JP6420892B2 - Disconnection detection sensor and method of transmitting crack progress - Google Patents

Description

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

  A technique for observing the progress of cracks in buildings and bridges is known.

  Conventionally, a resistance value change type sensor called a “crack gauge” is generally used to detect the progress of cracks caused by aging of structures such as tunnels and bridges. In the conventional crack gauge, a plurality of linear resistance elements that are electrically connected in parallel are arranged on the downstream side in the direction in which the progress of cracks occurring on the concrete surface is assumed. As each linear resistance element is disconnected in sequence due to the tensile force generated in the direction perpendicular to the crack progression direction as the crack progresses, its parallel combined resistance increases, and this is converted into a voltage change. Is determined (see, for example, Patent Document 1).

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

  The strain gauge and the crack gauge are both resistance change type sensors that respond to 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 a sensor using a crack gauge described in Patent Document 1, a change in resistance value accompanying the progress of a crack is detected as a change in voltage by a Wheatstone bridge circuit or the like. Therefore, in order to wirelessly transmit this as data, it is necessary to provide an A / D converter that converts an analog voltage value into digital data on the sensor side. In general, the A / D converter requires large power consumption. Therefore, it was necessary to supply an external power supply by battery or wire.

  On the other hand, since the sensor disclosed in Patent Document 2 performs non-contact power feeding to the sensor by magnetic coupling, it is not necessary to mount a battery or supply external power to the sensor by an A / D converter or In order to obtain sufficient power necessary to operate the wireless communication hardware, the RFID reader is sufficiently close to the sensor (within 1 to 2 centimeters), 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 deep place where it is difficult for the worker to access, in order to allow the worker with the RFID reader to approach the sensor, It is necessary to use or assemble a scaffold, which is expensive and time consuming. In some cases, it was necessary to take measures such as closing the road near the site. In addition, there is a problem that it may be difficult to cope with the above-described conventional method in actual operation, such as a bottom surface of a bridge floor plate over a large river.

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

In order to solve the above-described problem, according to one aspect of the present invention, a plurality of linear disconnection detection elements that are electrically disconnected when a tensile force exceeds a threshold value are arranged at intervals of crack measurement resolution, and each has a different individual identification. RFIDs having information are connected on a one-to-one basis, and information indicating the presence or absence of disconnection of a disconnection detecting element connected to itself is used as its individual identification information, using an electromotive force derived from radio waves received by each RFID as a power source. The present invention relates to a passive crack sensor that performs wireless transmission in association.
In order to solve the above problems, one embodiment of a disconnection detection sensor of the present invention includes a base, a plurality of parts to be broken, and a plurality of RFIDs. The substrate is attached to the observation object. The plurality of parts to be broken 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 object. A plurality of RFIDs are held on a base, connected to a to-be-broken portion, and wirelessly transmit the presence / absence of breakage of the to-be-broken portion to which it is connected and its own identification information using an electromotive force derived from a received radio wave as a power source.
In order to solve the above-described problem, one aspect of the method for transmitting a crack progress state according to the present invention is a method in which the substrate is held by a substrate attached to the observation object and arranged at intervals in the first direction. This is a method for transmitting a crack progress state by a plurality of RFIDs connected to a part to be broken that is electrically disconnected by deformation and held by a base and having a memory. In this method, each RFID receives a radio wave from a reader, and when the ruptured portion is ruptured, if it is not stored in the memory that the ruptured portion is broken, the ruptured portion is stored in the memory. Information on the time of breakage and the time in the radio wave as the break time of the portion to be broken is stored, and the presence or absence of breakage of the portion to be broken and the break time are transmitted to the reader.

It is a figure which shows an example of the system configuration | structure of the crack observation system by embodiment of this invention. It is a figure for demonstrating the structure of the crack observation sensor 1 by this Embodiment. It is a figure for demonstrating the structure of the crack observation sensor 1 by this Embodiment. It is a figure for demonstrating the structure of the crack observation sensor 1 by this Embodiment. It is a figure which shows the basic composition of each passive type RFID with which the crack observation sensor 1 by this Embodiment is equipped. It is a figure for demonstrating the memory area | region in a RFID tag IC chip. It is a figure which shows the relationship between the arrangement | sequence order and the arrangement | sequence code | cord | chord of "the part to be broken" of each electric wiring in the predetermined direction on the base sheet. It is a figure which shows a mode that the crack observation sensor 1 by this Embodiment was fixed to the beam as an observation object. It is a control block diagram with which the RFID reader is provided. 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 showing 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 operator 900 wirelessly exchanges data such as reading and writing data with the crack observation sensor 1 fixed by being attached to the observation object 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 to be observed by, for example, an adhesive.

2-4 is a figure for demonstrating the structure of the crack observation sensor 1 by this 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 1a0, and a plurality of individually provided corresponding to these passive RFIDs. The part to be broken is provided.

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

  In addition, a notch is formed near the center of the base sheet 101, and the base sheet 101 is divided into a substantially rectangular region (breakable portion region) near the center and a region (circuit region) surrounding the substantially rectangular region. ing. In addition, a substantially rectangular area (breakable part area) near the center and an area (circuit area) surrounding the substantially rectangular area are connected by a connecting area.

  Passive RFIDs 110, 120, 130, 140, 150, 160, 170, 180, 190, and 1a0 use a memory 17b (storage unit), which will be described later, using electric power generated using radio waves received from an external communication device such as the RFID reader 7. ”Stored in“) ”is transmitted to the external communication device.

  Here, the passive RFIDs 110, 120, 130, 140, 150, 160, 170, 180, 190, and 1a0 are 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.

  Each passive RFID terminal 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 are respectively Electrical wiring (partially constituting the part to be broken) 115, 125, 135, 145, 155, 165, 175, 185, 195 and 1a5 is electrically connected. Specifically, as shown in FIG. 1, for example, terminals 173 and 174 of a passive RFID 170 are connected to one end and the other end of an electrical wiring 175 to form a circular electrical circuit. The annular electric circuit is also configured for all other passive RFIDs shown in FIG.

  As described above, the electric wirings 115, 125, 135, 145, 155, 165, 175, 185, 195 and 1a5 connected to the terminals of the passive RFIDs have a pattern as shown in FIG. 1 and FIG. A metal foil such as is patterned by a photo-etching method or the like.

  The electric wirings 115, 125, 135, 145, 155, 165, 175, 185, 195 and 1a5, which are patterned on the base sheet 101 as described above, are separated from the surroundings by the notches on the base sheet 101. In a substantially rectangular region (breakable portion region), the regions are arranged in a “predetermined direction” defined as the direction of crack propagation to be observed. Here, each wiring portion (see region 1t in FIG. 1) that is pattern-formed on a substantially rectangular region (breakable portion region) on the base sheet 101 corresponds to a “breakable portion”.

  Here, each of the electrical wirings 115, 125, 135, 145, 155, 165, 175, 185, 195 and 1a5 has a portion corresponding to the “breakable portion” in a direction substantially orthogonal to the “predetermined direction”. It is set so as to break when stretched by a predetermined length or more.

  Specifically, as shown in FIG. 4, for example, a plurality of parts to be broken are arranged in a direction (predetermined direction) in which the progress 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 object, as the crack 41 progresses, the crack sequentially traverses the to-be-broken portions of the wirings arranged in parallel. I will do it.

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

  The thickness and 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 by the crack on the surface of the observation object to which the base sheet 101 is bonded and the elongation rate of the material. The detection element 1 is designed to be disconnected quickly.

  The arrangement interval of each fractured part is determined based on the detection resolution of the progress of cracks. For example, when it is desired to observe the progress of cracks every 0.5 millimeters, the arrangement interval of each electric wiring constituting the fractured portion is also set to the same 0.5 millimeter width.

  In addition, in a region (circuit region) surrounding the 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. Etc. are arranged.

  A connection region (region connection portion) that connects a substantially rectangular region (a portion to be broken) of the base sheet 101 and a region (circuit region) surrounding the region has a width W in a direction orthogonal to the “predetermined direction”. The width K of the substantially rectangular area (breakable part area) of the base sheet 101 is narrower.

  By adopting such a configuration, the “breakable region” is independent of the “circuit region” by connecting the “breakable region” and the “circuit region” by the narrow “connecting region”. It is possible to progress in a direction perpendicular to the predetermined direction. That is, the influence of the deformation of the “part to be broken” accompanying the occurrence or development of a crack in the object does not reach the “circuit area”.

  In other words, the deformation of the “part to be broken” accompanying the occurrence or development of a crack is not suppressed by the “circuit area”, which can contribute to the improvement of the reliability of observation of the crack condition.

  In addition, among the wirings that electrically connect a plurality of “breakable portions” arranged in the “breakable portion region” and at least one of the passive RFIDs 170 to 1a0 arranged in the “circuit region” At least a part of the portion passing through the “connecting region” is patterned so as to extend in a direction different from the 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 in a direction orthogonal to the predetermined direction due to the influence of crack progress. Even when it extends, at least a part of the wiring passing through the connection region can reduce the influence of the extension. Therefore, when the connecting region extends in a direction orthogonal to the predetermined direction due to the influence of the progress of cracks, the wiring that passes through the connecting region does not break.

  In the crack observation sensor 1 according to the present embodiment, the passive RFID antenna is provided individually corresponding to each of the plurality of parts to be broken.

  In this way, by providing an antenna as a transmission / reception unit individually for each of the to-be-broken parts arranged in a plurality, even if any one of the antennas breaks down, at least signals with other antenna groups that have not failed The transmission and reception can be continued. Thereby, it can contribute to the improvement of the reliability as a sensor which observes generation | occurrence | production and progress, etc. of the crack of a target object.

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

  When adjacent antennas are arranged in parallel, one antenna may interfere with transmission / reception of the other antenna, which may affect communication. Therefore, by changing the direction of arrangement between adjacent antennas, it is avoided that adjacent antennas affect each other's reception performance.

  FIG. 5 is a diagram showing a basic configuration of each passive 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. As the RFID tag IC chip here, one having a so-called “disconnection detection terminal” and a function called tamper detection is adopted.

  The tamper detection function detects the presence or absence of disconnection between the disconnection detection terminals 173 and 174, and in accordance with the result, the state in the user area 31 of the memory 17b in the RFID tag IC chip as shown in FIG. The memory area of the flag 32 is set to “0” or “1”. Further, information indicating the “arrangement order” on the base sheet 101 of the “part to be broken” of the electric wiring 175 connected to the disconnection detection terminals 173 and 174 of the RFID chip is shown in the tag ID region 33 shown in FIG. Are stored in advance in a memory area of the rank code 34. Passive type RFID antenna 171 is formed on base sheet 101 with a desired antenna pattern by photoetching or the like, like aluminum foil having a thickness of about 10 to 30 microns, like the “breakable portion” of each electric wiring.

  With such a configuration, by acquiring information from the storage unit that stores the rupture status of a plurality of ruptured portions arranged, it is possible to grasp the occurrence status of cracks in the object and the progress status of cracks that have already occurred. can do. In addition, since the passive RFID is employed, it is not necessary to provide an AD conversion circuit, which can contribute to a reduction in power supply and a significant reduction in size of the entire sensor.

  FIG. 7 shows the relationship between the arrangement order of the “breakable parts” of each electric wiring in the predetermined direction on the base sheet 101 and the arrangement code. Eight passive RFIDs and 16 pairs corresponding thereto are shown. It is a figure which shows an example in case the to-be-broken part is arranged. Each data shown here is stored in each of the memories 11b, 12b, 13b, 13b, 15b, 16b, 17b, 18b, 19b included in each passive RFID 110, 120, 130, 140, 150, 160, 170, 180, 190 and 1a0. And data stored in 1ab. For example, the order code “3”, the break information “break”, and the break date “2014.06.02” are stored in the memory 14 b provided in the passive RFID 140. Here, the identification information of each RFID and the rank code are stored in association with each other, and the break information and the break date are written in the memory when the RFID reader 7 is read for the first time after actually breaking. It is. With respect to the break date and time, for example, the date and time information included in the signal received from the RFID reader 7 can be acquired on the RFID side, thereby making it possible to perform the association as shown in FIG.

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

  As a result, by acquiring “breaking information” and “array information” stored in each memory (storage unit), which of the to-be-broken parts arranged on the sheet is broken Can be determined.

  In addition, although the memory | storage part here associates and stores the fracture | rupture information of each of a some to-be-broken part, and the arrangement | sequence information of each to-be-broken part, it is not restricted to this. For example, the rupture information of each to-be-broken part is stored by associating unique identification information with each other, and pre-registered in an external database or the like, based on the association information of identification information and sequence information, It is also possible to determine at which position each piece of break information stored in the storage unit corresponds to the portion to be broken.

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

  As shown in the figure, in the crack observation sensor 1 according to the present embodiment, by providing a cutout in the base sheet 101, a rectangular “part to be broken” near the center of the sheet is separated from the surrounding “circuit area”. Almost independent. Therefore, by pasting only this rectangular “breakage area” to the location where the observation object is cracked or expected to be cracked, the “breakage area” is expanded due to the occurrence or progress of the crack. However, it does not affect the surrounding “circuit area”.

  Here, fixing (pasting) of the rectangular “part to be broken” in the vicinity of the center of the crack observation sensor 1 to the observation object can be realized by, for example, a double-sided tape or an adhesive. At this time, it is not always necessary to attach the entire surface of the “breakable region” to the observation object, and at least both ends in the “predetermined direction” of the “breakable region” may be fixed to the observation object. . As a result, it is possible to at least have a configuration in which the fractured portion extends due to the expansion of the surface of the observation object when the observation object is cracked or has progressed.

  Of course, the method of fixing the crack observation sensor 1 to the observation object here is an example, and the “circuit area” in the base sheet 101 is also fixed to the observation object, and the entire crack observation sensor 1 is attached to the observation object. If the fixation is desired to be strengthened, part or all of the “circuit area” of the base sheet 101 may be attached to the observation object.

  Next, the RFID reader 7 that communicates with the crack observation sensor will be described. FIG. 9 is a control block diagram provided in 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 (eg, 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. It goes without saying that the CPU 701 can be replaced by an MPU (Micro Processing Unit) capable of executing equivalent 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 RAM (Random Access Memory), a ROM (Read Only Memory), a DRAM (Dynamic Random Access Memory), an SRAM (Static Random Access Memory), a VRAM (Video RAM), a flash memory, and the like. The RFID reader 7 can store various information and programs.

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

  First, as shown in FIG. 1, a 920 MHz band interrogation radio wave 53 is received from an RFID reader 7 held by a worker on the ground several meters away from a crack observation sensor 1 installed on a concrete lining surface inside a tunnel. Transmit (ACT 101).

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

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

  In the memory 17b, as shown above, data as shown in FIG. 7 is stored in a non-volatile readable / writable memory area, and the logic unit 179 (information rewriting unit) is connected to the disconnection detection terminals 173 and 174. The presence / absence of breakage of the to-be-broken portion of the electrical wiring connected between them is detected, and if it is determined that the breakage has occurred, the status flag 32 (breakage information) in the memory 17b is set to “0 (not broken)” To “1 (disconnected)”.

  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 in the memory 17 b 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 binary corresponding to the binary data string (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 by the antenna 707 ( ACT103).

  Subsequently, the CPU 701 (determination unit) determines when the “first ruptured part” is ruptured based on the “breaking information”, “breaking 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 rupture portion” disposed adjacent to the first rupture portion ruptures is equal to or less than a predetermined time Th (ACT 104).

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

  Thus, by determining the case where the adjacent fractured part is broken at a time interval equal to or shorter than a predetermined time, it is possible to determine the presence or absence of a fast-growing crack. Further, if necessary, a warning notification can be given to the operator when the adjacent fractured part is broken at a time interval of a predetermined time or less.

  In this way, the backscatter response wave 54 is received by the RFID reader 7, and it is confirmed on the display 705 of the RFID reader 7 that the 0th to 4th of the arrangement order shown in FIG. , It is possible to grasp the degree of progress of the crack at each location.

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

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

  Note that a part or all of the program may be an execution module that is dynamically generated.

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

  In the above-described embodiment, the electrical wiring connected to the disconnection detection terminals of other RFIDs excluding some RFIDs (110, 150, 190, 1a0) is arranged with other electrical elements inside the electrical wiring. Does not constitute a closed loop. This is for the purpose of avoiding radio wave interference between RFIDs by changing the direction of the antenna between adjacent passive RFIDs, and when the circuit can be designed without worrying about radio wave interference. Is not limited to this.

  For example, when a plurality of n RFIDs are arranged on a base sheet, the (n-1) th RFID is included in a loop formed by an electrical wiring connected to the disconnection detection terminal of the nth (n is an integer) RFID. The loops of the RFIDs may be arranged in a multiplex structure so that the loop formed by the electrical wiring connected to the disconnection detection terminal is accommodated. Thus, by making a wiring pattern into a multiple structure, the space efficiency at the time of patterning wiring can be improved.

  In the above-described embodiment, the `` breaking information '' indicating the rupture status of each ruptured portion connected to the disconnection detection terminal of each RFID, and `` array information '' indicating the arrangement order of each ruptured portion, Although the configuration in which the information is stored in the memory provided in the RFID in association with each other is illustrated, the configuration is not limited thereto. For example, the RFID reader 7 stores a data table or the like indicating the correspondence between “RFID identification information” and “array information”, and is arranged at any position based on the received “RFID identification information”. You may make it determine what kind of fracture condition the to-be-broken part is in. That is, it is only necessary that the RFID reader 7 side obtains “RFID identification information”, “array information”, and “breaking information” as a result of the entire system.

  Moreover, in the above-described embodiment, the configuration in which the antenna is individually provided for each of the plurality of RFIDs arranged is exemplified. However, the configuration is not necessarily limited to this, and the crack observation sensor 1 as a whole is a single unit. It is good also as a structure provided with an antenna. That is, as a result, it is only necessary that the fracture information of the fractured part corresponding to each RFID can be transmitted to the RFID reader 7, and the number of antennas is not limited. If the crack observation sensor 1 is configured to have a single antenna as a whole, the problem of radio wave 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, the crack observation sensor that can collect data on the progress of cracking even from a reader device located several meters away does not require battery installation or wired power supply or the like. Can be provided.

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

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

(1) A crack observation sensor for observing cracks generated in an observation object,
A base sheet,
A plurality of parts to be broken that are arranged in a predetermined direction on the base sheet, and each breaks by being stretched by a predetermined length or more in a direction substantially orthogonal to the predetermined direction;
A storage unit;
An antenna,
A power generation unit that generates power using radio waves from an external communication device that is received by the antenna;
An information rewriting unit that stores, in the storage unit, rupture information indicating a rupture state of each of the plurality of ruptured parts, with electric power generated by the power generation unit,
A demodulator that demodulates the interrogation radio wave received by the antenna with 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;
Crack observation sensor equipped with.
(2) The storage unit stores the rupture information of each of the plurality of parts to be broken and the arrangement information indicating the arrangement order of the respective parts to be broken on the base sheet in the predetermined direction. Crack detection sensor according to 1).
(3) The base sheet is
A to-be-broken part region in which the plurality of to-be-broken parts are disposed;
A circuit region in which the storage unit, the information rewriting unit, the power generation unit, the antenna, the demodulator, and the modulator are disposed;
A connecting region that connects the to-be-broken portion region and the circuit region;
The crack observation sensor according to (1), wherein the connection region has a width in a direction orthogonal to the predetermined direction that is narrower than the fractured portion region.
(4) The plurality of parts to be broken arranged in the part to be broken and the storage unit arranged in the circuit area, the information rewriting unit, the power generation unit, the antenna, the demodulator, and the modulator The crack observation according to (3), wherein at least a part of a portion of the wiring that electrically connects at least one of the wirings passes through the connection region extends in a direction different from a direction orthogonal to the predetermined direction. Sensor.
(5) The crack observation sensor according to (1), wherein the antenna is individually provided corresponding to each of the plurality of broken portions.
(6) A first antenna and a second antenna adjacent to the first antenna among the plurality of antennas individually provided corresponding to the plurality of parts to be broken are arranged on the base sheet. The crack observation sensor according to (5), which is arranged in different directions so as not to be parallel.
(7) A plurality of to-be-breaked portions arranged in a predetermined direction on the base sheet and each set to be broken by being stretched by a predetermined length or more in a direction substantially orthogonal to the predetermined direction; Breaking information indicating the breaking state of each broken part, breaking time information indicating when the broken part is broken, and arrangement information indicating the arrangement order of the respective broken parts on the base sheet in the predetermined direction An RFID reader that performs communication with a crack observation sensor that includes a storage unit that stores the data in association with each other and an antenna that performs communication with an external communication device,
An antenna,
Based on a signal received from the RFID at the antenna, a signal acquisition unit that acquires the break information, the break time information, and the array information;
Based on the rupture information acquired by the signal acquisition unit, the rupture timing information, and the arrangement information, the timing at which the first ruptured portion is ruptured and the first ruptured portion arranged adjacent to the first ruptured portion. A determination unit for determining whether or not a time interval with a time when the to-be-ruptured portion of 2 is broken is equal to or less than a predetermined time;
An RFID reader comprising:
(8) A crack observation method for observing cracks in an observation object,
Stores rupture information indicating the rupture status of each of a plurality of ruptured parts arranged in a predetermined direction and each set to be ruptured 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 fracture information to the external device in accordance with a received radio wave from the external device.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the scope of claims, and is not restricted by the text of the specification. Further, all modifications, various improvements, alternatives 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 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 (5)

A substrate to be attached to the observation object;
A plurality of to-be-broken portions that are held by the base body and arranged at intervals in a first direction, and are electrically disconnected by deformation of the base body due to deformation of the observation object;
A plurality of RFIDs held on the base, connected to the to-be-broken portion, and using the electromotive force derived from the received radio wave as a power source, the presence or absence of disconnection of the to-be-broken portion to which it is connected and its own identification information When,
A disconnection detection sensor. The disconnection detection sensor according to claim 1,
Each annular electric wiring connected to the RFID connects the part to be broken, which is a part in a region where all the electric wirings connected to the RFID are arranged in the first direction, and the part to be broken and the RFID. A wiring connection portion to be
The base has an annular cutout that surrounds the plurality of parts to be broken, and the plurality of RFIDs are outside a region surrounded by the cutout in the base, and the cutout includes The disconnection detection sensor which has the opening part which the said wiring connection part extended over the inner side and the outer side of the said area | region passes. In the disconnection detection sensor according to claim 1 or 2,
The plurality of RFIDs have a plurality of sets of two RFIDs that are parallel to each other and are located on a point object around the plurality of broken parts,
Each set is located annularly around the plurality of fractured parts,
The disconnection detection sensor which is an attitude | position which the said RFID of the said adjacent group cross | intersects in the circumferential direction centering on these some to-be-broken parts. In the disconnection detection sensor according to any one of claims 1 to 3,
The disconnection detection sensor, wherein the base is a flat insulating material. It is held by a base that is attached to the observation object and arranged at intervals in the first direction, and is connected to a to-be-broken portion that is electrically disconnected by deformation of the base due to deformation of the observation object, and is held by the base A method of transmitting a crack progress state by a plurality of RFIDs having a memory,
Each RFID is
Receive radio waves from the reader,
In the case where the ruptured portion is ruptured, if the ruptured portion is not stored in the memory as being ruptured, the ruptured portion is broken in the memory, and the ruptured portion Store the time information in the radio wave as the break time of the part,
The presence or absence of breakage of the broken portion and the break time are transmitted to the reader
How to send crack progress information.