CN110749272A - Passive wireless crack sensor based on short-circuit patch antenna and sensing system - Google Patents
Passive wireless crack sensor based on short-circuit patch antenna and sensing system Download PDFInfo
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- CN110749272A CN110749272A CN201910929879.0A CN201910929879A CN110749272A CN 110749272 A CN110749272 A CN 110749272A CN 201910929879 A CN201910929879 A CN 201910929879A CN 110749272 A CN110749272 A CN 110749272A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
Abstract
The application belongs to the field of structural deformation monitoring and provides a passive wireless crack sensor and a sensing system based on a short-circuit patch antenna. The crack sensor comprises a lower radiation patch, a substrate, an upper radiation patch, an RFID chip, a short-circuit patch, a mobile substrate, a connecting line and a connecting plate; the lower radiation patch is attached to the lower surface of the substrate; the upper radiation patch is attached to the upper surface of the substrate; the RFID chip is welded on the upper surface of the substrate and is communicated with the upper radiation patch; the short-circuit patch is attached to the lower surface of the movable substrate; the upper part and the lower part of the short-circuit patch and the upper radiation patch are overlapped and short-circuited, the width of the short-circuit patch is equal to that of the upper radiation patch, and the short-circuit patch and the upper radiation patch are not in any rigid connection mode; the overlapping part of the short-circuit patch and the upper radiation patch forms a large radiation patch; one side of the movable substrate, which is far away from the upper radiation patch, is connected with the connecting plate through a connecting wire, the movable substrate is pasted on the connecting wire, and the connecting wire is pasted on the connecting plate through glue.
Description
Technical Field
The application belongs to the structural deformation monitoring field, and especially provides a passive wireless crack sensor and sensing system based on short-circuit patch antenna.
Background
Important engineering structures such as buildings and bridges are gradually degraded in performance over time under the action of service load and environment, and a large number of structural health monitoring researches are developed in the last decades in order to accurately evaluate the structural deterioration. Sensors, which are critical components of a structural health monitoring system, can detect various parameters such as strain, crack and acceleration, which provide reliable basis for the evaluation of structural performance. In structural members, cracks can directly reflect the damage state of a structure, and are important parameters in the evaluation of structures. In a concrete structure, factors such as structural load, temperature change, uneven settlement and the like can cause the structure to generate cracks, and the cracks can accelerate the carbonization of concrete and the corrosion of reinforcing steel bars, reduce the bearing capacity of the structure and influence the performance of the structure; for steel structures, cracks are usually created by reciprocating loads, and fatigue failure occurs once the critical length is reached.
At present, in the field of structural deformation monitoring, the widely applied structural crack sensors are mainly crack width instruments and ultrasonic tests. The traditional crack sensor has the advantages of good test effect, high resolution and the like, but relatively, the method only carries out detection in a certain fixed period, and the crack can be expanded to a dangerous width in a range before detection; at the same time, such sensors typically require coaxial lines for their power supply and signal transmission. For a sensing system, a large number of coaxial lines increase the installation difficulty, and more manpower and material resources are consumed. More fatal, when natural disasters such as earthquake, flood and the like occur, the coaxial line is very easy to damage, so that the sensing system can not work normally.
Among the above improvements of the slit sensor, the slit sensor based on an antenna is relatively representative. The crack sensor based on the antenna can realize passive wireless sensing, but the current crack sensor based on the antenna mainly takes qualitative measurement as a main part, cannot achieve quantitative measurement, and is limited in practical application.
Disclosure of Invention
The utility model provides a passive wireless crack sensor and sensing system based on short circuit formula patch antenna, can avoid the coaxial line shortcoming in the healthy monitoring system of structure, eliminate antenna substrate transmission efficiency's influence, monitoring structure crack width that can be reliable, accurate overcome prior art not enough, provide.
In order to achieve the above object, the present application provides the following technical solutions:
a passive wireless RFID crack sensor based on a short-circuit patch antenna comprises a first component, a second component and a third component; the first assembly comprises a lower radiation patch, a substrate, an upper radiation patch and an RFID chip, the second assembly comprises a short-circuit patch and a movable substrate, and the third assembly comprises a connecting line and a connecting plate;
the lower radiation patch is tightly electroplated and attached to the lower surface of the substrate, and the lower radiation patch completely covers the lower surface of the substrate; the upper radiation patch is closely attached to the upper surface of the substrate in an electroplating way; the RFID chip is welded on the upper surface of the substrate and is communicated with the upper radiation patch through welding.
The short-circuit patch is closely attached to the lower surface of the movable substrate in an electroplating manner; the second assembly is arranged on the first assembly, so that the short-circuit patch and the upper radiation patch are close to the upper part and the lower part to be overlapped and short-circuited, the short-circuit patch and the upper radiation patch are equal in width, but the short-circuit patch and the upper radiation patch are not in any rigid connection mode, and the upper radiation patch and the short-circuit patch can be guaranteed to be in mutual dislocation; the overlapping part of the short-circuit patch and the upper radiation patch forms a large radiation patch;
one side of the movable substrate, which is far away from the upper radiation patch, is connected with the connecting plate through a connecting wire, the movable substrate is pasted on the connecting wire, and the connecting wire is pasted on the connecting plate through glue.
Furthermore, the first component is adhered to one side of the structure, and the second component is connected with the third component and is connected with the other side of the structure through a connecting plate. When the structure both sides produce relative displacement because of the crack, subassembly one just produces relative displacement with subassembly two for relative dislocation takes place between short circuit paster and the last radiation paster, thereby leads to big radiation paster length change, thereby changes sensing system's resonant frequency.
In the application, the lower radiation patch, the upper radiation patch and the short-circuit patch are all made of copper; the substrate and the movable substrate both adopt RT5880 dielectric plates; the connecting wires and the connecting plate are made of materials with close dielectric constants, such as foam, so as to reduce the influence on an electromagnetic field induced by the antenna.
The application also provides a passive wireless crack sensing system based on the short-circuit patch antenna, which comprises a crack sensor, an RFID reader and a data acquisition device; the crack sensor is a passive wireless crack sensor based on a short-circuit patch antenna, and a first component in the crack sensor is used as an RFID label; the RFID reader is provided with a transmitting antenna and is communicated with the RFID tag through the transmitting antenna; meanwhile, the data acquisition device is also in communication connection with the RFID reader.
Further, the RFID chip 4 of the RFID tag carries the encoding information of the tag, the RFID reader 11 is used for emitting modulated electromagnetic wave signals to the tag, the encoding of the tag can be identified, and when a plurality of RFID tags are arranged in the scanning range of the RFID reader, the reader can mark the crack width value of each measuring point according to the encoding of each tag.
In the crack measurement, the large radiation patch functions as a sensing unit. When a crack occurs in the structure, the first component (label) and the second component (label) which are adhered to two ends of the crack of the structure generate relative displacement with the third component, and relative dislocation occurs between the short-circuit patch 5 and the upper radiation patch 1, so that the length of the large radiation patch is increased, and the resonant frequency of the first component drifts; the RFID reader can detect the resonant frequency drift of the first component and send the resonant frequency drift to the data acquisition device 12; and the data acquisition device 12 calculates the crack width according to the resonant frequency shift of the first component.
Furthermore, the performance of the crack sensing system is related to the type of the antenna on the label, the size of the upper radiation patch 3 and the width of the short patch 5 are optimized, and the sensitivity of the crack sensing system can be improved.
Compared with the prior art, the beneficial effects of this application are:
(1) the patch antenna can sense the change of the crack, and the drift amount of the resonant frequency of the patch antenna has a definite relation with the width of the crack, so that the quantitative measurement of the resonant frequency is realized;
(2) the detection equipment can wirelessly detect the drift amount of the resonant frequency of the antenna, and accordingly, the relative displacement experienced by the structure is calculated, and the wireless detection of the crack width is realized;
(3) the detection equipment can activate the patch antenna to work through electromagnetic waves, and the sensor is passive without an additional power supply;
(4) the chip can store simple information such as the ID, the position and the like of the patch antenna.
(5) The passive wireless displacement sensor based on the patch antenna greatly reduces the manufacturing cost of the sensor;
(6) the deformation that the research of the same kind of contrast adopted the antenna body is as the measurement volume, and this application adopts the mode of measuring relative displacement, better has prevented that the bottom from pasting powerful glue and crackle randomness to the influence of measuring result.
Drawings
Fig. 1 is a schematic diagram of a passive wireless crack sensor based on a shorted patch antenna according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a first component provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a second assembly provided in an embodiment of the present application;
FIG. 4 is a schematic diagram of a third assembly provided by an embodiment of the present application;
fig. 5 is a schematic diagram of a passive wireless crack sensing system based on a shorted patch antenna according to an embodiment of the present application.
Description of the reference numerals
The device comprises a lower radiation patch 1, a substrate 2, an upper radiation patch 3, a chip 4, a short-circuit patch 5, a movable substrate 6, a connecting line 7, a connecting plate 8, a crack sensor 9, a transmitting antenna 10, a reader 11 and a data acquisition device 12.
Detailed Description
The technical solutions provided in the present application will be further described with reference to the following specific embodiments and accompanying drawings. The advantages and features of the present application will become more apparent in conjunction with the following description.
It should be noted that the embodiments of the present application have a better implementation and are not intended to limit the present application in any way. The technical features or combinations of technical features described in the embodiments of the present application should not be considered as being isolated, and they may be combined with each other to achieve a better technical effect. The scope of the preferred embodiments of this application may also include additional implementations, and this should be understood by those skilled in the art to which the embodiments of this application pertain.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It is to be understood that the terms used herein are to be interpreted broadly and their specific meanings within the application can be specifically understood by those skilled in the art unless otherwise specifically defined or limited.
The drawings in the present application are in simplified form and are not to scale, but rather are provided for convenience and clarity in describing the embodiments of the present application and are not intended to limit the scope of the application. Any modification of the structure, change of the ratio or adjustment of the size of the structure should fall within the scope of the technical disclosure of the present application without affecting the effect and the purpose of the present application. And the same reference numerals appearing in the drawings of the present application denote the same features or components, which may be applied to different embodiments.
As shown in fig. 1 to 4, a passive wireless RFID crack sensor based on a short patch antenna includes a first component, a second component, and a third component; wherein, subassembly one includes radiation paster 1 down, base plate 2, goes up radiation paster 3, RFID chip 4, and subassembly two includes short circuit paster 5, removes base plate 6, and subassembly three includes connecting wire 7 and connecting plate 8.
The lower radiation patch 1 is tightly electroplated and attached to the lower surface of the substrate 2, and the lower radiation patch 1 completely covers the lower surface of the substrate 2; the upper radiation patch 3 is closely attached to the upper surface of the substrate 2 in an electroplating way; the RFID chip 4 is soldered to the upper surface of the substrate 2 and is connected to the upper radiation patch 3 by soldering.
Further, the short-circuit patch 5 is closely attached to the lower surface of the movable substrate 6 in an electroplating mode; the second assembly is arranged on the first assembly, so that the short-circuit patch 5 and the upper radiation patch 3 are close to each other, the upper part and the lower part of the short-circuit patch are overlapped and short-circuited, the width of the short-circuit patch 5 is equal to that of the upper radiation patch 3, but the short-circuit patch 5 and the upper radiation patch 3 are not in any rigid connection mode, and the upper radiation patch 3 and the short-circuit patch 5 can be in mutual dislocation; in this application, the short patch 5 overlaps the upper radiation patch 3 to constitute a large radiation patch.
Further, one side of the movable substrate 6, which is far away from the upper radiation patch 3, is connected with the connecting plate 8 through a connecting line 7, the movable substrate 6 is adhered to the connecting line 7, and the connecting line 7 is adhered to the connecting plate 8 through glue;
further, the first component is adhered to one side of the structure, and the second component is connected with the third component and is connected with the other side of the structure through a connecting plate 8. When the structure both sides produce relative displacement because of the crack, subassembly one just produces relative displacement with subassembly two for relative dislocation takes place between short circuit paster 5 and the last radiation paster 1, thereby leads to big radiation paster length change, thereby changes sensing system's resonant frequency.
In the application, the lower radiation patch 1, the upper radiation patch 3 and the short-circuit patch 5 are all made of copper; the substrate 2 and the movable substrate 6 both adopt RT5880 dielectric plates; the connecting wires 7 and the connecting plate 8 are made of a material with a dielectric constant close to 1, such as foam, so as to reduce the influence on the induced electromagnetic field of the antenna formed by the first component and the second component.
The application also provides a passive wireless crack sensing system based on the short-circuit patch antenna, which comprises a crack sensor 9, an RFID reader 11 and a data acquisition device 12; the crack sensor 9 is a passive wireless crack sensor based on a short-circuit patch antenna, and a first component in the crack sensor 9 is used as an RFID label; the RFID reader 11 is internally provided with a transmitting antenna 10, and the RFID reader 11 communicates with the RFID tag through the transmitting antenna 10; meanwhile, the data acquisition device 12 is also in communication connection with the RFID reader 11.
The application provides a passive wireless separated type crack strain sensing system based on Radio Frequency Identification (RFID) for breaking through the limitation of active and wired functions in the traditional crack sensor and the influence of the transmission efficiency of a substrate of a common antenna sensor, and can realize non-contact crack measurement without an external wired power supply.
Further, the RFID chip 4 carries the coded information of the tag, the RFID reader 11 is used for emitting modulated electromagnetic wave signals to the tag, the code of the tag can be identified, and when a plurality of RFID tags are arranged in the scanning range of the RFID reader, the reader can mark the crack width value of each measuring point according to the code of each tag.
In the crack measurement, the large radiation patch functions as a sensing unit. When a crack occurs in the structure, the first component (label) and the second component (label) which are adhered to two ends of the crack of the structure generate relative displacement with the third component, and relative dislocation occurs between the short-circuit patch 5 and the upper radiation patch 1, so that the length of the large radiation patch is increased, and the resonant frequency of the first component drifts; the RFID reader can detect the resonant frequency drift of the first component and send the resonant frequency drift to the data acquisition device 12; and the data acquisition device 12 calculates the crack width according to the resonant frequency shift of the first component.
The principle of calculating the crack width by the data acquisition device 12 according to the resonant frequency shift of the first component is as follows: because the shift of the resonant frequency has a linear relation with the length of the large radiation patch, the length change of the large radiation patch can be obtained through the shift calculation of the resonant frequency of the component I; the change in length of the large radiating patch is equal to the relative displacement produced by the first and second and third components, which is equal to the width of the crack produced, so that the crack width can be calculated by measuring the shift in resonant frequency.
Furthermore, the performance of the crack sensing system is related to the size of an antenna formed by the first component and the second component, the size of the upper radiation patch 3 and the width of the short-circuit patch 5 are optimized, and the sensitivity of the crack sensing system can be improved.
Further, the displacement principle of the measuring component of the present application is as follows: the RFID reader transmits modulated electromagnetic wave signals to the RFID label at different frequencies, and when the power of the signals received by the RFID label reaches a threshold value, a chip in the RFID label can be activated. Minimum transmission power P of reader required for activating labelmin(f) In relation to the frequency f of the signal transmitted by the reader, f is the frequency of the signal transmitted by the reader at the resonant frequency of the patch antenna in the RFID tagRMinimum transmit power P required to activate the tagmin(fR) And minimum. The resonant frequency of the antenna in the RFID tag can be determined by finding the transmission frequency at which the minimum transmission power reaches a minimum value. When the size of the large radiation patch changes, the resonance frequency of the large radiation patch shifts, and the shift amount of the resonance frequency can be determined by the method, so that the relative displacement value of the first component and the second component is obtained, and the opening width of the crack is obtained.
The above description is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the present application in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all the changes or modifications should fall within the protection scope of the technical solution of the present application.
Claims (2)
1. The utility model provides a passive wireless RFID crack sensor based on short circuit formula patch antenna which characterized in that: the device comprises a first component, a second component and a third component; the first assembly comprises a lower radiation patch (1), a substrate (2), an upper radiation patch (3) and an RFID chip (4), the second assembly comprises a short-circuit patch (5) and a movable substrate (6), and the third assembly comprises a connecting line (7) and a connecting plate (8);
the lower radiation patch (1) is tightly electroplated and attached to the lower surface of the substrate (2), and the lower radiation patch (1) completely covers the lower surface of the substrate (2); the upper radiation patch (3) is tightly electroplated and attached to the upper surface of the substrate (2); the RFID chip (4) is welded on the upper surface of the substrate (2) and is communicated with the upper radiation patch (3) through welding;
the short-circuit patch (5) is closely attached to the lower surface of the movable substrate (6) in an electroplating manner; the second assembly is arranged on the first assembly, so that the short-circuit patch (5) and the upper radiation patch (3) are close to each other, the upper part and the lower part of the short-circuit patch are overlapped and short-circuited, the width of the short-circuit patch (5) is equal to that of the upper radiation patch (3), but the short-circuit patch (5) and the upper radiation patch (3) are not in any rigid connection mode, and the upper radiation patch (3) and the short-circuit patch (5) can be in mutual dislocation; the overlapping part of the short-circuit patch (5) and the upper radiation patch (3) forms a large radiation patch;
one side of the movable substrate (6) far away from the upper radiation patch (3) is connected with the connecting plate (8) through the connecting line (7), the movable substrate (6) is pasted on the connecting line (7), and the connecting line (7) is pasted on the connecting plate (8) through glue.
2. The utility model provides a passive wireless crack sensing system based on short circuit formula patch antenna which characterized in that: comprises a crack sensor (9), an RFID reader (11) and a data acquisition device (12);
the crack sensor (9) comprises a first component, a second component and a third component; the first assembly comprises a lower radiation patch (1), a substrate (2), an upper radiation patch (3) and an RFID chip (4), the second assembly comprises a short-circuit patch (5) and a movable substrate (6), and the third assembly comprises a connecting line (7) and a connecting plate (8);
the lower radiation patch (1) is tightly electroplated and attached to the lower surface of the substrate (2), and the lower radiation patch (1) completely covers the lower surface of the substrate (2); the upper radiation patch (3) is tightly electroplated and attached to the upper surface of the substrate (2); the RFID chip (4) is welded on the upper surface of the substrate (2) and is communicated with the upper radiation patch (3) through welding;
the short-circuit patch (5) is closely attached to the lower surface of the movable substrate (6) in an electroplating manner; the second assembly is arranged on the first assembly, so that the short-circuit patch (5) and the upper radiation patch (3) are close to each other, the upper part and the lower part of the short-circuit patch are overlapped and short-circuited, the width of the short-circuit patch (5) is equal to that of the upper radiation patch (3), but the short-circuit patch (5) and the upper radiation patch (3) are not in any rigid connection mode, and the upper radiation patch (3) and the short-circuit patch (5) can be in mutual dislocation; the overlapping part of the short-circuit patch (5) and the upper radiation patch (3) forms a large radiation patch;
one side of the movable substrate (6) far away from the upper radiation patch (3) is connected with the connecting plate (8) through a connecting wire (7), the movable substrate (6) is adhered to the connecting wire (7), and the connecting wire (7) is adhered to the connecting plate (8) through glue;
a component I in the crack sensor (9) is used as an RFID label; the RFID reader (11) is internally provided with a transmitting antenna (10), and the RFID reader (11) is communicated with the RFID tag through the transmitting antenna (10); meanwhile, the data acquisition device (12) is also in communication connection with the RFID reader (11).
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| CN201910929879.0A CN110749272A (en) | 2019-09-29 | 2019-09-29 | Passive wireless crack sensor based on short-circuit patch antenna and sensing system |
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| CN201910929879.0A CN110749272A (en) | 2019-09-29 | 2019-09-29 | Passive wireless crack sensor based on short-circuit patch antenna and sensing system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110375686A (en) * | 2019-07-09 | 2019-10-25 | 武汉理工大学 | Wireless flexible micro-strip paster antenna sensor array for metal structure crackle and strain monitoring |
| CN111947563A (en) * | 2020-08-10 | 2020-11-17 | 南京智慧基础设施技术研究院有限公司 | Concrete dam joint division monitoring device and method based on radio frequency identification technology |
| CN112556564A (en) * | 2020-12-01 | 2021-03-26 | 同济大学 | Passive wireless deformation sensor and monitoring system based on double-layer patch antenna |
| CN113419079A (en) * | 2021-05-21 | 2021-09-21 | 同济大学 | Structural acceleration detection device based on short-circuit patch antenna |
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2019
- 2019-09-29 CN CN201910929879.0A patent/CN110749272A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110375686A (en) * | 2019-07-09 | 2019-10-25 | 武汉理工大学 | Wireless flexible micro-strip paster antenna sensor array for metal structure crackle and strain monitoring |
| CN111947563A (en) * | 2020-08-10 | 2020-11-17 | 南京智慧基础设施技术研究院有限公司 | Concrete dam joint division monitoring device and method based on radio frequency identification technology |
| CN112556564A (en) * | 2020-12-01 | 2021-03-26 | 同济大学 | Passive wireless deformation sensor and monitoring system based on double-layer patch antenna |
| CN113419079A (en) * | 2021-05-21 | 2021-09-21 | 同济大学 | Structural acceleration detection device based on short-circuit patch antenna |
| CN113419079B (en) * | 2021-05-21 | 2023-06-02 | 同济大学 | Structure acceleration detection device based on short-circuit patch antenna |
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