RFID tag sensor and RFID electromagnetic sensor system

Abstract

The invention provides an RFID tag sensor and an RFID electromagnetic sensor system, and belongs to the technical field of detection, and the RFID tag sensor comprises a first dielectric substrate and a second dielectric substrate; a microwave antenna; a first RFID tag chip and a second RFID tag chip; the first feeder network and the second feeder network are orthogonally arranged between the bottom surface of the first dielectric substrate and the top surface of the second dielectric substrate, the first feeder network connects the first RFID tag chip with the microwave antenna, and the second feeder network connects the second RFID tag chip with the microwave antenna. And the second feeder network is used for connecting the second RFID tag chip with the microwave antenna. According to the RFID tag sensor provided by the invention, the technical problem that the crack detection result of the structure surface is inaccurate in the RFID tag sensor in the related technology is solved.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to an RFID tag sensor and an RFID electromagnetic sensor system. Background Art

[0002] As structures are subjected to different operating and environmental loads, fatigue and structural deformation will occur over a period of time. In critical applications of large structures such as spacecraft and aircraft, early identification and characterization of structural damage is very important. Mechanical failure is related to fatigue crack growth, which may lead to the overall failure of the structure.

[0003] In order to detect cracks on the surface of the structure, a radio frequency identification (RFID) tag sensor can be used to detect cracks on the surface of the structure. The RFID tag sensor in the related technology has a single working mode and can only detect cracks in a single direction on the surface of the structure.

[0004] It can be seen that the RFID tag sensor in the related art has a technical problem of inaccurate crack detection results on the surface of the structure. Summary of the invention

[0005] The present invention provides an RFID tag sensor and an RFID electromagnetic sensor system, which are used to solve the technical problem that the RFID tag sensor in the related art has inaccurate crack detection results on the structure surface.

[0006] The present invention provides an RFID tag sensor, comprising: a first dielectric substrate and a second dielectric substrate, wherein the top surface of the second dielectric substrate is bonded to the bottom surface of the first dielectric substrate; a microwave antenna, wherein the microwave antenna is arranged between the first dielectric substrate and the second dielectric substrate; a first RFID tag chip and a second RFID tag chip, wherein the first RFID tag chip is arranged on the top surface of the first dielectric substrate, and the second RFID tag chip is arranged on the top surface of the second dielectric substrate; a first feeder network and a second feeder network, wherein the first feeder network and the second feeder network are orthogonally arranged between the bottom surface of the first dielectric substrate and the top surface of the second dielectric substrate, wherein the first feeder network connects the first RFID tag chip to the microwave antenna, and wherein the second feeder network connects the second RFID tag chip to the microwave antenna.

[0007] According to an RFID tag sensor provided by the present invention, the microwave antenna is a rectangular patch antenna.

[0008] According to an RFID tag sensor provided by the present invention, the first dielectric substrate and the second dielectric substrate are both made of RT / duroid 5880 material, and the dielectric constants of the first dielectric substrate and the second dielectric substrate are 2.2 and the loss tangent is 0.0009.

[0009] According to an RFID tag sensor provided by the present invention, the RFID tag sensor further includes four lumped capacitors, and the lumped capacitors are connected to the outer edges of the rectangular patch antenna.

[0010] The present invention also provides an RFID electromagnetic sensor system, comprising any one of the above-mentioned RFID tag sensors, an RFID reader antenna and a controller, wherein the RFID tag sensor, the RFID reader antenna and the controller are communicatively connected to each other.

[0011] The present invention also provides a control method for an RFID electromagnetic sensor system, which is applied to any one of the above-mentioned RFID electromagnetic sensor systems, and the method comprises: the controller sends a detection instruction to the RFID reader antenna; in response to the detection instruction, the RFID reader antenna sends a target electromagnetic wave with a modulation information instruction to the RFID tag sensor; the microwave antenna generates a target electromagnetic field in response to the target electromagnetic wave to excite the first feeder network and the second feeder network; the first feeder network transfers the energy of the target electromagnetic field to the first RFID tag chip, and the first RFID tag chip sends a first signal containing first sensing information to the RFID reader antenna through the first feeder network and the microwave antenna; the second feeder network transfers the energy of the target electromagnetic field to the second RFID tag chip, and the second RFID tag chip sends a second signal containing second sensing information to the RFID reader antenna through the second feeder network and the microwave antenna; the direction and depth of the crack are determined based on the first signal and the second signal, wherein the first signal and the second signal are used to reflect crack information in different directions.

[0012] According to a control method of an RFID electromagnetic sensor system provided by the present invention, determining the direction and depth of a crack based on the first signal and the second signal includes: acquiring target resonant frequency data of the first signal and the second signal; inputting the target resonant frequency data into a preset database for retrieval to obtain a target crack direction and a target crack depth, wherein the preset database is used to reflect the relationship between the resonant frequency data and the crack direction and the crack depth.

[0013] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the RFID tag sensor described above is implemented.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the RFID tag sensor described above is implemented.

[0015] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the RFID tag sensor described above is implemented.

[0016] The RFID tag sensor and RFID electromagnetic sensor system provided by the present invention can excite two independent radiation modes, respectively having resonant frequencies f1 and f2, because the first feeder network and the second feeder network are orthogonally arranged between the bottom surface of the first dielectric substrate and the top surface of the second dielectric substrate, wherein the direction of the current generated at the frequency point f1 is perpendicular to the direction of the current generated at the frequency point f2, and the direction and depth of the crack can be determined based on the resonant frequency of the signal returned by the RFID tag sensor, thereby solving the technical problem of inaccurate crack detection results on the surface of the structure in the RFID tag sensor in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced one by one below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is one of the structural schematic diagrams of the RFID tag sensor provided by the present invention.

[0019] Figure 2 This is the second structural schematic diagram of the RFID tag sensor provided by the present invention.

[0020] Figure 3 It is a flow chart of the control method of the RFID electromagnetic sensor system provided by the present invention.

[0021] Figure 4 It is a schematic diagram of the control method of the RFID electromagnetic sensor system provided by the present invention.

[0022] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention.

[0023] Figure numerals: 1-structure surface; 2-crack; 3-RFID tag sensor; 4-first dielectric substrate; 5-second dielectric substrate; 6-rectangular patch antenna; 7-first feeder network; 8-second feeder network; 9-microstrip line; 10-lumped capacitor. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that in the description of the present invention, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "include one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. The orientation or position relationship indicated by the terms "upper", "lower" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" means at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0027] As structures are subjected to different operating and environmental loads, fatigue and structural deformation will occur over a period of time, which may lead to disasters or property losses. In critical applications of large structures such as spacecraft and aircraft, early identification and characterization of structural damage is very important. Mechanical failure is related to fatigue crack growth, which may lead to the overall failure of the structure. Traditional contact and non-contact detection technologies are mostly based on periodic detection methods, which are cumbersome and time-consuming for monitoring large structures. Therefore, in-situ structural health monitoring is essential for early detection, location and characterization of impending cracks. Unlike traditional wired sensors that are connected to data acquisition and processing equipment through physical wires or cables, which requires a lot of wiring, increasing cost and complexity, wireless sensors have the advantages of low installation cost, compact structure and no need for cables.

[0028] Due to the rapid development of the Internet of Things and the continuous reduction of integrated circuit power consumption, passive wireless sensors are becoming more and more needed to ensure lifelong monitoring of structures. The design limitations associated with the development of passive wireless sensors are power management and the acquisition capabilities of the sensors. Among wireless sensor technologies, radio frequency identification technology, which uses electromagnetic waves to transmit data, is considered suitable for manufacturing low-cost passive wireless sensors. RFID tag sensors have attracted the attention of domestic and foreign scholars for their advantages such as wireless and simple measurement equipment. They are a detection technology that overcomes the complex wiring, high cable cost and maintenance cost of traditional wired sensor networks.

[0029] According to the RFID microstrip antenna model, that is, the microstrip antenna cavity model, when the microstrip patch antenna (length L and width W) is installed on the surface of the metal structure to be tested, electromagnetic resonance will produce one of the two working modes, namely TM01 mode and TM10 mode; among them, in the TM01 working mode, the current magnitude on the upper and lower surfaces of the cavity model is distributed sinusoidally along the width direction, and the current density value is the largest at W / 2; when the microstrip antenna works in the TM10 mode, the current magnitude on the upper and lower surfaces of the cavity model in this working mode is distributed sinusoidally along the length direction, and the current density value is the largest at L / 2. The existing crack detection theory is that the current path of the antenna is affected by the surface cracks, and the current path length needs to be increased to affect the resonant frequency of the sensor. Assuming that the longitudinal crack is parallel to the TM01 resonance mode, it will not affect the current path of the TM01 resonance mode, so the longitudinal crack cannot be detected but the transverse crack can be detected. Therefore, due to the single working mode, the existing RFID microstrip antenna has the defect of only being able to detect cracks in a single direction. It can be seen that the RFID tag sensor in the related art has a technical problem of inaccurate crack detection results on the surface of the structure.

[0030] In order to at least solve some of the above problems, the following Figure 1-Figure 5The RFID tag sensor and RFID electromagnetic sensor system provided by the present invention are described.

[0031] Figure 1 FIG. 1 is one of the structural schematic diagrams of the RFID tag sensor provided by the present invention, such as Figure 1 As shown, the RFID tag sensor comprises: A first dielectric substrate 4 and a second dielectric substrate 5, wherein the top surface of the second dielectric substrate is bonded to the bottom surface of the first dielectric substrate; A microwave antenna, wherein the microwave antenna is disposed between the first dielectric substrate and the second dielectric substrate; A first RFID tag chip and a second RFID tag chip, wherein the first RFID tag chip is disposed on the top surface of the first dielectric substrate, and the second RFID tag chip is disposed on the top surface of the second dielectric substrate; A first feeder network 7 and a second feeder network 8, wherein the first feeder network and the second feeder network are orthogonally arranged between the bottom surface of the first dielectric substrate and the top surface of the second dielectric substrate, the first feeder network connects the first RFID tag chip with the microwave antenna, and the second feeder network connects the second RFID tag chip with the microwave antenna.

[0032] Optionally, the microwave antenna is a rectangular patch antenna 6; the rectangular patch antenna is a planar structure and is easy to integrate into planar circuits and systems. The rectangular patch antenna usually has a directional radiation characteristic, and the main lobe direction depends on the size and shape of the patch.

[0033] Optionally, both the first dielectric substrate and the second dielectric substrate are made of RT / duroid 5880 material, and the dielectric constants of the first dielectric substrate and the second dielectric substrate are 2.2, and the loss tangents are 0.0009.

[0034] It can be understood that both the first dielectric substrate and the second dielectric substrate are RT / duroid 5880, which can improve the signal transmission efficiency. Due to the low dielectric constant and low loss tangent of RT / duroid 5880, it can effectively improve the signal transmission efficiency in the RFID system and reduce the signal attenuation during transmission. In the RFID system, the antenna is a key part of signal transmission and reception. The stable physical and electrical properties of RT / duroid 5880 help maintain the stability of antenna performance, which is crucial for accurate monitoring of crack direction. The low dielectric constant of RT / duroid 5880 allows the design of a smaller antenna size, which is very useful for reducing the size and weight of the entire sensor system, especially in applications that require lightweight or space-constrained applications. RT / duroid 5880 materials generally have good heat resistance and mechanical strength, which makes the sensor system more durable and able to work stably in various environments.

[0035] Optionally, the RFID tag sensor further includes a grounding plate, and the grounding plate is arranged on the bottom surface of the second dielectric substrate.

[0036] Optionally, the RFID tag sensor also includes four lumped capacitors 10, and the lumped capacitors are connected to the outer edges of the rectangular patch antenna; here, the lumped capacitors are used to enable the RFID tag sensor to operate in a specified RFID frequency band (to facilitate the chip operation and thus wireless signal reading), and the predetermined operating frequency band can be arbitrarily adjusted through the capacitors.

[0037] Optional, such as Figure 1 As shown, the RFID tag sensor also includes a microstrip line 9, which is used to connect the rectangular patch antenna with the first feeder network and the second feeder network. The microstrip line can also be regarded as a part of the first feeder network and the second feeder network. The microstrip line has the same material and function as the first feeder network and the second feeder network.

[0038] Figure 2 FIG. 2 is a second structural diagram of the RFID tag sensor provided by the present invention. Figure 2 As shown, the RFID tag sensor 3 is placed on the structural surface 1. When there is a crack 2 in the coverage area of ​​the RFID tag sensor, the crack will change the electrical characteristics of the microwave antenna, such as the impedance of the antenna. Therefore, the starting power of the first RFID tag chip and the second RFID tag chip will be affected. The change in the starting power of the chip will be mapped to the microwave antenna and sent out through the microwave antenna in the form of a radio frequency signal.

[0039] It can be understood that since the first feeder network and the second feeder network are orthogonally arranged between the bottom surface of the first dielectric substrate and the top surface of the second dielectric substrate, two independent radiation modes can be excited, with resonant frequencies f1 and f2 respectively, wherein the direction of the current generated at the frequency point f1 is perpendicular to the direction of the current generated at the frequency point f2. For the same crack, the starting power is affected differently, and the resonant frequency of the radio frequency signal sent by the microwave antenna will also be different, and then the direction and depth of the crack can be determined based on the resonant frequency of the signal returned by the RFID tag sensor.

[0040] It should be noted that the first feeder network and the second feeder network are orthogonally arranged between the bottom surface of the first dielectric substrate and the top surface of the second dielectric substrate, but the first feeder network and the second feeder network are not limited to only one layer of a certain substrate. The first feeder network and the second feeder network can be connected to other components through electrical connections. For example, the first feeder network connects the first RFID tag chip arranged on the top surface of the first dielectric substrate to the microwave antenna arranged between the first dielectric substrate and the second dielectric substrate through electrical connections.

[0041] Through the embodiments provided by the present application, since the first feeder network and the second feeder network are orthogonally arranged between the bottom surface of the first dielectric substrate and the top surface of the second dielectric substrate, two independent radiation modes can be excited, respectively having resonant frequencies f1 and f2, wherein the direction of the current generated at the frequency point f1 is perpendicular to the direction of the current generated at the frequency point f2, and the direction and depth of the crack can be determined based on the resonant frequency of the signal returned by the RFID tag sensor, thereby solving the technical problem of inaccurate crack detection results on the surface of the structure of the RFID tag sensor in the related art, and improving the accuracy of the crack detection results on the surface of the structure.

[0042] The present invention also provides an RFID electromagnetic sensor system, comprising any one of the above-mentioned RFID tag sensors, an RFID reader antenna and a controller, wherein the RFID tag sensor, the RFID reader antenna and the controller are communicatively connected to each other.

[0043] In this embodiment, the RFID reader antenna and the RFID tag sensor communicate bidirectionally, and the controller is used to control the operation of the RFID tag sensor and the RFID reader antenna; the RFID tag sensor is used to receive RFID reader antenna instruction information and send the sensing information of the RFID tag sensor to the RFID reader antenna.

[0044] The present invention also provides a control method for an RFID electromagnetic sensor system, the method being applied to any of the above-mentioned RFID electromagnetic sensor systems. Figure 3 FIG. 1 is a flow chart of a control method of an RFID electromagnetic sensor system provided by the present invention, such as Figure 3 As shown, the method includes: Step 301, the controller sends a detection instruction to the RFID reader antenna; Step 302, in response to the detection instruction, the RFID reader antenna sends a target electromagnetic wave with a modulation information instruction to the RFID tag sensor; Step 303: The microwave antenna generates a target electromagnetic field in response to the target electromagnetic wave to excite the first feeder network and the second feeder network; Step 304: the first feeder network transmits the energy of the target electromagnetic field to the first RFID tag chip, and the first RFID tag chip sends a first signal containing first sensing information to the RFID reader antenna through the first feeder network and the microwave antenna; Step 305: the second feeder network transmits the energy of the target electromagnetic field to the second RFID tag chip, and the second RFID tag chip sends a second signal containing second sensing information to the RFID reader antenna through the second feeder network and the microwave antenna; Step 306: determine the direction and depth of the crack based on the first signal and the second signal, wherein the first signal and the second signal are used to reflect crack information in different directions.

[0045] The control method of the RFID electromagnetic sensor system in this embodiment may be executed by the RFID electromagnetic sensor system, and specifically, may be executed by a controller.

[0046] In actual application, a sample to be detected for surface cracks is placed above a metal plate, the RFID tag sensor is placed above the sample, the RFID reader antenna is located directly above the RFID tag sensor, and the distance between the RFID reader antenna and the RFID tag sensor is fixed.

[0047] Furthermore, the controller sends instructions to the RFID reader antenna, and the RFID reader antenna sends electromagnetic waves with modulation information instructions to the RFID tag sensor. The rectangular patch antenna is excited by the electromagnetic waves, generates a corresponding electromagnetic field and excites the first feeder network and the second feeder network to supply energy to the two RFID tag chips. The appearance of cracks in the sample to be detected for surface cracks affects the impedance of the RFID tag antenna. This influence is mapped to the starting power of the chip and sent back to the RFID reader antenna through the RFID tag antenna (rectangular patch antenna). Finally, the application system collects and analyzes the data.

[0048] Optionally, determining the direction and depth of the crack based on the first signal and the second signal includes: Acquire target resonant frequency data of the first signal and the second signal; The target resonant frequency data is input into a preset database for retrieval to obtain a target crack direction and a target crack depth, wherein the preset database is used to reflect the relationship between the resonant frequency data, the crack direction and the crack depth.

[0049] Figure 4 is a schematic diagram of a control method of an RFID electromagnetic sensor system provided by the present invention, Figure 4 The simulation results of cracks with different depths and directions are shown in Figure 2. Figure 4 As shown, the horizontal axis is the crack depth, and the vertical axis is the resonant frequency of the two ports. It should be noted that port 1 corresponds to the first signal and port 2 corresponds to the second signal. Figure 4 It can be seen that for cracks in the same direction, the resonance frequencies of the first signal and the second signal are different. Therefore, the direction and depth of the crack can be determined according to the resonance frequencies of the first signal and the second signal.

[0050] In this embodiment, the chips of ports 1 and 2 can be independently controlled to be turned on and activated wirelessly through the RFID reader antenna; the target resonant frequency data can be input into a preset database for retrieval to obtain the target crack direction and target crack depth.

[0051] Here, a preset database needs to be determined in advance; specifically, representative crack directions and crack depths are numerically calculated or tested to form a data combination of resonant frequencies (e.g. Figure 4 , there is a one-to-one correspondence between the resonant frequency, crack direction and crack depth, forming a corresponding preset database).

[0052] Furthermore, an RFID tag sensor is installed on the surface of the object to be tested; the RFID reader wirelessly opens port 1 and port 2 respectively to obtain the characteristics of the target resonant frequency; the target resonant frequency is input into a preset database for retrieval to obtain the target crack direction and target crack depth.

[0053] Through this embodiment, the accuracy of determining the crack direction and depth can be improved, thereby improving the accuracy and reliability of the control method of the RFID electromagnetic sensor system of this embodiment.

[0054] Figure 5 is a schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 5As shown, the electronic device may include: a processor (processor) 510, a communication interface (Communications Interface) 520, a memory (memory) 530 and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 can call the logic instructions in the memory 530 to execute the control method of the RFID electromagnetic sensor system, which includes: the controller sends a detection instruction to the RFID reader antenna; in response to the detection instruction, the RFID reader antenna sends a target electromagnetic wave with a modulation information instruction to the RFID tag sensor; the microwave antenna generates a target electromagnetic field in response to the target electromagnetic wave to excite the first feeder network and the second feeder network; the first feeder network transfers the energy of the target electromagnetic field to the first RFID tag chip, and the first RFID tag chip sends a first signal containing first sensing information to the RFID reader antenna through the first feeder network and the microwave antenna; the second feeder network transfers the energy of the target electromagnetic field to the second RFID tag chip, and the second RFID tag chip sends a second signal containing second sensing information to the RFID reader antenna through the second feeder network and the microwave antenna; the direction and depth of the crack are determined based on the first signal and the second signal, wherein the first signal and the second signal are used to reflect crack information in different directions.

[0055] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0056] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the control method of the RFID electromagnetic sensor system provided by the above embodiments, the method comprising: the controller sends a detection instruction to the RFID reader antenna; in response to the detection instruction, the RFID reader antenna sends a target electromagnetic wave with a modulation information instruction to the RFID tag sensor; the microwave antenna responds to the target electromagnetic wave to generate a target electromagnetic field to excite the first feeder network and the second feeder network; the first feeder network transfers the energy of the target electromagnetic field to the first RFID tag chip, and the first RFID tag chip sends a first signal containing first sensing information to the RFID reader antenna through the first feeder network and the microwave antenna; the second feeder network transfers the energy of the target electromagnetic field to the second RFID tag chip, and the second RFID tag chip sends a second signal containing second sensing information to the RFID reader antenna through the second feeder network and the microwave antenna; the direction and depth of the crack are determined based on the first signal and the second signal, wherein the first signal and the second signal are used to reflect crack information in different directions.

[0057] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the control method of the RFID electromagnetic sensor system provided in the above-mentioned embodiments, the method comprising: the controller sends a detection instruction to the RFID reader antenna; in response to the detection instruction, the RFID reader antenna sends a target electromagnetic wave with a modulation information instruction to the RFID tag sensor; the microwave antenna generates a target electromagnetic field in response to the target electromagnetic wave to excite the first feeder network and the second feeder network; the first feeder network transfers the energy of the target electromagnetic field to the first RFID tag chip, and the first RFID tag chip sends a first signal containing first sensing information to the RFID reader antenna through the first feeder network and the microwave antenna; the second feeder network transfers the energy of the target electromagnetic field to the second RFID tag chip, and the second RFID tag chip sends a second signal containing second sensing information to the RFID reader antenna through the second feeder network and the microwave antenna; the direction and depth of the crack are determined based on the first signal and the second signal, wherein the first signal and the second signal are used to reflect crack information in different directions.

[0058] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0059] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An RFID tag sensor, characterized in that: include: A first dielectric substrate and a second dielectric substrate, wherein a top surface of the second dielectric substrate is bonded to a bottom surface of the first dielectric substrate; A microwave antenna, wherein the microwave antenna is disposed between the first dielectric substrate and the second dielectric substrate; A first RFID tag chip and a second RFID tag chip, wherein the first RFID tag chip is disposed on the top surface of the first dielectric substrate, and the second RFID tag chip is disposed on the top surface of the second dielectric substrate; A first feeder network and a second feeder network, wherein the first feeder network and the second feeder network are orthogonally arranged between the bottom surface of the first dielectric substrate and the top surface of the second dielectric substrate, the first feeder network connects the first RFID tag chip with the microwave antenna, and the second feeder network connects the second RFID tag chip with the microwave antenna.

2. The RFID tag sensor according to claim 1, characterized in that: The microwave antenna is a rectangular patch antenna.

3. The RFID tag sensor according to claim 1, characterized in that: The first dielectric substrate and the second dielectric substrate are both made of RT / duroid 5880 material, and the dielectric constants of the first dielectric substrate and the second dielectric substrate are 2.2 and the loss tangents are 0.0009.

4. The RFID tag sensor according to claim 2, characterized in that: The RFID tag sensor also includes four lumped capacitors, and the lumped capacitors are connected to the outer edges of the rectangular patch antenna.

5. An RFID electromagnetic sensor system, characterized in that: It comprises the RFID tag sensor as claimed in any one of claims 1 to 4, as well as an RFID reader antenna and a controller, wherein the RFID tag sensor, the RFID reader antenna and the controller are communicatively connected with each other.

6. A control method for an RFID electromagnetic sensor system, characterized in that: The method is applied to the RFID electromagnetic sensor system as claimed in claim 5, and the method comprises: The controller sends a detection instruction to the RFID reader antenna; In response to the detection instruction, the RFID reader antenna sends a target electromagnetic wave with a modulation information instruction to the RFID tag sensor; The microwave antenna generates a target electromagnetic field in response to the target electromagnetic wave to excite the first feeder network and the second feeder network; The first feeder network transfers the energy of the target electromagnetic field to the first RFID tag chip, and the first RFID tag chip sends a first signal containing first sensing information to the RFID reader antenna through the first feeder network and the microwave antenna; The second feeder network transfers the energy of the target electromagnetic field to the second RFID tag chip, and the second RFID tag chip sends a second signal containing second sensing information to the RFID reader antenna through the second feeder network and the microwave antenna; The direction and depth of the crack are determined based on the first signal and the second signal, wherein the first signal and the second signal are used to reflect crack information in different directions.

7. The control method of the RFID electromagnetic sensor system according to claim 6, characterized in that: The determining the direction and depth of the crack based on the first signal and the second signal comprises: Acquire target resonant frequency data of the first signal and the second signal; The target resonant frequency data is input into a preset database for retrieval to obtain a target crack direction and a target crack depth, wherein the preset database is used to reflect the relationship between the resonant frequency data, the crack direction and the crack depth.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the control method of the RFID electromagnetic sensor system according to any one of claims 6 to 7 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the RFID electromagnetic sensor system according to any one of claims 6 to 7 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the control method of the RFID tag sensor RFID electromagnetic sensor system according to any one of claims 6 to 7 is implemented.

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