s, c i,} v i) to a function that defines, assumed molecule concentration c _s of the analyte in the _source, measuring by substituting a representative molecule concentration c _i and wind v _i at a point X _i, can be estimated distance (estimated distance L) along the air flow from the source to the measurement point X _i.

Next, the source point estimating unit 103 estimates the source point based on the wind flow indicated by the corresponding model selected by the selecting unit 102 and the estimated distance L previously estimated. Specifically, source location estimator 103, starting from the measurement point X _i, the point going back to the windward Wind flow over only estimated distance L model is specified as point sources. Thereby, the point of the generation source can be estimated.

(Storage unit)
The storage unit 110 according to the present embodiment is realized by a storage device such as a storage. The storage unit 110 stores, for example, a program for realizing the function of each functional unit of the information processing apparatus 100. In addition, the storage unit 110 according to the present embodiment stores a plurality of simulation models related to a wind flow in a predetermined area. This simulation model is a model that is calculated in advance by the information processing device 100 or an external information processing device. In addition, the storage unit 110 stores parameters used in the source point estimation unit 103, for example, an assumed molecular concentration of the measurement target substance in the source. In addition, the storage unit 110 may sequentially acquire and store the measurement results obtained by the molecular concentration measurement device 20 and the wind direction and anemometer 30.

(Output section)
The output unit 120 according to the present embodiment has a function of outputting an output result from each functional unit included in the information processing apparatus 100. The output unit 120 is realized by, for example, an input / output device and a communication device. Further, the output unit 120 according to the present embodiment outputs a result of each process related to the representative value setting unit 101, the selection unit 102, or the source point estimation unit 103. For example, as illustrated in FIG. 3, the output unit 120 may output a measurement result obtained by the molecular concentration measurement device 20 and the wind direction anemometer, or information related to the representative value set by the representative value setting unit 101. The output unit 120 may output information on the corresponding model selected by the selection unit 102. In addition, the output unit 120 may output information on the point of the source estimated by the source point estimation unit 103.

<2.2. Processing Flow>
The configuration and functions of the substance generation source estimating apparatus 1-1 according to the first embodiment of the present invention have been described above. Next, a flow of an estimation process by the substance generation source estimation device 1-1 according to the present embodiment will be described.

  FIG. 6 is a flowchart illustrating an example of a flow of an estimation process performed by the substance generation source estimation apparatus 1-1 according to the first embodiment of the present invention. Referring to FIG. 6, in the substance generation source estimating apparatus 1-1 according to the present embodiment, first, the measurement of the molecular concentration of the measurement target substance and the measurement of the wind direction and the wind speed are performed (Step S101). Specifically, at the measurement point, the molecular concentration measuring device 20 measures the molecular concentration of the substance to be measured, and the anemometer 30 measures the wind direction and the wind speed. These measurements are performed sequentially and repeatedly.

  Next, a representative molecular concentration, a representative wind direction, and a representative wind speed are set based on a plurality of measurement results (Step S103). Specifically, the representative value setting unit 101 sets a representative value based on a plurality of measurement results at measurement points by the molecular concentration measuring device 20 and the anemometer 30.

  Next, based on the representative wind direction and the representative wind speed at the measurement point, one corresponding model is selected from the simulation models related to the wind flow in the predetermined area (Step S105). Specifically, the selecting unit 102 selects, from the plurality of simulation models acquired from the storage unit 110, a simulation model that most closely matches the wind flow including the representative wind direction and the representative wind speed at the measurement point as the corresponding model.

  Next, the point of the source of the measurement target substance is estimated using the representative molecular concentration, the representative wind speed, the assumed molecular concentration of the measurement target substance at the generation source, and the selected corresponding model (step S107). Specifically, the source point estimation unit 103 calculates an estimated distance along the wind flow from the measurement point to the source using the representative molecular concentration, the representative wind speed, and the assumed molecular concentration. Then, the source point estimation unit 103 estimates the source point by applying the estimated distance to the selected corresponding model.

<2.3. Effect>
The flow of the process performed by the substance generation source estimation device 1-1 according to the present embodiment has been described above. According to the substance source estimation device 1-1 according to the present embodiment, the process of estimating the location of the source is performed. Specifically, according to the substance generation source estimating device 1-1, a wind flow at a position corresponding to the measurement point is obtained from a representative value (representative wind direction, representative wind speed) at the measurement point set based on the measurement result. The simulation model (corresponding model) that most closely matches the representative wind direction and the representative wind speed is selected. Then, by estimating the distance along the wind flow from the measurement point to the source, and applying the distance to the selected corresponding model, the point of the source is estimated.

  According to such a configuration, the point of the generation source is estimated using a model calculated in advance for the wind flow in the predetermined area. By using a model that shows the wind flow that most closely matches the wind flow at the measurement point of the molecular concentration of the target analyte, the source of the source is determined in accordance with the wind flow that is complicated by buildings or topography that exists in the predetermined area. A point can be estimated. That is, by using the simulation model relating to the wind flow as described above, the molecular concentration and the wind flow of the measurement target substance at the measurement point can be grasped. This makes it possible to estimate the location of the source of the substance to be measured in consideration of the location of the building and the surrounding environment. Therefore, the estimation accuracy of the point of the generation source can be further improved.

<< 3. Second embodiment (search processing) >>
<3.1. Configuration and Function>
Next, a substance generation source estimation device 1-2 according to a second embodiment of the present invention will be described. The substance generation source estimating device 1-2 according to the present embodiment further includes a function relating to a search process of a generation source point, in addition to the function of the substance generation source estimating device 1-1 according to the above-described first embodiment. That is, the substance generation source estimating device 1-2 according to the present embodiment sequentially repeats the measurement of the measurement target substance and the like, the estimation of the location of the generation source, the movement, and the determination on the completion of the search for the generation source. Accordingly, the substance source estimation device 1-2 estimates the location of the source while approaching the source, so that the source can be specified more quickly. Hereinafter, an example of the configuration of the substance generation source estimation device 1-2 according to the present embodiment will be described.

  FIG. 7 is a diagram illustrating an example of a configuration of the substance generation source estimation device 1-2 according to the second embodiment of the present invention. Referring to FIG. 7, the substance generation source estimating device 1-2 according to the present embodiment has the same functions as those described above with respect to the information processing device 200, the molecular concentration measuring device 20, the anemometer 30 and the battery box 40. Therefore, the description is omitted. Hereinafter, the configuration and functions of the information processing device 200 will be described.

  As shown in FIG. 7, the information processing device 200 includes a representative value setting unit 201, a density determination unit 202, a selection unit 203, a source point estimation unit 204, a distance determination unit 205, a movement point setting unit 206, a storage unit 210, An output unit 220 is provided. Note that the functions of the representative value setting unit 201, the selection unit 203, the source point estimation unit 204, the storage unit 210, and the output unit 220 are the same as those of the representative value setting unit 101, the selection unit 102, and the first embodiment of the present invention. The functions of the source point estimation unit 103, the storage unit 110, and the output unit 120 are basically the same. The difference between the function of each functional unit according to the present embodiment and the function of each functional unit according to the first embodiment will be supplemented as appropriate in the description of the present embodiment.

(Representative value setting section)
The representative value setting unit 201 has a function related to the representative value setting unit 101 according to the first embodiment. The representative value setting unit 201 according to the present embodiment further stores the set representative value in the storage unit 210. More specifically, every time the representative value setting unit 201 performs the representative value setting process, the measurement point X _i (corresponding to the first measurement point, i is an identifier indicating the measurement time) related to the setting of the representative value is set. and the representative value (representative molecule concentration _{c i,} the representative wind direction _{D i,} the representative wind speed _{v i)} are stored in the association storing unit 210.

(Density judgment unit)
The concentration determination unit 202 has a function of determining whether the estimation of the point of the source of the measurement target substance has been completed based on the representative molecular concentration c _i at the measurement point X _i . When the concentration determination unit 202 determines that the estimation of the point of the source has been completed, the process of searching for the source by the substance source estimation apparatus 1-2 ends.

For example, the concentration determination block 202, if the representative molecule concentration c _i is the measurement of the analyte supposed molecule concentration c _s or more at the source, it may be determined that the estimation of the point source has been completed. If the representative molecule concentration c _i is assumed molecule concentration c _s or more, a higher probability of generating source in the vicinity there measurement point X _i, because it is possible to identify the source visually or known simple analyzers etc. It is.

Further, when the concentration determination unit 202 determines that the estimation of the point of the source is not completed, the search processing of the source by the substance source estimation device 1-2 is continued. In this case, the concentration determination unit 202, based on the representative molecule concentration c _i, may be changed subsequent to the contents of processing to be performed.

For example, the concentration determination section 202 alters a representative molecule concentration c _i, based on the comparison result between a representative molecule concentration c _i-1 at the measurement point X _i-1 one time before, then the contents of the processing performed You may. More specifically, when the representative molecule concentration c _i is representative molecule concentration c _i-1 or more, measured point X _i is considered to be approaching a point of origin. Therefore, the concentration determination unit 202, a subsequent processing, by using the set representative value or the like by the representative value setting unit 201 may be instructed to perform an estimation process of the point sources in the measurement point X _i. In this case, the process related to the selection unit 203 is executed as the next process of the density determination unit 202. On the other hand, when the representative molecule concentration c _i is less than typical molecular concentration c _i-1, is considered a measurement point X _i is moving away from the source. Therefore, as a subsequent process, the density determination unit 202 may instruct to return to the direction of the measurement point Xi _-1 . In this case, a process related to the moving point setting unit 206 is executed as the next process of the density determination unit 202.

The determination process using a representative molecule concentration c _i by the density determination unit 202 is not limited to the examples described above. For example, the concentration determination unit 202, when the representative molecule concentration c _i is less than typical molecular concentration c _i-1 is also a subsequent processing, by using the set representative value or the like by the representative value setting unit 201, the measurement it may be instructed to perform an estimation process of point sources at a point X _i. For example, if the representative molecule concentration c _i is less than greater than the representative molecule concentration c _i-1, the mobile will past the point sources by, located upwind direction than the point of measurement point X _i is a source Can be considered. In such a case, the density determination unit 202 determines whether or not the measurement result has returned to the original level, as described in a later-described moving point setting unit 206.

The representative molecule concentration c _i is the case where assumed molecule concentration c _s or more, it is determined that the estimation of the point sources by the density determination unit 202 has been completed. However, if the source cannot be specified after the determination, the process by the substance source estimation device 1-2 may be restarted. At this time, the value of the assumed molecular concentrations c _s may be re-set to a higher value. For example, the value of the assumed molecule concentration c _s may be reset to a value higher than the representative molecule concentration c _i . Thereby, the search processing of the point of the generation source by the substance generation source estimation device 1-2 can be further advanced.

The representative molecules if the concentration c _i is a determination based on less than typical molecular concentration c _i-1 is carried out frequently by the density determination unit 202, measured in the set value is the actual source of the assumed molecular concentrations c _s There is a possibility that the concentration is higher than the molecular concentration of the target substance. If the difference between the representative molecular concentration c _i and the assumed molecular concentration c _s is not reduced even though the process of repeatedly searching for the point of the generation source is performed, the set value of the assumed molecular concentration c _s is set to the actual value. There is a possibility that it is higher than the molecular concentration of the analyte at the source. In this case, it is preferable to further re-set low value of the assumed molecular concentrations c _s. The process related to the resetting can be performed at an appropriate time in the determination process by the density determination unit 202. For example, determination processing by the concentration determination block 202, if the time search process starts exceeds a predetermined number, it may be made processing according to the resetting of the set value of the assumed molecular concentrations c _s.

Note that the representative molecule concentration c _i-1 and the assumed molecule concentration c _s at the measurement point X _i-1 are acquired from the storage unit 210.

(Selection section)
The selection unit 203 has a function related to the selection unit 102 according to the first embodiment. Selecting unit 203 according to this embodiment selects a corresponding model showing representative wind direction D _i at the measuring point X _i, wind flow corresponding to the representative wind speed v _i.

(Source point estimation unit)
The source point estimating unit 204 has a function related to the source point estimating unit 103 according to the first embodiment. Source point estimator 204 according to this embodiment, the representative molecule concentration c _i and the representative wind speed v _i in the measurement point X _i, assumed molecule concentration c _s of the measurement object substance at the _source, as well as selected by the selection unit 203 Using the corresponding model, the location of the source is estimated. Specifically, source location estimator 204 first representative molecule concentration c _i, the representative wind speed v _i and with an assumed molecular concentrations c _s, distance along the wind flow to the point of origin from the measurement site ( (Estimated distance). The estimated distance is estimated distance _{L (c s, c i,} v i) is expressed as.

The source location estimator 204, starting from the measurement point X _i, the point going back to the windward Wind flow over only estimated distance L model is specified as point sources.

(Distance determination unit)
The distance determination unit 205 determines whether the estimation of the point of the source of the measurement target substance is completed based on the distance between the measurement point and the point of the source (estimated source) estimated by the source point estimation unit 204. It has a function to determine whether or not it is. When the distance determination unit 205 determines that the estimation of the point of the source has been completed, the search processing of the source by the substance source estimation device 1-2 ends.

For example, the distance determination unit 205, when the distance between the measuring location X _i and the estimated source is a predetermined distance or less, it may be determined that the estimation of the point source has been completed. This is because if the predetermined distance is sufficiently short, the source can be identified visually or by a known simple analyzer. On the other hand, when the distance determination unit 205 determines that the estimation of the point of the generation source is not completed, the search processing of the generation source by the substance generation source estimation device 1-2 is continued.

Here, the distance between the measuring location X _i and the estimated source may be, for example, an estimated distance L estimated by the source location estimator 204. The distance between measuring points X _i and the estimated source may be a linear distance between the measuring location X _i and the estimated source. Whether to use the former or the latter for the determination processing in the distance determination unit 205 may be determined according to, for example, a building or a terrain in a predetermined area. Specifically, when many buildings are provided in the above-mentioned predetermined area, it is considered that the wind current is shielded or meandered by the buildings. In this case, as the distance between the measuring location X _i and the estimated source, estimated distance L is preferably used. On the other hand, building the predetermined area can not be so provided, if the predetermined region is a good region sight, as the distance between the measuring location X _i and the estimated source, the measuring point X _i and the estimated source A straight distance may be used.

In the present embodiment determines, for example, the estimated distance L is equal to or less than the predetermined distance R _s, the distance determination unit 205 completes the estimation of the point sources. On the other hand, when the estimated distance L is greater than a predetermined distance R _s, the distance determination unit 205 determines that the estimation of the location of the sources is not completed, the process of searching for source by a substance source estimation apparatus 1-2 Perform processing to continue. The predetermined distance R _s are, for example, a gas inlet pipe 21 of the molecular concentration measuring device 20 are possible stretching, real-time introduction time until gas introduced from the gas introduction pipe 21 to reach the molecular concentration measurement device 20 of It is preferable that the distance is such that the distance is not impaired. For example, if the deployment time is within 1 second, the predetermined distance R _s is about 5 m. Also, if you want further shorten the duration of the introduction, it is preferable to set shorter the predetermined distance R _s. The predetermined distance _{R s} is obtained from the storage unit 210.

(Move point setting section)
The moving point setting unit 206 sets a new measurement point (moving point) according to the determination result by the density determining unit 202 or the distance determining unit 205. Moving point setting unit 206, for example, moving the point X _{i + 1 (second} measurement based on the air flow at the measurement point X _i (representative wind direction D _i and the representative wind speed v wind flow shown in corresponding models selected on the basis of _i) (Corresponding to a point).

For example, the moving point setting unit 206, the air flow at the measurement point _{X i,} sets the movement point _{X i + 1} in the windward direction than the measurement point _{X i.} Moving the point X _{i + 1} is set from the measurement point X _i upwind direction by a predetermined moving distance. The predetermined moving distance may be set, for example, according to the length of either the long side or the short side of the predetermined area. Further, the predetermined moving distance may be a distance to a point where the wind direction or the wind speed can change in the windward direction of the wind flow on the corresponding model.

FIG. 8 is a diagram for explaining an example of a method of setting a moving distance from a measurement point to a moving point. As shown in FIG. 8, it is assumed that the substance generation source estimation device 1-2 is located on a part of a road surrounded by buildings and the like in a predetermined area, and the generation source S1 is at a point indicated by an X mark in the drawing. I do. In this case, material source estimating apparatus 1-2, as indicated by an arrow _{R i,} by going back wind flow W1, W2, W4 and W6, can reach the source S1. However, for example, as shown in FIG. 8, at the intersection C1, the wind flows W2 and W3 may merge. That is, the intersection C1 is considered to be a point where the wind flow is likely to change. Therefore, the movement point setting unit 206 can estimate that the generation source S1 may be present in the windward direction of the wind flow W1 at the measurement point, but the measurement target substances released from the generation source S1 are not included in the wind flows W2 and W3. There may be cases where it is difficult to correctly estimate whether the flow has flown on any of them.

  Therefore, the moving point setting unit 206 can set the intersection C1 where the wind flow is likely to change as the next moving point. Thereby, at the intersection C1, the point of the generation source is estimated again. Then, since the measurement target substance released from the generation source S1 can be estimated to be flowing from the wind flow W2, the next moving point can be set in the windward direction of the wind flow W2. By repeating this at the intersections C2 and C3, it is possible to reliably reach the generation source S1.

The moving point setting unit 206, and the point of estimated by the source location estimator 204 source, based on the measurement site X _i, may be set to move the point X _{i + 1.} For example, the moving point setting unit 206 may set the estimated source point as the moving point Xi _{+ 1} . As a result, it is possible to quickly approach the point of the source, so that the time required for the process of searching for the source can be reduced. The moving point setting unit 206, any point between the point of the estimated source and the measurement point X _i (e.g. waypoint), may be set as the moving point X _{i + 1.} Thereby, it is possible to reliably approach the point of the source while taking into account the influence of an estimation error that may be caused by the estimation process performed by the source point estimating unit 204.

The method of setting the moving point Xi _{+ 1} by the moving point setting unit 206 described above is not limited to the above-described example, and is not particularly limited as long as it is possible to approach the estimated source point. In addition, the above-described setting method may be appropriately changed according to the state of the search process performed by the substance generation source estimation device 1-2. For example, in the initial stage of the search processing, the movement distance to the movement point X _{i + 1} may be set relatively large, and as the search processing proceeds and the distance to the estimated source point approaches, the movement distance increases. It may be set small. The moving point setting unit 206 appropriately sets the moving point Xi _{+ 1 so} as to have a moving distance according to the measurement point Xi and the point of the estimated source at the time of executing the search processing, or the state of the search processing. Is preferred.

Moreover, if the representative molecule concentration _{c i} at the measuring point _{X i} in the concentration determination unit 202 is determined to fall below a representative molecule concentration _{c i-1} at the measurement point _{X i-1} one time before, the moving point setting unit 206 It is preferable to set a next moving point X _{i + 1} (corresponding to a third measuring point) in the leeward direction of the measuring point X _i in the wind flow at the measuring point X _i-1 . If the representative molecule concentration c _i is less than the typical molecular concentration c _i-1, the position of the mobile from the measurement point X _i-1 to the measuring point X _i is either a moving away from the point of origin or source, It is possible that this is a movement that passes by. Further, depending on the case, there is also a case where it moves to the windward side of the point of the generation source. Therefore, there is a possibility that it is difficult to continue the process of searching for the generation source.

In the case described above, the measurement point X _i is located upwind wind direction flow at the measurement point X _i-1. Therefore, the moving point setting unit 206 sets the moving point X _{i + 1} in the wind direction at the measuring point X _i−1 in the leeward direction from the measuring point X _i . For example, the moving point setting unit 206 may set the measuring point Xi _-1 as the moving point Xi _{+ 1} . This makes it possible to position the measurement point again on the leeward side of the source even when the distance from the source is away. The moving point setting unit 206 may set any point between the measurement points X _i and the measurement point X _i-1 as the mobile point X _{i + 1.}

If the representative molecule concentration c _i is well below the typical molecular concentration c _i-1, as described above, material source estimating apparatus 1-2 will past the point sources by the movement, material source estimating apparatus 1 2 may be located on the windward side of the source. In this case, the moving point setting unit 206, to the representative molecule concentration c _i at the concentration determination unit 202 is determined to have returned to the level of the original molecule concentration, the moving point x _{i + 1} in the downwind direction than appropriate measurement point x _i You may continue to set.

Incidentally, in the case where the representative molecules concentration c _i is less than the typical molecular concentration c _i-1, the moving point setting unit 206, in addition to set the moving points X _{i + 1} in the downwind direction, the wind flow at the measurement point X _i or estimated, may be set to move the point X _{i + 1} based on the point has been the source and measurement point X _i. This setting method is effective in measuring point X _i is away from the point sources.

Information about the moving point X _{i + 1} set by the moving point setting unit 206 is output to the storage unit 210 and the output unit 220 as appropriate.

(Storage unit / output unit)
The substance generation source estimation device 1-2 according to the present embodiment includes a series of processes related to the representative value setting unit 201, the concentration determination unit 202, the selection unit 203, the source point estimation unit 204, the distance determination unit 205, and the movement point setting unit 206. Is repeated as appropriate as a search process. Information used for the search processing is appropriately acquired from the storage unit 210, and information obtained by the search processing is appropriately output to the storage unit 210 or the output unit 220.

The storage unit 210 according to the present embodiment has the function of the storage unit 110 according to the above embodiment. The storage unit 210 according to the present embodiment appropriately stores, for example, the representative value set by the representative value setting unit 201 and the information related to the moving point Xi _{+ 1} set by the moving point setting unit 206. In addition, the storage unit 210 appropriately outputs information (assumed molecular concentration c _s , past representative value, and the like) used in each determination process to the concentration determination unit 202 and the distance determination unit 205.

The output unit 220 according to the present embodiment has the function of the output unit 120 according to the above embodiment. The output unit 220 outputs a result of a series of search processing. For example, the output unit 220 may output a determination result by the density determination unit 202 and the distance determination unit 205. Further, the moving point setting unit 206 may output information relating to the set moving point X _{i + 1} . Further, when the vehicle 2 of the substance generation source estimating device 1-2 is movable by automatic control, the output unit 220 outputs information on the traveling point Xi _{+ 1} to a control device or the like that controls the traveling of the vehicle 2 or the like. Is also good. Thereby, the vehicle 2 can autonomously move to the movement point Xi _{+ 1} .

<3.2. Processing Flow>
The configuration and functions of the substance generation source estimation device 1-2 according to the second embodiment of the present invention have been described above. Next, a flow of a search process by the substance generation source estimation device 1-2 according to the present embodiment will be described.

FIG. 9 is a flowchart illustrating an example of a flow of a search process performed by the substance generation source estimation device 1-2 according to the second embodiment of the present invention. Referring to FIG. 9, the material source estimating apparatus 1-2 according to the present embodiment, first, measurement of the molecular concentration of the analyte in the measuring point X _i, and measurement of wind direction and wind speed is performed (step S201) . Specifically, at the measurement point, the molecular concentration measuring device 20 measures the molecular concentration of the substance to be measured, and the anemometer 30 measures the wind direction and the wind speed. These measurements are performed sequentially and repeatedly.

In the case where the search process is performed for the first time, the measurement point X ₁ is preferably carried out at a point as shown in FIG. 10. Figure 10 is a diagram for explaining a point recommended as measuring location X ₁ in the first search processing. The thick frame shown in FIG. 10 corresponds to the measurement target area (predetermined area) RA. It is assumed that the source S2 exists in the measurement area RA.

First, as the measurement point X _1, it is preferred analyte in the outer peripheral region SA1 of the measurement target area RA is a point to be detected. The substance generation source estimation device 1-2 according to the present embodiment is a technique for preventing leakage of a measurement target substance to the outside of the measurement target area RA. Therefore, if a measurement target substance is detected in the outer peripheral area SA1, there is a high probability that the measurement target substance has leaked to the outside. Therefore, the point where the analyte is detected in the outer peripheral region SA1, it is preferable to set as a measurement point X ₁ in the search process for the first time.

Further, as the measurement point X _1, it is preferably a point included in the central area SA2 of the measurement target area RA. This is because the accessibility to the source S2 is highest when the location of the source S2 is unknown.

Further, as the measurement point X _1, it is preferably a point included in the leeward side of the area SA3 of the measurement target area RA. This is because the measurement target substance released from the generation source S2 flows downwind as a whole, so that the measurement target substance is easily detected in the area SA3.

  In addition, when the measurement target substance is not detected in the above-described areas SA1 to SA3, the substance generation source estimation device 1-2 continues the measurement at an arbitrary point in the measurement target area until the measurement target substance is detected.

Referring again to FIG. 9, then, based on the plurality of measurements, a representative molecule concentration _{c i,} the representative wind direction _{D i} and the representative wind speed _{v i} is set (step S203). Specifically, the representative value setting unit 201 sets a representative value based on a plurality of measurement results at measurement points by the molecular concentration measuring device 20 and the anemometer 30.

Then, determination is made based on a comparison of the assumed molecular concentration _{c s} a representative molecule concentration _{c i} (step S205). Specifically, the concentration determination unit 202 compares the magnitudes of the assumed molecular concentration c _s a representative molecule concentration c _i. If the representative molecule concentration _{c i} is assumed molecule concentration _{c s} or more (S205 / YES), the concentration determination unit 202 determines to end the search process (step S207). However, as described above, when it is not possible to identify the source after the search process ends, with modifications assumptions molecule concentration c _s, may be re-searching process is restarted. On the other hand, if the representative molecule concentration _{c i} is less than the assumed molecular concentrations _{c s} (S205 / NO), determination is line based on a comparison of a representative molecule concentration _{c i-1} at the representative molecule concentration _{c i} measuring location _{X i-1} Is performed (step S209). Specifically, the concentration determination unit 202 compares the magnitudes of the representative molecule concentration c _i-1 representative molecule concentration c _i.

If the representative molecule concentration _{c i} is less than the typical molecular concentration _{c i-1} at step S209 (S209 / YES), a moving point _{X i + 1,} is set in the downwind direction of the measurement site _{X i} (step S211). Specifically, the concentration determining unit 202 outputs the determination result to the moving point setting unit 206, and the moving point setting unit 206 determines that the wind flow at the measuring point X _i-1 is more leeward than the measuring point X _i . A moving point Xi _{+ 1} is set. In this case, the processes related to the selection unit 203, the source point estimation unit 204, and the distance determination unit 205 are not performed, and the process according to step S201 is performed again after the substance source estimation device 1-2 moves to the movement point Xi _{+ 1.} Done.

On the other hand, when the representative molecule concentration _{c i} at step S209 is representative molecule concentration _{c i-1} or more (S209 / NO), the corresponding model showing the air flow in the measurement point _{X i} is selected (step S213). More specifically, the selection unit 203, a plurality of simulation models acquired from the storage unit 110, a representative wind direction D _i and simulation models that best matches the wind stream consisting representative wind speed v _i in the measurement point X _i as the corresponding model select.

Next, the point of the source of the measurement target substance is estimated (step S215). Specifically, source location estimator 204, a representative molecule concentration c _i, the representative wind speed v _i, using the corresponding model selected in supposition molecule concentration c _s, and selecting section 203 estimates the point sources . More specifically, source location estimator 204, a representative molecule concentration c _i, the representative wind speed v _i and the estimated molecular concentrations c _s estimated distance along the air flow from the measurement point X _i to the source with L By calculating _i and applying the estimated distance L _i to the selected corresponding model, the point of the source is estimated.

Then, a measurement point X _i, based on the distance between the point of the estimated source, whether the estimation of the point source of the analyte has been completed is determined (step S217). Specifically, the distance determination unit 205 _(the distance between the or measurement point X _i as a source) the estimated distance L _i is based on or less than a predetermined distance R _s, sources point Determine whether the estimation is complete. If the estimated distance _{L i} is equal to or less than the predetermined distance _{R s} (S217 / YES), the concentration determination unit 202 determines to end the search process (step S219).

On the other hand, the estimated distance _{L i} in step S217 if above a predetermined distance _{R s} (S217 / NO), it moves the point _{X i + 1} is set (step S221). Specifically, the mobile point setting unit 206, based on the wind flow, such as at the measurement point X _i, sets the movement point X _{i + 1.} Then, the substance generation source estimation device 1-2 moves to the set moving point Xi _{+ 1} by traveling by the vehicle 2 (step S223). After that, the process of step S101 is performed again. The substance generation source estimation device 1-2 according to the present embodiment repeatedly performs a search process as illustrated in FIG. 9 until it is determined that the process is to be ended.

<3.3. Effect>
The flow of the process performed by the substance generation source estimation device 1-2 according to the present embodiment has been described above. According to the substance source estimation device 1-2 according to the present embodiment, a search process for further arriving at the point of the source is performed using the estimation process according to the first embodiment of the present invention. Specifically, according to the substance source estimation device 1-2, the determination as to the continuation or termination of the search process is performed using the molecular concentration at the measurement point or the point of the source or the distance between the two points, Then, the measurement point is sequentially moved using the wind flow indicated by the corresponding model or the estimation result of the point of the generation source.

  According to this configuration, the substance source estimation device 1-2 estimates the location of the source for each measurement, moves for searching based on the estimation result, and the like, and after the movement, the estimation process and the search process are executed again. You. As a result, it is possible not only to estimate the point of the source, but also to approach the point of the source that is actually releasing the substance to be measured. Therefore, it is possible to more reliably and efficiently search for the point of the source of the substance to be measured in consideration of the location of the building and the surrounding environment.

<< 4. Hardware configuration diagram >>
Next, a hardware configuration of the information processing apparatus according to the above embodiment will be described with reference to FIG. FIG. 11 is a block diagram illustrating an example of a hardware configuration of the information processing apparatus according to the embodiment of the present invention. The hardware configuration shown in FIG. 11 can configure the information processing apparatus 10 (100, 200) shown in FIGS. 1, 2, and 7.

  Referring to FIG. 11, the information processing apparatus 900 mainly includes a CPU 901, a ROM 903, and a RAM 905. The information processing device 900 further includes an input device 909, an output device 911, a storage device 913, a drive 915, a connection port 917, which are connected to the CPU 901, the ROM 903, and the RAM 905 via the bus 907. And an apparatus 919.

  The CPU 901 functions as an arithmetic processing device and a control device, and controls the entire operation or a part of the operation in the information processing device 900 according to various programs recorded in the ROM 903, the RAM 905, the storage device 913, or the removable recording medium 921. The ROM 903 stores programs used by the CPU 901 and operation parameters. The RAM 905 temporarily stores a program used by the CPU 901, parameters that appropriately change in execution of the program, and the like. These are interconnected by a bus 907 constituted by an internal bus such as a CPU bus. In the above embodiment, the CPU 901 can constitute each functional unit of the information processing device 100 shown in FIG. 2 and the information processing device 200 shown in FIG.

  The input device 909 is an operation unit operated by an operator, such as a mouse, a keyboard, a touch panel, a button, a switch, and a lever. The input device 909 may be, for example, a remote control unit (so-called remote controller) using infrared rays or other radio waves, or an externally connected device 923 such as a PDA corresponding to the operation of the information processing device 900. You may. Further, the input device 909 includes, for example, an input control circuit that generates an input signal based on information input by the operator using the above-described operation means and outputs the input signal to the CPU 901. By operating the input device 909, the operator of the information processing device 900 can input various data to the information processing device 900 and instruct a processing operation.

  The output device 911 is configured to be a device capable of visually or audibly notifying the worker of the acquired information. Such devices include CRT display devices, liquid crystal display devices, plasma display devices, display devices such as EL display devices and lamps, audio output devices such as speakers and headphones, printer devices, mobile phones, facsimile machines, and the like. The output device 911 outputs, for example, results obtained by various processes performed by the information processing device 900. Specifically, the display device displays results obtained by various processes performed by the information processing device 900 as text or images. The audio output device converts an audio signal including reproduced audio data and acoustic data into an analog signal and outputs the analog signal. In the above embodiment, the output device 911 can constitute part or all of the output unit 120 shown in FIG. 2 and the output unit 220 shown in FIG.

  The storage device 913 is a data storage device configured as an example of a storage unit of the information processing device 900. The storage device 913 includes, for example, a magnetic storage unit device such as a hard disk drive (HDD), a semiconductor storage device, an optical storage device, or a magneto-optical storage device. The storage device 913 stores programs executed by the CPU 901, various data processed by the CPU 901, various data acquired from the outside, and the like. In the above embodiment, the storage device 913 can constitute the storage unit 110 shown in FIG. 2 and the storage unit 210 shown in FIG.

  The drive 915 is a reader / writer for a recording medium, and is built in or external to the information processing apparatus 900. The information processing device 900 can acquire various types of information recorded on the removable recording medium 921 via the drive 915. In addition, the information processing apparatus 900 can record various types of information on the removable recording medium 921 via the drive 915. The removable recording medium 921 is various media such as a magnetic disk, an optical disk, a magneto-optical disk, and a semiconductor memory. For example, the removable recording medium 921 is a CD medium, a DVD medium, a Blu-ray (registered trademark) medium, or the like. Further, the removable recording medium 921 may be a compact flash (registered trademark) (CompactFlash: CF), a flash memory, an SD memory card (Secure Digital memory card), or the like. The removable recording medium 921 may be, for example, an IC card (Integrated Circuit card) on which a non-contact type IC chip is mounted, an electronic device, or the like.

  The connection port 917 is a port for directly connecting a device to the information processing device 900. Examples of the connection port 917 include a USB (Universal Serial Bus) port, an IEEE1394 port, a SCSI (Small Computer System Interface) port, and an RS-232C port. By connecting the externally connected device 923 to the connection port 917, the information processing apparatus 900 acquires various data from the externally connected device 923 via the connection port 917, and transmits various data to the externally connected device 923. Or can be provided. In the above embodiment, for example, the information processing device 100 shown in FIG. 2 and the information processing device 200 shown in FIG. 7 acquire measurement data from the molecular concentration measurement device 20 and the anemometer 30 via the connection port 917. obtain. The output unit 220 shown in FIG. 7 can be connected to the control device of the vehicle 2 via the connection port 917.

  The communication device 919 is a communication interface including, for example, a communication device for connecting to the communication network 925. The communication device 919 is, for example, a communication card for a wired or wireless LAN (Local Area Network), Bluetooth (registered trademark), or WUSB (Wireless USB). The communication device 919 may be a router for optical communication, a router for ADSL (Asymmetric Digital Subscriber Line), a modem for various communication, or the like. The communication device 919 can transmit and receive signals and the like to and from the Internet and other communication devices in accordance with a predetermined protocol such as TCP / IP. Further, the communication network 925 connected to the communication device 919 is configured by a network or the like connected by wire or wirelessly, and may be, for example, the Internet, a home LAN, infrared communication, radio wave communication, satellite communication, or the like. . The information processing device 900 can receive various information from an external device connected via the communication network 925 by the communication device 919. In addition, the information processing device 900 can transmit various types of information to an external device connected via the communication network 925 by the communication device 919. In the above embodiment, for example, the information processing device 100 shown in FIG. 2 and the information processing device 200 shown in FIG. 7 are transmitted from the molecular concentration measuring device 20 and the wind direction anemometer 30 by the communication device 919 via the communication network 925. Measurement data can be obtained. The output unit 220 illustrated in FIG. 7 can be connected to the control device of the vehicle 2 by a communication device 919 via a communication network 925.

  The example of the hardware configuration of the information processing apparatus 900 according to the present embodiment has been described above with reference to FIG.

<< 5. Summary >>
As described above, the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those skilled in the art to which the present invention pertains can conceive various changes or modifications within the scope of the technical idea described in the claims. It is understood that these also belong to the technical scope of the present invention.

  For example, the substance source estimating apparatus 1 according to the above embodiment estimates the point of the source emitting the target substance using the measurement result of the molecular concentration of the target substance contained in the atmospheric gas. Is not limited to such an example. For example, the substance source estimation device may estimate the location of the source of the substance to be measured in an internal space of a building structure or an underground space such as a tunnel.

  In addition, the target substance to be measured by the molecular concentration measuring device 20 according to the above embodiment is an aromatic molecule, but the present invention is not limited to this example. In another embodiment, the substance to be measured is not particularly limited as long as the molecular concentration can be measured by the molecular concentration measuring device 20.

  The configurations shown in FIGS. 1, 2 and 7 are merely examples of the substance generation source estimation device 1 according to the present embodiment, and the specific configuration of the substance generation source estimation device 1 is not limited to such an example. The substance generation source estimating apparatus may be configured to be able to implement the substance generation source estimating method according to the present embodiment described above, and may take any configuration that can be generally assumed. For example, the substance generation source estimating apparatus 1 according to the above-described embodiment does not necessarily have to load the information processing apparatus 10 and the like on the vehicle 2 when only estimating the point of the generation source.

REFERENCE SIGNS LIST 1 substance generation source estimation device 2 vehicle 10 (100, 200) information processing device 20 molecular concentration measurement device 21 gas introduction pipe 30 wind direction anemometer 40 battery box 101 representative value setting unit 102 selection unit 103 generation source point estimation unit 110 storage unit Reference Signs List 120 output unit 201 representative value setting unit 202 density determination unit 203 selection unit 204 source point estimation unit 205 distance determination unit 206 moving point setting unit 210 storage unit 220 output unit

Claims (13)

A substance source estimation method for estimating a point of a source of a substance to be measured,
A measuring step of sequentially measuring a molecular concentration, a wind direction and a wind speed of the substance to be measured at a first measurement point;
Based on the measured molecular concentration, the wind direction and the wind speed, a representative value setting step of setting a representative molecular concentration, a representative wind direction and a representative wind speed of the substance to be measured at the first measurement point,
A corresponding model showing the wind flow corresponding to the representative wind direction and the representative wind speed at the first measurement point set in the representative value setting step from a plurality of simulation models related to the wind flow in a predetermined region calculated in advance. A model selection step of selecting
A source point for estimating a point of the source based on the selected corresponding model, the representative molecular concentration and the representative wind speed at the first measurement point, and an assumed molecular concentration of the measurement target substance at the source; and the estimation step, only including,
In the representative value setting step, among the measurement results measured in the measurement step, based on the measurement result when the molecular concentration of the measurement target substance shows a predetermined reference value or more, the representative of the measurement target substance The molecular concentration, the representative wind direction and the representative wind speed are set,
Material source estimation method.   The substance source estimation method according to claim 1, further comprising a concentration determination step of determining whether estimation of the point of the source is completed based on the representative molecular concentration at the first measurement point.   The substance generation source estimation method according to claim 2, wherein in the concentration determination step, when the representative molecular concentration at the first measurement point is equal to or higher than the assumed molecular concentration, it is determined that the estimation of the generation source is completed. When it is determined in the concentration determination step that the estimation of the point of the source is not completed,
The substance generation source estimating method according to claim 2 or 3, further comprising a second measurement point setting step of setting a second measurement point based on the wind flow at the first measurement point.   The said 2nd measurement point is the wind direction in the said 1st measurement point which the said corresponding model selected in the said model selection step shows, and is set in the windward direction from the said 1st measurement point, Substance source estimation method as described.   The second measurement point is set based on the point of the source estimated using the wind flow at the first measurement point in the source point estimation step, and the first measurement point, The method for estimating a substance generation source according to claim 4.   The substance source estimation method according to claim 6, wherein the second measurement point is set to the point of the source estimated in the source point estimation step. In the concentration determination step, when it is determined that the estimation of the point of the source is not completed by the representative molecule concentration at the second measurement point is lower than the representative molecule concentration at the first measurement point,
The method further includes a third measurement point setting step of setting a third measurement point in the wind direction at the first measurement point indicated by the corresponding model acquired in the model selection step, in a direction more leeward than the second measurement point. The substance generation source estimating method according to any one of claims 4 to 7. If the distance between the point of the source estimated in the source point estimating step and the first measurement point is equal to or less than a predetermined distance, the method further includes a distance determination step of determining that the estimation of the source is completed. The substance generation source estimation method according to claim 1 . Wherein the measurement step, one-photon ionization mass spectrometry: by (Single Photon Ionization-Mass Spectrometry SPI -MS) measuring apparatus using a molecular concentration of the analyte is measured, claim 1-9 2. The method for estimating a substance generation source according to claim 1. Wherein the measurement step, by Anemometer two-dimensional wave equation, wind direction and wind speed are measured at the measurement point, material source estimation method according to any one of claims 1-10. The method according to any one of claims 1 to 11 , wherein the point of the source is sequentially estimated while moving by a vehicle. A substance generation source estimating apparatus for sequentially estimating a point of a source of a measurement target substance,
A molecular concentration measuring device that sequentially measures the molecular concentration of the target substance at the measurement point,
An anemometer that measures the wind direction and wind speed at the measurement point sequentially,
A setting unit that sets a representative molecular concentration, a representative wind direction, and a representative wind speed of the measurement target substance at the measurement point based on the measured molecular concentration, the wind direction, and the wind speed,
A storage unit that stores a plurality of simulation models related to a wind flow in a predetermined region calculated in advance,
From the plurality of simulation models stored in the storage unit, a selection unit that selects a corresponding model indicating the wind flow corresponding to the representative wind direction and the representative wind speed at the measurement point set by the setting unit,
The selected correspondence model, the representative molecular concentration and the representative wind speed at the measurement point, and a source point estimating unit that estimates the point of the source based on an assumed molecular concentration of the measurement target substance at the source. and, the Bei example,
The setting unit is configured to perform the measurement based on a measurement result when the molecular concentration of the substance to be measured indicates a predetermined reference value or more among the measurement results measured by the molecular concentration measurement device and the anemometer. Setting the representative molecular concentration of the target substance, the representative wind direction and the representative wind speed,
Substance source estimation device.

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