JP5555434B2 - Concentration measuring device - Google Patents

Description

  The present invention relates to a concentration measuring apparatus that measures the concentration of a predetermined gas such as carbon dioxide.

  For example, a so-called radiosonde is used as a concentration measuring device that includes a balloon floating in the air and measures the concentration of a predetermined gas such as carbon dioxide. This type of so-called radiosonde includes a concentration measuring device that measures the concentration of a predetermined gas in the atmosphere filled with the atmosphere, an atmosphere introduction section that guides the atmosphere in the atmosphere to the concentration measuring device, and the concentration A transmitter that transmits the predetermined gas concentration measured by the measuring device toward the ground station, a storage box that stores the concentration measuring device, an atmosphere introduction unit, a transmitter, and the like, and is attached to the storage box. And a balloon for floating the storage box in the air.

  Once the radiosonde described above is released into the air, while the power can be supplied from the power source to the transmitter, the concentration measuring device described above continues to measure the concentration of the predetermined gas and performs the measurement. Continue to send information indicating the gas concentration and so on toward the ground station. For this reason, once a radiosonde is released into the air, it does not receive any maintenance from workers.

  The above-mentioned conventional radiosonde, once released into the air, is not subject to any maintenance by workers, etc., so that the predetermined gas measured by the concentration meter with the passage of time of use is used. The concentration error gradually increased, and finally, it was difficult to accurately measure the aforementioned predetermined gas concentration.

  Therefore, an object of the present invention is to be able to accurately measure a predetermined gas concentration measured by a concentration measuring device even when a usage time has elapsed.

The invention according to claim 1, which has been made in order to solve the above-described problems, is a concentration measuring device that measures the concentration of a predetermined gas in the atmosphere filled with the atmosphere, and measures the concentration of the atmosphere in the atmosphere. A first state for guiding the atmosphere directly to the concentration measuring device; an atmosphere introducing portion for leading to the vessel; a removing means for removing the predetermined gas from the atmosphere introduced by the atmosphere introducing portion; Switching means capable of switching the atmosphere to a second state leading to the concentration measuring device via the removing means, and switching the switching means between the second state and the first state, Based on the predetermined gas concentration at the second state measured by the concentration measuring device, the predetermined gas concentration at the first state measured by the concentration measuring device. Control means to correct The concentration measuring device includes a light emitting unit that emits light and a plurality of light receiving units that include transmission members that transmit the light having different wavelengths, and the control unit includes: The switching means is further switched between the second state and the first state, and further includes a reference gas storage portion for storing a gas containing a predetermined concentration of the predetermined gas. However, it is possible to switch the atmosphere introduction part to the first state, the second state, and the third state for guiding the gas in the reference gas storage part to the concentration measuring device, and the control means The switching means is switched to the second state, the first state, and the third state, and the concentration of the predetermined gas in the second state measured by the concentration measuring device is Of the third state measured by the concentration meter. Divided by the predetermined gas concentration and multiplied by the actual gas concentration in the third state, the first state measured by the concentration meter The predetermined gas concentration at the time is corrected .

According to a second aspect of the present invention, in the first aspect of the invention, the control unit switches the switching unit between the second state and the first state alternately a predetermined number of times. Later, the switching means is switched to the third state.

The invention described in claim 3 is characterized in that, in the invention of claim 1 or 2 , a heat insulating tank made of a heat insulating material and covering the concentration measuring device is provided.

The invention according to claim 4 is the invention according to any one of claims 1 to 3 , wherein a storage box containing at least the concentration measuring device, and a balloon for floating the storage box in the air, And a transmitter for transmitting information indicating the concentration of the predetermined gas after correction calculated by the control means.

The invention according to claim 5 is characterized in that, in the invention according to claim 4 , the storage box 3 is formed of a heat insulating material.

  As described above, according to the first aspect of the invention, the first state in which the atmosphere in the atmosphere is directly guided to the concentration measuring device by the switching means, and the atmosphere measuring device in the concentration measuring device through the removing means. By switching between the second state to be led, the concentration of a predetermined gas in the atmosphere is measured. For this reason, the aforementioned predetermined gas concentration in an atmosphere that does not contain any predetermined predetermined gas, that is, the aforementioned predetermined gas concentration in an atmosphere in which the predetermined gas concentration is zero, and the atmospheric atmosphere Even if the error in the measurement result of the concentration measuring instrument increases with the usage time, the influence of the error is removed and the usage time elapses. The concentration of the aforementioned predetermined gas in the atmosphere can be accurately measured.

Further, since the switching means alternately switches between the second state and the first state and measures the concentration of the predetermined gas in the atmosphere, the atmosphere does not contain any predetermined gas at all. Alternately measuring the above-mentioned predetermined gas concentration, that is, the above-mentioned predetermined gas concentration of the atmosphere in which the predetermined gas concentration is zero, and the above-mentioned predetermined gas concentration of the atmosphere in the atmosphere. Even if the error in the measurement result of the concentration meter increases with the usage time, the influence of the error is removed, and the concentration of the specified gas in the atmosphere is measured more accurately even after the usage time has elapsed. can do.

In addition, the switching unit causes the second state described above, the first state, and a third state in which a gas containing a predetermined concentration of the predetermined gas in the gas storage unit is guided to the concentration measuring device. And the concentration of a predetermined gas in the atmosphere is measured. For this reason, the concentration of the predetermined gas described above in the atmosphere where the concentration of the predetermined gas is zero, the concentration of the predetermined gas described above in the atmosphere in the atmosphere, and the predetermined gas includes the predetermined concentration. The measurement will be performed by switching between the above-mentioned predetermined gas concentration of the gas, and even if the error in the measurement result of the concentration meter increases with the usage time, the influence of the error will be removed and the usage time will elapse. Even so, the concentration of the predetermined gas in the atmosphere can be measured accurately.

According to the second aspect of the present invention, the switching unit switches the first state and the second state alternately a predetermined number of times, and then switches to the third state. For this reason, after measuring the predetermined gas concentration in the atmosphere in which the concentration of the predetermined gas is zero and the predetermined gas concentration in the atmosphere in the atmosphere alternately a predetermined number of times, Since the gas concentration is measured, it is possible to prevent the time required for correcting the error from being prolonged.

According to invention of Claim 3 , since the concentration measuring device is covered with the heat insulation tank, it can prevent that the heat of an external environment is transmitted to a concentration measuring device, and the temperature of the atmosphere in a concentration measuring device goes up and down. Can be prevented. Therefore, the concentration of the predetermined gas can be measured more accurately.

According to the fourth aspect of the present invention, since the concentration measuring apparatus includes the above-described concentration measuring device or the like, it accurately measures the concentration of the predetermined gas in the atmosphere even after the usage time has elapsed. be able to.

According to the fifth aspect of the present invention, since the storage box containing the concentration measuring device is made of a heat insulating material, heat from the external environment can be prevented from being transmitted to the concentration measuring device, and the atmosphere inside the concentration measuring device. Can be prevented from rising and falling. Therefore, the concentration of the predetermined gas can be measured more accurately.

It is explanatory drawing which shows the structure of the radiosonde concerning one Embodiment of this invention. It is explanatory drawing which shows the structure of the carbon dioxide module of the radiosonde shown by FIG. It is explanatory drawing which shows typically the front of the light reception unit of the carbon dioxide module shown by FIG. It is explanatory drawing which shows typically the cross section of the VI-VI line in FIG. It is explanatory drawing which shows the relationship between the density | concentration of the carbon dioxide which the carbon dioxide module shown by FIG. 2 outputs, and an actual density | concentration. 2 is a flowchart in which the radiosonde control unit shown in FIG. 1 measures the concentration of carbon dioxide in the atmosphere.

  Hereinafter, a radiosonde 1 as a concentration measuring apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

  As shown in FIG. 1, the radiosonde 1 includes a balloon 2, a storage box 3, and a plurality of string-like suspension strings 4. The balloon 2 is filled with a gas lighter than air, such as helium, and released into the air. The balloon 2 floats the storage box 3 in the air. The storage box 3 is made of a well-known heat insulating material, is formed in a box shape, and is connected to the balloon 2 by a hanging string 4.

  As shown in FIG. 1, the storage box 3 includes an inlet pipe 5 as an atmosphere introduction unit, and a concentration measuring device that is filled with the atmosphere and measures the concentration of carbon dioxide as a predetermined gas in the atmosphere. A carbon dioxide module 6, a heat insulating tank 7, an outlet pipe 8, a removing tank 9 as a removing means, a reference gas accommodating part 10, a switching part 11 as a switching means, a pump 12, a pressure sensor 13, A connecting pipe 17, a battery 14 as a power source, a transmitter 15, and a control unit 16 as control means are accommodated. That is, the radiosonde 1 includes an inlet pipe 5 as an atmosphere introduction section, a carbon dioxide module 6, a heat insulating tank 7, an outlet pipe 8, a removal tank 9, a reference gas storage section 10, and a switching section 11. A pump 12, a pressure sensor 13, a connection pipe 17, a battery 14, a transmitter 15, and a control unit 16.

  The inlet pipe 5 includes a main pipe 18 and a plurality of branch pipes 19a, 19b, and 19c. The main pipe 18 is formed in a tubular shape and has one end opened to the outer surface of the storage box 3, and guides the atmosphere outside the storage box 3, that is, outside the atmosphere, to the storage box 3, that is, the carbon dioxide module 6. The plurality of branch pipes 19a, 19b, 19c are each formed in a tubular shape, and connect the main pipe 18, the removal tank 9, the reference gas storage unit 10, and switching valves 31a, 31b described later to each other as described later. doing.

  As shown in FIG. 2, the carbon dioxide module 6 includes a measurement cell 20, a light emitting unit 21, and a light receiving unit 22.

  The measurement cell 20 is formed in a cylindrical shape and guides infrared rays from a light source 23 described later to the light receiving unit 25. The measurement cell 20 is filled with a predetermined atmosphere by the main pipe 18 of the inlet pipe 5.

  The light emitting unit 21 is provided at one end of the measurement cell 20 and is formed in, for example, a substantially box shape, and a light source 23 is provided therein. The light source 23 emits infrared light as light from one end of the measurement cell 20 toward the other end when a voltage is applied. As the light source, for example, a black body furnace or a light bulb is used. A reflector 24 is attached to the light source 23. The reflector 24 reflects the light emitted from the light source 23 and directs it to the light receiving unit 25 as parallel light.

  The light receiving unit 22 is provided at the other end of the measurement cell 20 and is formed in a substantially box shape, for example, and a light receiving unit 25 is provided therein. As shown in FIGS. 3 and 4, the light receiving unit 25 includes a unit body 26 and a plurality of light receivers 27. The unit body 26 is formed in a box shape.

  In the illustrated example, two light receivers 27 are provided. Each of the light receivers 27 includes an infrared sensor 29 as a sensor and a transmission member 30. The infrared sensor 29 is attached to the unit main body 26. The infrared sensors 29 of the plurality of light receivers 27 are arranged on the same plane. The infrared sensor 29 receives the infrared light emitted from the light source 23 and transmitted through the transmission member 30, and converts the heat of the infrared light into electrical energy. The infrared sensor 29 converts infrared heat into electrical energy and outputs the converted energy to a control unit 16 described later as a sensor output. As the infrared sensor 29, for example, a thermopile type is used.

  The transmissive member 30 is attached to the unit main body 26 and is disposed between the infrared sensor 29 and the light source 23. The transmission members 30 of the plurality of light receivers 27 are arranged on the same plane. Each of the transmitting members 30 transmits only infrared light having a predetermined wavelength out of infrared light from the light source 23 and guides the infrared light having the transmitted wavelength to the infrared sensor 29. The transmission members 30 of the plurality of light receivers 27 have different wavelengths of infrared rays that pass through each other.

  The wavelength of the infrared rays that pass through the transmissive member 30 is determined according to the gas to be measured by the concentration measuring device 1. The light receiver 27 uses carbon dioxide as a measurement target gas. In the illustrated example, one of the light receivers 27 is used as a reference, and the transmitting member 30 transmits only infrared light having a wavelength of about 4.0 μm that does not attenuate at all in the atmosphere. The other light receiver 27 is used to measure the concentration of carbon dioxide, and transmits only infrared rays having a wavelength that the transmitting member 30 easily transmits or passes in the carbon dioxide described above is around 4.3 μm.

  The heat insulation tank 7 is comprised with a well-known heat insulating material, and is formed in the box shape. The heat insulation tank 7 covers the measurement cell 20, that is, the carbon dioxide module 6.

  The outlet pipe 8 is formed in a tubular shape, and one end is attached to the measurement cell 20 of the carbon dioxide module 6 and the other end is opened on the outer surface of the storage box 3. The outlet pipe 8 discharges the atmosphere in the measurement cell 20 of the carbon dioxide module 6 to the outside.

  The removal tank 9 is a container containing an adsorbent (for example, soda lime) that adsorbs carbon dioxide. The removal tank 9 is connected to the main pipe 18 by a branch pipe 19 a of the inlet pipe 5. The removal tank 9 is connected to the main pipe 18 of the inlet pipe 5 by a branch pipe 19b through switching valves 31a and 31b described later. The removal tank 9 receives atmospheric atmosphere from the main pipe 18 and the branch pipe 19a of the inlet pipe 5, adsorbs carbon dioxide in the introduced atmosphere to the adsorbent, and removes carbon dioxide from the atmosphere. . And the removal tank 9 can guide the atmosphere from which carbon dioxide has been removed to the main pipe 18 of the inlet pipe 5 through the branch pipe 19b and the like.

  The reference gas storage unit 10 is a container that stores a gas containing carbon dioxide having a predetermined concentration D (shown in FIG. 5). The reference gas storage unit 10 is connected to the main pipe 18 of the inlet pipe 5 via the branch pipe 19 c of the inlet pipe 5 and the like. The reference gas storage unit 10 can guide the gas containing carbon dioxide having the concentration D described above to the main pipe 18 of the inlet pipe 5.

  The switching unit 11 includes a plurality of switching valves 31a and 31b. In the illustrated example, two switching valves 31a and 31b are provided, each being a known three-way valve. One switching valve 31 a is provided closer to the carbon dioxide module 6 than the central portion of the main pipe 18 of the inlet pipe 5, that is, the branch pipe 19 a, and two of the three flow paths are the main pipe 18 of the inlet pipe 5. It is linked to. In the other switching valve 31 b, two of the three channels are connected to branch pipes 19 a and 19 c connected to the removal tank 9 and the reference gas storage unit 10. Further, the remaining flow paths of these two switching valves 31a and 31b are connected to each other by a branch pipe 19b.

  In the configuration described above, the switching unit 11 directly opens the inlet pipe 5 and opens only the atmosphere in the atmosphere introduced by the main pipe 18 of the inlet pipe 5 to the carbon dioxide module 6 by opening and closing the valve bodies of the switching valves 31a and 31b. A first state of guiding, a second state of guiding only the atmosphere in the atmosphere introduced by the main pipe 18 of the inlet pipe 5 to the carbon dioxide module 6 via the removal tank 9, and the inlet pipe 5 Without introducing the atmospheric atmosphere introduced by the main pipe 18 directly or indirectly to the carbon dioxide module 6, only the gas containing carbon dioxide having a predetermined concentration D in the reference gas storage unit 10 is obtained. It is possible to switch to the third state leading to 6.

  The pump 12 is attached to the main pipe 18 of the inlet pipe 5 and is provided between the switching valve 31 a and the carbon dioxide module 6. The pump 12 sucks the atmosphere in the atmosphere or the gas in the reference gas storage unit 10 into the carbon dioxide module 6 through the main pipe 18 of the inlet pipe 5.

  The pressure sensor 13 is connected to a location between the pump 12 of the main pipe 18 of the inlet pipe 5 and the carbon dioxide module 6 by a tubular connection pipe 17, and the atmosphere in the atmosphere is connected via the connection pipe 17. Supplied. The pressure sensor 13 is composed of, for example, a semiconductor pressure sensor, and is a sensor that measures the absolute pressure (also referred to as a pressure based on a complete vacuum or a static pressure) of the atmosphere in the atmosphere.

  The battery 14 supplies power to the transmitter 15, the control unit 16, the carbon dioxide module 6, and the like.

  The transmitter 15 is configured such that the atmospheric carbon dioxide concentration DF (shown in FIG. 5) obtained by the measurement by the carbon dioxide module 6 or the like, or the atmospheric pressure (static pressure) measured by the pressure sensor 13. Pressure) is transmitted to the ground station or the like.

  The control unit 16 is a central processing unit (CPU) that performs various processes and controls according to a known predetermined program, a program for the CPU, etc. (including the concentration D of carbon dioxide in the gas in the reference gas storage unit) ROM that is a read-only memory that stores data, RAM that is a read / write memory that stores various data and has an area necessary for processing operations of the CPU, and electricity that can hold stored contents even in the off state Microcomputer with built-in read-only memory, counter, timer, etc. that can be erased and rewritten automatically, controlling the operation of the switching valves 31a and 31b, the pump 12, the carbon dioxide module 6, the transmitter 15 and the pressure sensor 13. In charge of overall control of Radiosonde 1. Thus, the control unit 16 is a computer that operates according to a predetermined program.

  The control unit 16 controls the carbon dioxide module 6 as follows to measure the concentration of carbon dioxide in the atmosphere in the measurement cell 20. First, the control unit 16 blinks the light source 23 (pulse lighting) and causes each infrared sensor 29 to receive infrared rays from the light source 23. And the control unit 16 measures the density | concentration in the atmosphere in the measurement cell 20 of predetermined gas (in the example of illustration, carbon dioxide) based on the intensity | strength of the infrared rays etc. which the infrared sensor 29 received. Specifically, the control unit 16 compares the intensity of the infrared light received by the infrared sensor 29 used as a reference with the intensity of the infrared light received by the infrared sensor 29 for measuring carbon dioxide. Measure the concentration of carbon dioxide.

  In addition, after the radiosonde 1 is released into the air, the control unit 16 controls the entire radiosonde 1 as follows. In step S1 of FIG. 6, the control unit 16 counts n = 1, stores this n = 1 in the memory, and then proceeds to step S2. In step S2, the control unit 16 causes the switching unit 11 to switch the inlet pipe 5 to the second state so that the atmosphere in the atmosphere from which carbon dioxide has been removed by the removal tank 9 is filled in the measurement cell 20, The carbon dioxide module 6 is made to measure the concentration of carbon dioxide in the atmosphere. Then, for example, the control unit 16 obtains the concentration ΔD (shown in FIG. 5) of carbon dioxide in the atmosphere. When the concentration ΔD is not zero, the electric energy of the light receiver 27 at which the concentration ΔD is zero is calculated from the electric energy of the light receiver 27 at which the concentration ΔD is zero, and the electric energy is stored in the memory. To do. That is, in step S2, the control unit 16 adjusts the atmosphere in which the carbon dioxide concentration is zero so that the concentration measuring device can measure that the carbon dioxide concentration is zero. Then, the process proceeds to step S3.

  In step S3, the control unit 16 causes the switching unit 11 to switch the inlet pipe 5 to the first state so that the atmosphere in the atmosphere is directly filled in the measurement cell 20, and the concentration of carbon dioxide in the atmosphere is reduced. The carbon module 6 is measured. Then, the control unit 16 corrects the concentration of carbon dioxide obtained by measurement based on the electrical energy stored in the memory in the above-described step S2, and the actual carbon dioxide concentration DF in the atmospheric atmosphere described above. (Shown in FIG. 5) is calculated. Further, the control unit 16 causes the pressure sensor 13 to measure the atmospheric pressure. Then, the control unit 16 stores the result in the memory and proceeds to step S4. In step S4, the control unit 16 causes the transmitter 15 to transmit the actual concentration DF of atmospheric carbon dioxide and the atmospheric pressure to the ground station, and proceeds to step S5.

  In step S5, the control unit 16 determines whether or not N is equal to or greater than a predetermined number of times P. If it is determined that N is not equal to or greater than the predetermined number of times P, the process proceeds to step S6. If N is determined to be equal to or greater than the predetermined number of times P, the process proceeds to step S7. In step S6, the control unit 16 counts n as n + 1 and returns to step S1. Thus, the control unit 16 repeats steps S1 to S6 until N becomes equal to or greater than a predetermined number of times P. In short, the control unit 16 switches the switching unit 11 alternately between the second state and the first state in steps S1 to S6. Further, the control unit 16 repeats Step S1 to Step S6 to switch the switching unit 11 between the second state and the first state, and the carbon dioxide in the second state measured by the carbon dioxide module. Based on the concentration ΔD, the concentration of carbon dioxide in the first state measured by the carbon dioxide module 6 is corrected to calculate the actual concentration DF.

  In step S7, the control unit 16 causes the switching unit 11 to switch the inlet pipe 5 to the third state, and fills the gas in the reference gas storage unit 10 into the measurement cell 20, and the carbon dioxide of the gas The concentration is measured by the carbon dioxide module 6. Then, for example, the control unit 16 obtains a concentration Di (shown in FIG. 5) of carbon dioxide in the gas. The control unit 16 stores in the memory a value D / Di obtained by dividing the gas concentration D by this concentration Di, and proceeds to step S8. In step S8, the control unit 16 resets the count to zero and returns to step S1. Thus, the control unit 16 repeats step S1 to step S8 until the battery power is exhausted.

  At this time, in step S3 after the second round from step S1 to step S8, if the concentration of carbon dioxide measured by the carbon dioxide module is DI (shown in FIG. 5), the control unit 16 sets DI to DI. The actual concentration DF (shown in FIG. 5) of carbon dioxide in the atmosphere is calculated by multiplying (multiplying) (D / Di). That is, if the actual concentration of carbon dioxide in the atmosphere is DF, DF = DI × (D / Di) is established. In short, the solid line in FIG. 5 shows the case where the concentration DI measured by the carbon dioxide module matches the actual concentration DF, that is, the case where there is no measurement error in the carbon dioxide module 6. Even if the concentration DI measured by the carbon dioxide module does not coincide with the actual concentration DF, and an error occurs, for example, as indicated by a one-dot chain line in FIG. 5, the actual concentration of carbon dioxide in the atmosphere in the atmosphere is accurate. DF can be measured.

  Thus, the control unit 16 repeats step S1 to step S8, thereby switching the switching unit 11 to the second state, the first state, and the third state, and the second state measured by the carbon dioxide module 6. The carbon dioxide concentration DI in the first state measured by the carbon dioxide module 6 based on the carbon dioxide concentration ΔD at the time and the carbon dioxide concentration Di in the third state measured by the carbon dioxide module 6 Correct. Further, the control unit 16 repeats Step S1 to Step S8 to switch the switching unit 11 to the second state and the first state alternately after a predetermined number of times P, and then switch the switching unit to the third state. Switch to the state.

  According to the present embodiment, a first state in which the atmosphere in the atmosphere is directly led to the carbon dioxide module 6 by the switching unit 11 and a second state in which the atmosphere in the atmosphere is led to the carbon dioxide module 6 through the removal tank 9. And the predetermined concentration of carbon dioxide in the atmosphere is measured. For this reason, the above-mentioned carbon dioxide concentration ΔD in an atmosphere that does not contain any predetermined carbon dioxide, that is, the carbon dioxide concentration ΔD in an atmosphere in which the carbon dioxide concentration is zero, and the atmosphere in the atmosphere described above. The concentration of carbon dioxide is measured by switching, and even if the error in the measurement result of the carbon dioxide module 6 increases with the usage time, the influence of the error is eliminated and the measurement is accurately performed even after the usage time has elapsed. The concentration of carbon dioxide in the atmosphere can be measured.

  In order to measure the concentration of carbon dioxide in the atmosphere by alternately switching between the first state and the second state by the switching unit stage, the above-mentioned concentration of carbon dioxide ΔD in an atmosphere containing no carbon dioxide, that is, dioxide The above-described carbon dioxide concentration ΔD in an atmosphere having a carbon concentration of zero and the above-described carbon dioxide in an atmosphere in the atmosphere are alternately measured. Therefore, even if the error of the measurement result of the carbon dioxide module 6 increases with the use time, the influence of the error is removed, and the above-mentioned concentration of carbon dioxide in the atmosphere is measured more accurately even after the use time has elapsed. can do.

  In addition, the switching unit 11 causes the first state, the second state, and the third gas that guides the gas containing the carbon dioxide in the reference gas storage unit 10 to the carbon dioxide module 6 in a predetermined concentration D. The predetermined concentration of carbon dioxide in the atmosphere is measured. For this reason, the above-mentioned carbon dioxide concentration ΔD in the atmosphere where the carbon dioxide concentration is zero, the above-mentioned carbon dioxide concentration in the atmosphere in the atmosphere, and the above-mentioned gas containing the carbon dioxide in a predetermined concentration D are described above. Therefore, even if the error in the measurement result of the carbon dioxide module 6 increases with the usage time, the influence of the error is removed and the usage time elapses. It is possible to accurately measure the concentration of carbon dioxide described above in the atmosphere.

  After the switching unit 11 alternately switches the second state and the first state by a predetermined number of times P, the state is switched to the third state. For this reason, after measuring the above-mentioned carbon dioxide concentration ΔD in the atmosphere in which the carbon dioxide concentration is zero and the above-mentioned carbon dioxide concentration in the atmosphere in the atmosphere alternately for a predetermined number of times P, the reference gas storage unit 10 Since the concentration of the gas inside is measured, it is possible to prevent the time required for correcting the error from being prolonged.

  Moreover, since the carbon dioxide module 6 is covered with the heat insulation tank 7, it can prevent that the heat of an external environment is transmitted to the carbon dioxide module 6, and the temperature of the atmosphere in the measurement cell 20 of the carbon dioxide module 6 goes up and down. Can be prevented. Therefore, the concentration of carbon dioxide can be measured more accurately.

  Since the radiosonde 1 includes the above-described carbon dioxide module 6 and the like, the concentration of the above-described carbon dioxide in the atmosphere can be accurately measured even after the usage time has elapsed.

  Moreover, since the storage box 3 containing the carbon dioxide module 6 and the like is formed of a heat insulating material, heat from the external environment can be prevented from being transmitted to the carbon dioxide module 6, and the temperature of the atmosphere in the carbon dioxide module 6 is increased and decreased. Can be prevented. Therefore, the concentration of the predetermined gas can be measured more accurately.

  In the above-described embodiment, the case where the concentration of carbon dioxide in the atmosphere is measured is shown. However, in the present invention, the concentration of various gases is not limited to carbon dioxide.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 Radiosonde (concentration measuring device)
2 Balloon 3 Storage box 5 Inlet pipe (atmosphere introduction part)
6 Carbon dioxide module (concentration meter)
7 Insulation tank 9 Removal tank (removal means)
10 Reference gas accommodating part 11 Switching part (switching means)
15 Transmitter 16 Control unit (control means)
ΔD Predetermined gas concentration in the second state D Predetermined concentration Di Predetermined gas concentration in the third state DI Predetermined gas concentration in the first state Concentration P Predetermined number of times

Claims (5)

A concentration measuring device that is filled with an atmosphere and measures the concentration of a predetermined gas in the atmosphere;
An atmosphere introduction part for guiding an atmosphere in the atmosphere to the concentration measuring device;
Removing means for removing the predetermined gas from the atmosphere introduced by the atmosphere introduction unit;
Switching means capable of switching the atmosphere introduction section between a first state for directly guiding the atmosphere to the concentration measuring device and a second state for guiding the atmosphere to the concentration measuring device via the removing means;
The switching means is switched between the second state and the first state, and the concentration measurement is performed based on the predetermined gas concentration in the second state measured by the concentration measuring device. Control means for correcting the concentration of the predetermined gas when the vessel is in the first state,
With
The concentration measuring device includes a light emitting unit that emits light, and a plurality of light receiving units that include transmission members that transmit the light having different wavelengths.
The control means alternately switches the switching means between the second state and the first state ;
A reference gas storage unit for storing a gas containing a predetermined concentration of the predetermined gas ;
The switching means is capable of switching the atmosphere introduction part to the first state, the second state, and a third state for guiding the gas in the reference gas storage part to the concentration measuring device,
The control means switches the switching means to the second state, the first state, and the third state, and the predetermined state at the time of the second state measured by the concentration measuring device. The concentration of the gas is reduced and divided by the predetermined gas concentration in the third state measured by the concentration meter, and the actual gas in the predetermined state in the third state is divided. A concentration measuring device for correcting the predetermined gas concentration in the first state measured by the concentration measuring device by multiplying by the concentration. The control means switches the switching means to the third state after switching the switching means alternately between the second state and the first state a predetermined number of times. The concentration measuring apparatus according to claim 1 . Concentration measuring apparatus according to claim 1 or 2, further comprising a thermal insulation vessel which consists of a heat insulating material and covering the concentration measuring instrument. A storage box containing at least the concentration measuring device;
A balloon for floating the storage box in the air;
A transmitter for transmitting information indicating the concentration of the predetermined gas after the correction calculated by the control means;
The concentration measuring device according to any one of claims 1 to 3 , further comprising: The concentration measuring apparatus according to claim 4 , wherein the storage box is made of a heat insulating material.

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