JP6660445B2 - Disconnection detection sensor - Google Patents

Description

  The present invention relates to a technique for observing cracks generated in materials, structures, machines, and the like.

  2. Description of the Related Art A technique for observing the progress of cracks generated in buildings, bridges and the like is known.

  2. Description of the Related Art Conventionally, a resistance change type sensor called a “crack gauge” is generally used for detecting the degree of progress of a crack caused by aging of a structure such as a tunnel or a bridge. In the conventional crack gauge, a plurality of linear resistance elements that are electrically connected in parallel are arranged on the downstream side in a direction in which cracks generated on the concrete surface are assumed to progress. Due to the tensile force generated in the direction perpendicular to the direction in which the crack progresses in accordance with the progress of the crack, the parallel combined resistance increases as each linear resistance element is sequentially broken, and this is converted into a voltage change to crack. (For example, refer to Patent Document 1).

  On the other hand, there is known a means for wirelessly transmitting a detection result of a sensor without using a battery or an external power supply (for example, see Patent Document 2). In this method, the amount of strain detected by a resistance change type sensor called a “strain gauge” is wirelessly transmitted to an RFID reader using a 13.56 MHz band RFID. In addition to the communication between the RFID reader and the RFID on the sensor side, a power receiving coil dedicated to power transmission is provided on the sensor side, and the power supply is supplied from the RFID reader to the sensor side in a non-contact manner by magnetic coupling with the coil. There is also known a configuration in which the AD conversion circuit and the wireless transmission / reception circuit operate more stably.

  Further, both the strain gauge and the crack gauge are resistance change type sensors that react to an external pressure. If the “strain gauge” in Patent Document 2 is replaced with a “crack gauge”, it can function as a crack sensor.

  However, in the case of the sensor using the crack gauge described in Patent Literature 1, a change in resistance value caused by the progress of cracks is detected as a change in voltage by a Wheatstone bridge circuit or the like. Therefore, in order to wirelessly transmit the data as data, it is necessary to provide an A / D converter for converting a voltage value, which is an analog amount, into digital data on the sensor side. Generally, the A / D converter requires large power consumption. Therefore, an external power supply by a battery or a wire was required.

  On the other hand, the sensor disclosed in Patent Document 2 performs non-contact power supply to the sensor by magnetic coupling, so that it is not necessary to mount a battery on the sensor or supply an external power supply through a wire. In order to obtain sufficient power to operate the wireless communication hardware, the RFID reader is brought close enough to the vicinity of the sensor (within 1-2 cm), and the magnetic coupling between the coils is sufficiently strong. There is a need.

  Therefore, when the sensor is installed in a high place or a recessed place where it is difficult for the worker to access, in order to allow the worker having the RFID reader to approach the vicinity of the sensor, the high work vehicle is required. They need to be used and scaffolded, which is costly and time consuming. In some cases, it was necessary to take measures such as closing traffic near the site. In addition, for example, there is a problem that it is difficult to cope with the above-described conventional method in actual operation, such as a lower surface of a floor plate of a bridge over a large river.

  The present invention has been made to solve the above-described problems, and has as its object to provide a technique for observing cracks generated in materials, structures, machines, and the like.

In order to solve the above-described problem, one embodiment of the present invention is to arrange a plurality of linear disconnection detecting elements which are electrically disconnected when a tensile force exceeds a threshold at intervals of a crack measurement resolution, each of which has a different individual identification. RFIDs with information are connected one-on-one, and using the electromotive force derived from the radio wave received by each RFID as a power source, information indicating the presence / absence of disconnection of the disconnection detection element connected to the RFID and its own identification information The present invention relates to a passive type crack sensor that wirelessly transmits in association.
In order to solve the above problem, one embodiment of the disconnection detection sensor of the present invention includes a base, a plurality of breakable portions, and a plurality of RFIDs. The base is attached to the observation target. The plurality of fractured portions are held by the base, are arranged at intervals in the first direction, and are electrically disconnected by deformation of the base due to deformation of the observation target. The plurality of RFIDs are held by the base, connected to the to-be-broken portion, and wirelessly transmit the presence / absence of disconnection of the to-be-broken portion to which they are connected and their own identification information using an electromotive force derived from a received radio wave as a power source.
In order to solve the above-described problems, one embodiment of the method for transmitting a crack progress state of the present invention is a method of transmitting a crack progress state which is held on a base attached to an observation target and is arranged at intervals in a first direction, and the base is deformed by the deformation of the observation target. This is a method of transmitting the progress of cracking by a plurality of RFIDs having a memory that is connected to a rupturable part that is electrically disconnected due to deformation and held by a base. In this method, each RFID receives a radio wave from a reader, and when the to-be-fractured part is broken, when the memory does not store that the to-be-fractured part is broken, the memory stores the to-be-fractured part in the memory. The breaking information and the time information in the radio wave as the breaking time of the breakable portion are stored, and the presence or absence of breakage of the breakable portion and the break time are transmitted to the reader.
In order to solve the above problem, one embodiment of the disconnection detection sensor of the present invention includes a base, a plurality of breakable portions, and a plurality of RFIDs. The plurality of fractured portions are located at positions separated from each other on the base, and are electrically disconnected by applying a tensile force. The plurality of RFIDs are on the base body, and wirelessly transmit the presence / absence of disconnection of the to-be-fractured part connected thereto and the individual identification information of the RFID.
In order to solve the above problems, one embodiment of the disconnection detection sensor of the present invention includes a base sheet, a plurality of wirings, and a plurality of RFIDs. The plurality of wirings are arranged on the base sheet, and are a plurality of wirings having a linear torn portion area that is electrically disconnected when the tensile force exceeds a threshold value, and the torn area of each wiring is Line up at intervals. The plurality of RFIDs are arranged on the base sheet, connected to the wiring, and using the electromotive force derived from the received radio wave as a power source, determining whether or not the wiring connected thereto is disconnected and its own identification information. Wirelessly.

It is a figure showing an example of the system composition of the crack observation system by an embodiment of the invention. It is a figure for explaining composition of crack observation sensor 1 by this embodiment. It is a figure for explaining composition of crack observation sensor 1 by this embodiment. It is a figure for explaining composition of crack observation sensor 1 by this embodiment. It is a figure showing the basic composition of each passive type RFID provided in crack observation sensor 1 by this embodiment. FIG. 3 is a diagram for describing a memory area in an RFID tag IC chip. FIG. 4 is a diagram illustrating a relationship between an arrangement order and an arrangement code of “fracture portions” of each electric wiring in a predetermined direction on a base sheet 101. It is a figure showing signs that crack observation sensor 1 by this embodiment was fixed to a beam as an object for observation. FIG. 3 is a control block diagram provided in the RFID reader 7. It is a flowchart for demonstrating the flow of a process (crack observation method) in a crack observation system.

  Hereinafter, a crack observation sensor and a crack observation system including the same according to an embodiment of the present invention will be described with reference to the drawings.

<System configuration>
FIG. 1 is a diagram illustrating an example of a system configuration of a crack observation system according to an embodiment of the present invention.

  As shown in FIG. 1, the crack observation system according to the embodiment of the present invention includes a crack observation sensor 1 and an RFID reader 7. The RFID reader 7 held by the worker 900 wirelessly reads and writes data with the crack observation sensor 1 fixed to the observation target by pasting or the like by radio waves.

  First, the crack observation sensor 1 will be described. The crack observation sensor 1 is installed at a site where cracks have already started or a site where cracks are expected to occur, such as a concrete surface of a structure. The crack observation sensor 1 is fixed to the surface of the observation target by, for example, an adhesive or the like.

2 to 4 are diagrams for explaining the configuration of the crack observation sensor 1 according to the present embodiment.
The crack observation sensor 1 includes, for example, a base sheet 101, passive RFIDs 110, 120, 130, 140, 150, 160, 170, 180, 190 and 1 a 0, and a plurality of individually provided RFIDs corresponding to the passive RFIDs. And the like.

  For the base sheet 101, for example, a thin insulating material such as polyimide formed in a circular shape can be adopted. Of course, the shape of the base sheet 101 is not limited to a circle, and any shape can be adopted as long as each element to be arranged on the base sheet can be arranged.

  A cutout is formed in the vicinity of the center of the base sheet 101, and is divided into a substantially rectangular region (breakable region) near the center and a region (circuit region) surrounding the substantially rectangular region. ing. In addition, the substantially rectangular area (breakable area) near the center and the area (circuit area) surrounding the substantially rectangular area are connected by a connection area.

  The passive-type RFIDs 110, 120, 130, 140, 150, 160, 170, 180, 190, and 1a0 use a memory 17b (storage unit) to be described later by using power generated using a radio wave received from an external communication device such as the RFID reader 7. ) Is transmitted to the external communication device.

  Here, the respective passive RFIDs 110, 120, 130, 140, 150, 160, 170, 180, 190 and 1a0 are the antennas 111, 121, 131, 141, 151, 161, 171, 181, 191 and 1a1, respectively. Terminals 113 and 114, 123 and 124, 133 and 134, 143 and 144, 153 and 154, 163 and 164, 173 and 174, 183 and 184, 193 and 194, 1a3 and 1a4, and the like are provided.

The terminals 113 and 114, 123 and 124, 133 and 134, 143 and 144, 153 and 154, 163 and 164, 173 and 174, 183 and 184, 193 and 194 and 1a3 and 1a4 of each passive RFID are respectively It is electrically connected to electric wiring (partially forms a portion to be broken) 115, 125, 135, 145, 155, 165, 175, 185, 195 and 1a5. Specifically, as shown in FIG. 2 , for example, one end and the other end of the electric wiring 175 are connected to the terminals 173 and 174 of the passive type RFID 170, thereby forming an annular electric circuit. For even all other Passive type RFID shown in FIG. 2, the annular electric circuit is formed.

  As described above, the electric wirings 115, 125, 135, 145, 155, 165, 175, 185, 195, and 1a5 connected to the terminals of each passive type RFID have a pattern as shown in FIGS. Is formed into a pattern by a photoetching method or the like.

  Each of the electric wirings 115, 125, 135, 145, 155, 165, 175, 185, 195 and 1a5 formed on the base sheet 101 as described above is formed on the base sheet 101 cut off from the periphery by a notch. In a substantially rectangular area (area to be broken), they are arranged in a “predetermined direction” defined as a growth direction of a crack to be observed. Here, each wiring portion (see region 1t in FIG. 1) that is pattern-formed on a substantially rectangular region (broken portion region) on the base sheet 101 corresponds to a “broken portion”.

  Here, the portions of the electric wirings 115, 125, 135, 145, 155, 165, 175, 185, 195, and 1a5 corresponding to the “fracturable portions” are respectively in a direction substantially orthogonal to the “predetermined direction”. It is set so that it is broken when it is stretched beyond a predetermined length.

  Specifically, for example, as shown in FIG. 4, a plurality of fractured portions are arranged in a direction (predetermined direction) in which propagation of the crack is assumed from a position corresponding to the tip of the crack. Therefore, if the crack sensor 1 according to the present embodiment is correctly installed on the observation target, as the crack 41 progresses, the crack sequentially traverses the to-be-fractured portions of the wirings arranged in parallel. I will do it.

  On the base sheet 101, a protective film layer made of a resin film or the like is provided on the surface after arranging each electric element, wiring, and the like.

  The thickness and the material of the base sheet 101 are broken in accordance with the arrival of the crack based on the tensile force applied to the resin sheet 6 due to the crack on the surface of the observation object to which the base sheet 101 is adhered and the elongation rate of the material. The detection element 1 is designed to be quickly disconnected.

  The arrangement interval of each fractured part is determined based on the resolution of detecting the degree of progress of the crack. For example, when it is desired to observe the degree of progress of the crack every 0.5 mm, the arrangement interval of the electric wires constituting the portion to be broken is also set to the same 0.5 mm width.

  Further, in a region (circuit region) surrounding a substantially rectangular region (fracture portion region) of the base sheet 101, electric elements such as passive RFIDs and electric wiring for electrically connecting these electric elements are provided. Are arranged.

  A connection region (region connection portion) that connects a substantially rectangular region (breakable region) of the base sheet 101 and a region surrounding it (circuit region) has a width W in a direction orthogonal to the “predetermined direction”. Is smaller than the width K of the substantially rectangular region (fracture region) of the base sheet 101.

  With such a configuration, the "breakable portion region" and the "circuit region" are connected by a narrow "connection region", so that the "breakable portion region" is independent of the "circuit region". In the direction orthogonal to the predetermined direction. In other words, the influence of the deformation of the “fracture portion region” accompanying the generation or propagation of cracks in the object does not extend to the “circuit region”.

  In other words, the deformation of the “fracture portion region” due to the generation or progress of the crack is not suppressed by the “circuit region”, and can contribute to the improvement of the reliability of the observation of the crack state.

  Also, among the wirings that electrically connect the plurality of “breakable portions” arranged in the “breakable region” and at least one of the passive RFIDs 170 to 1a0 arranged in the “circuit region”, The portion passing through the “connection region” is pattern-formed so that at least a part thereof extends in a direction different from a direction orthogonal to the “predetermined direction (crack propagation direction shown in FIG. 4)”.

  In this way, by providing at least a part of the wiring passing through the connection region so as to extend in a direction different from the direction orthogonal to the predetermined direction, for example, the connection region is moved in the direction orthogonal to the predetermined direction due to the influence of the development of cracks. Even when the wiring extends, at least a part of the wiring passing through the connection region can reduce the influence of the expansion. Therefore, when the connection region extends in the direction orthogonal to the predetermined direction due to the effect of the crack, the wiring passing through the connection region does not break.

  In the crack observation sensor 1 according to the present embodiment, the passive-type RFID antennas are individually provided corresponding to the plurality of fractured portions.

  As described above, by individually providing each of the plurality of to-be-fractured parts with an antenna as a transmission / reception unit, even if one of the antennas fails, at least a signal with another antenna group that does not have a failure is obtained. Can be continued. Thereby, it is possible to contribute to the improvement of the reliability as a sensor for observing the occurrence and progress of a crack of the object.

  Further, a first antenna (for example, the antenna 191) among the plurality of antennas 111, 121, 131, 141, 151, 161, 171, 181, 191 and 1a1 and a second antenna (for example, the antenna) adjacent to the first antenna ( For example, the antennas 121 and 181 are arranged on the base sheet so as not to be parallel to each other (see the angle θ shown in FIG. 3).

  If adjacent antennas are arranged in parallel, one antenna may interfere with the transmission and reception of the other antenna, affecting communication. Therefore, by arranging the adjacent antennas in different directions, it is possible to prevent the adjacent antennas from affecting each other's reception performance.

  FIG. 5 is a diagram showing a basic configuration of each passive type RFID 110, 120, 130, 140, 150, 160, 170, 180, 190 and 1a0 provided in the crack observation sensor 1 according to the present embodiment.

  For example, the passive RFID 170 includes a passive RFID antenna 171 and an RFID tag IC chip. Here, as the RFID tag IC chip, one having a function called tamper detection provided with a so-called “disconnection detection terminal” is employed.

  The tamper detection function detects the presence or absence of a disconnection between the disconnection detection terminals 173 and 174, and according to the result, as shown in FIG. 6, states in the user area 31 of the memory 17b in the RFID tag IC chip. A memory area called a flag 32 is set to “0” or “1”. The information indicating the “arrangement order” on the base sheet 101 of the “breakable portion” of the electric wiring 175 connected to the disconnection detection terminals 173 and 174 of the RFID chip is stored in the tag ID area 33 shown in FIG. Is stored in advance in a memory area called the order code 34 of the. The passive type RFID antenna 171 forms an aluminum foil having a thickness of about 10 to 30 μm on the base sheet 101 in a desired antenna pattern by photoetching or the like, similarly to the “breakable portion” of each electric wiring.

  With such a configuration, by acquiring information from the storage unit that stores the rupture states of the plurality of ruptured parts arranged, it is possible to grasp the occurrence state of the crack in the target object and the progress state of the already occurring crack. can do. In addition, the adoption of the passive type RFID eliminates the need for providing an AD conversion circuit, which can contribute to a reduction in power supply and a significant reduction in the size of the sensor as a whole.

  FIG. 7 shows the relationship between the arrangement order and the arrangement code of the “breakable portions” of the respective electric wirings in a predetermined direction on the base sheet 101. Eight passive RFIDs and 16 pairs of corresponding RFIDs are shown. It is a figure which shows an example when the to-be-broken part is arranged. The data shown here are stored in the memories 11b, 12b, 13b, 14b, 15b, 16b, 17b, 18b, 19b provided in the passive RFIDs 110, 120, 130, 140, 150, 160, 170, 180, 190, and 1a0. And 1ab. For example, the memory 14b provided in the passive type RFID 140 stores a ranking code “3”, break information “break”, and a break date and time “2014.06.02”. Here, the identification information of each RFID and the order code are stored in association with each other in advance. It is. As for the break date and time, for example, by obtaining date and time information and the like included in the signal received from the RFID reader 7 on the RFID side, the linking as shown in FIG. 7 becomes possible.

  As described above, each memory (storage unit) corresponds to the “break information” of each of the plurality of breakable portions and the “array information” indicating the arrangement order of the respective breakable portions in the predetermined direction on the base sheet. It is attached and stored.

  As a result, by obtaining the "break information" and "array information" stored in each memory (storage unit), which of the breakable parts arranged on the sheet is broken Can be determined.

  The storage unit stores break information of each of the plurality of to-be-fractured parts and the arrangement information of the respective to-be-fractured parts in association with each other, but is not limited to this. For example, the break information of each to-be-broken portion is stored in association with unique identification information, and based on the association information between the identification information and the sequence information registered in advance in an external database or the like, It is also possible to determine at which position the fracture information stored in the storage unit corresponds to the fractured part.

  FIG. 8 is a diagram showing a state where the crack observation sensor 1 according to the present embodiment is fixed to a beam as an observation target.

  As shown in the figure, in the crack observation sensor 1 according to the present embodiment, a notch is provided in the base sheet 101 so that a rectangular “torn area” near the center of the sheet is separated from the surrounding “circuit area”. Almost independent. Therefore, by sticking only this rectangular "fracture area" to the cracking location or the place where cracks are expected to occur in the observation target, the "fracture area" is extended by the occurrence and progress of cracks. However, it does not affect the surrounding “circuit area”.

  Here, the fixing (sticking) of the rectangular “area to be broken” near the center of the crack observation sensor 1 to the observation target can be realized by, for example, a double-sided tape or an adhesive. At this time, the entire surface of the “fracture area” does not necessarily need to be attached to the observation target, and at least the vicinity of both ends in the “predetermined direction” in the “fracture section area” may be fixed to the observation target. . This makes it possible to provide a structure in which the portion to be broken is extended at least by the expansion of the surface of the observation object when the observation object cracks or develops.

  Of course, the method of fixing the crack observation sensor 1 to the observation target here is an example, and the “circuit area” in the base sheet 101 is also fixed to the observation target, and the entire crack observation sensor 1 is fixed to the observation target. When it is desired to firmly fix, a part or all of the “circuit area” of the base sheet 101 may be attached to the observation target.

  Next, the RFID reader 7 that communicates with the crack observation sensor will be described. FIG. 9 is a control block diagram of the RFID reader 7.

  The RFID reader 7 according to the present embodiment includes, for example, a CPU 701, an ASIC (Application Specific Integrated Circuit) 702, a MEMORY 703, a STRAGE (for example, a Hard Disk Drive) 704, a display 705, a touch panel 706, an antenna 707, and the like.

  In the RFID reader 7 according to the present embodiment, the CPU 701 has a role of performing various processes in the RFID reader 7, and realizes various functions by executing programs stored in the MEMORY 703, the STRAGE 704, and the like. It also has a role. Needless to say, the CPU 701 can be replaced by an MPU (Micro Processing Unit) capable of executing the same arithmetic processing. Similarly, the storage 704 can be replaced by a storage device such as a flash memory.

  The MEMORY 703 includes, for example, a random access memory (RAM), a read only memory (ROM), a dynamic random access memory (DRAM), a static random access memory (SRAM), a video RAM (VRAM), and a flash memory. It has a role of storing various information and programs used in the RFID reader 7.

<Operation description>
FIG. 10 is a flowchart for explaining the flow of processing (crack observation method) in the crack observation system.

  First, as shown in FIG. 1, a 920 MHz-band interrogation radio wave 53 is transmitted from an RFID reader 7 of a ground worker several meters away to a crack observation sensor 1 installed on a concrete lining surface or the like inside a tunnel. Transmit (ACT101).

  Then, this radio wave is received by the antenna of each passive type RFID provided in the crack observation sensor 1. Hereinafter, the operation performed by the passive RFID 170 will be described in detail as an example. The same operation is similarly performed in other passive RFIDs.

  When the interrogation wave from the RFID reader 7 is received by the antenna 171, the rectifier 177 inside the RFID tag IC chip (the rectangular range indicated by the broken line in FIG. 5) rectifies the signal, and then the regulator 17a outputs a stable DC voltage. This output is supplied to the logic unit 179, the demodulator 176, the modulator 178, the memory 17b, and the like as operation power. Here, the rectenna 177 and the regulator 17a correspond to a “power generation unit”.

  In the memory 17b, data as shown in FIG. 7 is stored in the nonvolatile readable / writable memory area as described above, and the logic unit 179 (information rewriting unit) is connected to the disconnection detection terminals 173 and 174. The presence / absence of disconnection of the breakable portion of the electrical wiring connected therebetween is detected, and when it is determined that the disconnection has occurred, the status flag 32 (break information) of the memory 17b is set to “0 (non-disconnection)”. Is rewritten to “1 (disconnection)”.

  On the other hand, the interrogation radio wave 53 received by the antenna unit 21 is demodulated by the demodulator 26, and when the logic unit 25 recognizes the arrival of the interrogation radio wave, the logic unit 25 transmits the ID area 33 and the ID area 33 in the memory 17b to the modulator 27. A series of data stored in the user area 31 is transmitted.

  The modulator 27 transmits a so-called backscatter response wave 54 that changes the impedance between the two terminals of the antenna unit 21 in two values corresponding to the binary data sequence (ACT 102).

  Here, the CPU 701 (signal acquisition unit) acquires “break information”, “break time information”, “array information”, and the like based on a signal received from the RFID of the crack observation sensor 1 with the antenna 707 ( ACT103).

  Subsequently, the CPU 701 (determination unit) determines the time at which the “first breakable portion” was broken based on the “break information”, “break time information”, “array information”, and the like acquired as described above. It is determined whether or not the time interval between T1 and the time T2 at which the “second breakable portion” disposed adjacent to the first breakable portion has broken is less than or equal to a predetermined time Th (ACT 104).

  The CPU 701 determines that the time interval between the time T1 at which the “first breakable portion” is broken and the time T2 at which the “second breakable portion” disposed adjacent to the first breakable portion is broken is a predetermined time Th. In the following cases (ACT 104, Yes), a warning display or the like is performed on a display to warn the user that the progress of the crack is fast in time.

  As described above, by judging the case where the adjacent to-be-fractured part is broken at a time interval equal to or shorter than the predetermined time, it is possible to determine the presence or absence of a crack that progresses quickly. In addition, if necessary, a warning notification can be given to an operator when the adjacent to-be-fractured part is broken at a time interval equal to or less than a predetermined time.

  In this manner, the backscatter response wave 54 is received by the RFID reader 7, and by confirming on the display 705 of the RFID reader 7 that the 0th to 4th of the arrangement order shown in FIG. Thus, the degree of progress of the crack at the location can be grasped each time.

  Each operation in the processing in the post-processing device F described above can be realized by causing the CPU 701 to execute a crack observation program stored in, for example, the MEMORY 703 or the STAGE 704.

  Further, a program that causes the computer constituting the RFID reader 7 to execute each of the above-described operations (crack observation method) can be provided as a crack observation program. In the present embodiment, the case where the program for realizing the function of carrying out the invention is previously recorded in a storage area provided inside the apparatus is exemplified, but the present invention is not limited to this. The program may be downloaded to the device, or the same program stored in a computer-readable recording medium may be installed in the device. The recording medium may be in any form as long as it can store a program and can be read by a computer. Specifically, examples of the recording medium include an internal storage device such as a ROM and a RAM, which is internally mounted in a computer, a portable storage medium such as a CD-ROM, a flexible disk, a DVD disk, a magneto-optical disk, and an IC card; A database holding a program, or another computer and its database, a transmission medium on a line, and the like can be given. Further, the function obtained by installing or downloading in advance as described above may be such that the function is realized in cooperation with an OS (operating system) or the like inside the apparatus.

  The program may be partially or entirely an dynamically generated execution module.

  Further, it goes without saying that various processes realized by causing a CPU or an MPU to execute a program in each of the above-described embodiments can also be configured to execute at least a part of the various processes in an ASIC. .

  In the above-described embodiment, the electric wires connected to the disconnection detection terminals of the other RFIDs except for some of the RFIDs (110, 150, 190, 1a0) have other electric elements arranged inside the electric wires. Not a closed loop. The purpose of this is to avoid the radio wave interference between the RFIDs by changing the direction of the antenna between the adjacent passive RFIDs, and when the circuit can be designed without worrying about the radio wave interference. Is not limited to this.

  For example, when arranging a plurality of n RFIDs on a base sheet, the (n-1) -th RFID is included in a loop formed by electrical wiring connected to the disconnection detection terminal of the n-th (n is an integer) RFID. The RFID loops may be arranged in a multiplexed structure so that the loops formed by the electric wires connected to the disconnection detection terminals are accommodated. By thus forming the wiring pattern in a multiplex structure, the space efficiency in patterning the wiring can be improved.

  Further, in the above-described embodiment, “break information” indicating the break status of each breakable portion connected to the disconnection detection terminal of each RFID, and “array information” indicating the arrangement order of each break portion, The configuration in which the information is stored in the memory provided in the RFID in association with the above is exemplified, but the configuration is not limited to this. For example, the RFID reader 7 stores a data table or the like indicating the correspondence between “RFID identification information” and “sequence information”, and based on the received “RFID identification information”, It may be determined what kind of break situation the broken portion is in. That is, it is only necessary that the RFID reader 7 can obtain “RFID identification information”, “sequence information”, and “break information” as a result of the entire system.

  Further, in the above-described embodiment, the configuration in which the antenna is individually provided for each of the plurality of arranged RFIDs is exemplified. However, the configuration is not necessarily limited thereto, and a single crack observation sensor 1 is used as a whole. A configuration including an antenna may be employed. That is, it is only necessary that the break information of the breakable portion corresponding to each RFID can be transmitted to the RFID reader 7 as a result, and the number of antennas is not limited. If the entire crack observation sensor 1 is provided with a single antenna, the problem of radio interference between the antennas is eliminated, the degree of freedom of arrangement of the antenna on the base sheet is increased, and the sensor as a whole is greatly reduced. This can contribute to downsizing.

  According to the present embodiment, a crack observation sensor that does not require mounting of a battery or power supply by wire, and that can collect data on the progress of cracking even from a reader device at a point several meters away. Can be provided.

   Furthermore, according to the present embodiment, it is possible to realize a very lightweight sheet-like crack observation sensor, and it is difficult to fall even if it is installed in a place such as the ceiling surface of the inner wall of the tunnel. Also, the danger to traffic vehicles and the like is low, and the degree of freedom of the installation location can be increased.

  As described above, according to the present embodiment, for example, the following technology can be provided.

(1) A crack observation sensor for observing a crack generated in an observation object,
A base sheet,
A plurality of fractured portions arranged on the base sheet in a predetermined direction, each of which is broken by being stretched by a predetermined length or more in a direction substantially orthogonal to the predetermined direction,
A storage unit,
Antenna and
A power generation unit that generates power using radio waves from an external communication device received by the antenna,
An information rewriting unit that stores break information indicating a break state of each of the plurality of breakable parts by the power generated by the power generation unit in the storage unit.
A demodulator that demodulates the interrogation radio wave received by the antenna by the power generated by the power generation unit,
A modulator that transmits information stored in the storage unit from the antenna by power generated by the power generation unit,
A crack observation sensor equipped with:
(2) The storage unit stores break information of each of the plurality of to-be-fractured parts in association with arrangement information indicating an arrangement order of the respective to-be-fractured parts on the base sheet in the predetermined direction. The crack observation sensor according to 1).
(3) The base sheet is
A fractured area where the plurality of fractured areas are arranged,
The storage unit, the information rewriting unit, the power generation unit, the antenna, a circuit area where the demodulator and the modulator are arranged,
Having a connection region connecting the breakable region and the circuit region,
The crack observation sensor according to (1), wherein a width of the connection region in a direction orthogonal to the predetermined direction is smaller than that of the fractured region.
(4) The storage section, the information rewriting section, the power generation section, the antenna, the demodulator, and the modulator disposed in the breakable area and the plurality of breakable sections disposed in the circuit area. (3) The crack observation according to (3), wherein at least a part of a portion of the wiring that electrically connects to at least one of the wirings passing through the connection region extends in a direction different from a direction orthogonal to a predetermined direction. Sensor.
(5) The crack observation sensor according to (1), wherein the antenna is individually provided corresponding to each of the plurality of fractured portions.
(6) The first antenna and the second antenna adjacent to the first antenna among the plurality of antennas individually provided corresponding to each of the plurality of to-be-fractured portions are provided on the base sheet. The crack observation sensor according to (5), wherein the sensors are arranged in different directions so as not to be parallel.
(7) a plurality of torn portions arranged on a base sheet in a predetermined direction, each of which is set to be broken by being stretched by a predetermined length or more in a direction substantially perpendicular to the predetermined direction; Break information indicating the break situation of each break portion, break time information indicating when the break, and array information indicating the array order in the predetermined direction on the base sheet of each breakable portion, An RFID reader that communicates with a crack observation sensor including a storage unit that stores the information in association with the antenna and an antenna that communicates with an external communication device,
Antenna and
A signal acquisition unit that acquires the break information, the break time information, and the array information based on a signal received from the RFID at the antenna;
Based on the rupture information, the rupture time information, and the array information acquired by the signal acquisition unit, a time at which a first rupturable portion is ruptured and a second rupture portion disposed adjacent to the first rupturable portion. A determination unit that determines whether a time interval between the time at which the rupturable part is broken and a time at which the part to be broken is 2 is equal to or less than a predetermined time;
An RFID reader comprising:
(8) A crack observation method for observing a crack generated in an observation object,
Arranged in a predetermined direction, and stores break information indicating a break situation of each of a plurality of breakable parts set to be broken by being stretched by a predetermined length or more in a direction substantially orthogonal to the predetermined direction. And
A crack observation method for transmitting the stored break information to the external device in response to a radio wave received from the external device.

  The present invention may be embodied in various other forms without departing from its spirit or essential characteristics. Therefore, the above-described embodiment is merely an example in all aspects, and should not be interpreted in a limited manner. The scope of the present invention is defined by the appended claims, and is not limited by the specification. Furthermore, all modifications, various improvements, substitutions and modifications belonging to the equivalent scope of the claims are all within the scope of the present invention.

101 base sheet, 110, 120, 130, 140, 150, 160, 170, 180, 190, 1a0 Passive type RFID, 701 CPU, 702 ASIC, 703 MEMORY, 704 STRAGE, 705 display, 706 touch panel, 707 antenna.

Japanese Utility Model Publication No. 63-5461 Japanese Patent No. 5010405

Claims (3)

A base attached to the observation target;
A plurality of fractured parts held by the base, arranged at intervals in a first direction, and electrically disconnected by deformation of the base due to deformation of the observation target;
Using the electromotive force derived from the interrogated radio wave received and connected to the to-be-fractured part held by the base body as a power source, the presence / absence of disconnection of the to-be-fractured part connected to itself and its own identification information are wirelessly transmitted. A plurality of RFIDs,
Each of the RFIDs is
A storage unit for storing the individual identification information,
Antenna and
A power generation unit that generates power using the interrogation radio wave from the external communication device received by the antenna,
A demodulator for demodulating the interrogation radio wave,
A modulator for transmitting information;
Upon receiving the demodulated interrogation radio wave, the power is used to update the storage unit with respect to the presence or absence of a break in the breakable unit connected to the storage unit, and the storage unit stores the breakage unit connected to the storage unit. An information rewriting unit that transmits the presence / absence of disconnection of the break part and the individual identification information via the modulator,
The storage unit stores the arrangement order of each of the breakable parts from one side to the other side in the first direction in association with the individual identification information of the RFID connected to each of the breakable parts,
The RFID is a disconnection detection sensor that wirelessly transmits the presence / absence and arrangement order of the breakable portion connected to itself and the individual identification information. The disconnection detection sensor according to claim 1 ,
A disconnection detection sensor in which the base is made of an insulating material. The disconnection detection sensor according to claim 1 or 2 ,
The substrate is
A part to be broken which is surrounded by an annular notch that is partially open, and in which the plurality of parts to be broken are arranged,
A circuit area where the respective RFIDs are arranged, which are areas outside the notch;
Including a region of the open portion of the notch, and connects the breakable portion region and the circuit region, and a connection region through which a wiring connection portion connects the RFID and the plurality of breakable portions, Have
A disconnection detection sensor having a width in a second direction orthogonal to the first direction, wherein the width of the connection region is smaller than the to-be-fractured portion.