A loop antenna, electronic tag and detection system

Abstract

The application relates to a loop antenna, an electronic tag and a detection system, wherein at least one break is arranged on the loop antenna, the break makes the loop antenna lose information transmitting and receiving functions and forms a first end and a second end near the break of the loop antenna, the first end and the second end can make the loop antenna restore the information transmitting and receiving functions by being close to an external conductor or a radio frequency signal, so as to sense and measure physical quantities. By adding the break on the conductor of the loop antenna, the loop antenna can normally work when the loop antenna is close to an external conductor such as a human body, liquid or metal or a radio frequency signal at the break, the loop antenna has the functions of sensing various physical quantities, is passive, penetrative, high-precision, low-cost, ultrathin and flexible, can be placed inside a measured object, can complete the fields which cannot be measured by traditional measurement, can measure physical quantities such as temperature, liquid level and displacement, has good structural stability and strong practicability, and can be used for geological displacement measurement, crack measurement, industrial measurement, temperature measurement and the like.

Description

Technical Field

[0001] This invention relates to the field of electronic tags, and in particular to a loop antenna, an electronic tag, and a detection system. Background Technology

[0002] Electronic tags are also known as radio frequency tags, transponders, or data carriers; readers are also known as reading devices, scanners, read heads, communicators, or reader-writers (depending on whether the electronic tag can be wirelessly rewritten). Spatial (contactless) coupling of radio frequency signals is achieved between the electronic tag and the reader through coupling elements; within the coupling channel, energy transfer and data exchange are realized according to timing relationships.

[0003] Currently, the measurement of physical quantities such as temperature and liquid level is mostly carried out through corresponding sensors. These sensors are either active, too large, too expensive, or cannot be measured in real time. Moreover, there is still much room for improvement in terms of structural stability, product economy, and practicality. They cannot be used in some more complex environments and urgently need to be improved. Summary of the Invention

[0004] In view of this, the present invention provides an electronic tag structure that, by adding a break in the conductor of a loop antenna, allows the loop antenna to function normally when the break is near external conductors such as the human body, liquid, or metal, or when radio frequency signals are detected. This enables the loop antenna to sense various physical quantities and features passive, penetrating, high precision, low cost, ultra-thin, and flexible characteristics. It can be placed inside the object being measured and can perform measurements in areas where traditional methods are ineffective, such as measuring physical quantities like temperature, liquid level, and displacement. It not only has good structural stability but also strong practicality and can be used for geological displacement measurement, crack measurement, industrial measurement, temperature measurement, and inductive switches.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A loop antenna is provided, wherein the loop antenna has at least one break, the break causes the loop antenna to lose its information transmission and reception function, and a first end and a second end are formed near the break of the loop antenna. The first end and the second end can restore the information transmission and reception function of the loop antenna by being close to an external conductor or radio frequency signal, so as to sense and measure physical quantities.

[0007] An electronic tag structure includes the aforementioned loop antenna, and further includes an array antenna, an antenna connection portion, and a substrate. The array antenna and the loop antenna are connected through the antenna connection portion, and the loop antenna, the array antenna, and the antenna connection portion are all disposed on the substrate.

[0008] Furthermore, the ring antenna has a cross-section opening, and an RFID chip is installed at the cross-section opening.

[0009] A displacement electronic tag includes the above-described electronic tag structure, and further includes a traction member, an external conductor, a fixing member, a telescopic member, and a traction block. One end of the telescopic member is connected to the fixing member, and the other end is connected to the traction member through the external conductor. The other end of the traction member is connected to the object being measured. The external conductor can move under the drive of the traction member and contact the first end and the second end.

[0010] Furthermore, there are multiple electronic tag structures, which are arranged sequentially, and the breaks in the multiple electronic tag structures are located on the movement path of the external conductor.

[0011] A temperature electronic tag includes at least one of the above-described electronic tag structures, and also includes a container and a pipe, the container being in communication with the pipe, the pipe extending to a break in the electronic tag structure, and the container containing a conductive liquid capable of expanding with increasing temperature.

[0012] A temperature electronic tag includes at least one of the above-described electronic tag structures, and further includes a container, a pipe, an external conductor, and an elastic element. The pipe extends to a break in the electronic tag structure. The container is disposed at one end of the pipe, and the elastic element is disposed at the end of the pipe away from the container. The elastic element is connected to the external conductor, and the container contains a gas capable of expanding with increasing temperature.

[0013] A liquid level electronic tag includes multiple electronic tag structures as described above, as well as a pipe and an external conductor. The multiple electronic tag structures are arranged along the height direction of the liquid level. The pipe connects the breaks of the multiple electronic tag structures. The external conductor is disposed inside the pipe and can rise and fall with the liquid level.

[0014] Furthermore, the electronic tag structure senses the liquid level via RSSI.

[0015] A detection system includes the aforementioned electronic tag, and further includes a reader, a processor, and a terminal. The reader is used to read data from the electronic tag, and the processor is used to process the data and send the data to the terminal.

[0016] The advantages of this invention compared to the prior art are:

[0017] This invention features flexibility, thinness, passive operation, high measurement accuracy, and low cost. By adding a break in the loop antenna, the loop antenna can regain its information transmission and reception function when the break is near an external conductor such as a human body, liquid, or metal, or when radio frequency signals are detected. This enables the loop antenna to sense various physical quantities and adapt to different measurement needs. The signal sensitivity of the loop antenna changes depending on the size of the area where the break is near an external conductor, the distance between the break and the conductor, and the use of one or more loop antennas arranged in sequence. The loop antenna can regain its information transmission and reception function when the object being measured expands or the conductor is displaced to the break. This invention can measure physical quantities such as temperature, liquid level, and displacement, which are impossible to measure using traditional methods. It not only has good structural stability but also strong practicality and can be used in fields such as geological displacement measurement, crack measurement, industrial measurement, temperature measurement, and inductive switches. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the electronic tag structure according to the first embodiment of the present invention.

[0019] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0020] Figure 3 This is a structural diagram of the electronic tag structure according to the second embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the displacement electronic tag of the present invention.

[0022] Figure 5 This is a schematic diagram of another embodiment of the displacement electronic tag of the present invention.

[0023] Figure 6 This is a structural diagram of the first embodiment of the temperature electronic tag of the present invention.

[0024] Figure 7 This is a structural diagram of a second embodiment of the temperature electronic tag of the present invention.

[0025] Figure 8 This is a structural diagram of a third embodiment of the temperature electronic tag of the present invention.

[0026] Figure 9 This is a structural diagram of the fourth embodiment of the temperature electronic tag of the present invention.

[0027] Figure 10 This is a structural diagram of the electronic level tag of the present invention. Detailed Implementation

[0028] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0029] Please refer to Figure 1-2 The first embodiment of the present invention includes:

[0030] A loop antenna 100 is provided with at least one break 102, which causes the loop antenna 100 to lose its information transmission and reception function. A first end 103 and a second end 104 are formed near the break 102 of the loop antenna 100. The first end 103 and the second end 104 can restore the information transmission and reception function of the loop antenna 100 through an external conductor or a sufficiently strong radio frequency signal, so as to sense and measure physical quantities.

[0031] It should be noted that by setting the break point 102, the first end 103 and the second end 104 are not connected in the initial state. When the loop antenna is near an external conductor or when there is a radio frequency signal, the first end 103 and the second end 104 can be made to conduct to each other, thereby generating a signal and sensing and measuring physical quantities. It is understood that the external conductor can be any conductive conductor, such as the human body, liquid, metal, etc., and this application does not limit it.

[0032] It should be understood that a loop antenna is a radiating structure in which a metal conductor is wound into a certain shape (such as a circle, square, triangle, etc.), with the two ends of the conductor serving as the feed terminals. A loop antenna is one that is wound multiple times (such as in a spiral or overlapping manner).

[0033] Loop antennas can be classified according to their electrical dimensions. Those with a conductor length much shorter than the wavelength in free space are called electrically small loop antennas; when the conductor length of the loop approaches the resonant dimension (the loop circumference is close to the wavelength), they are called electrically large loop antennas, which are mainly used as elements in directional arrays and are resonant antennas.

[0034] The terminating load impedance of a loop antenna can be zero or equal to the characteristic impedance of the loop. The current distribution on it is similar to that of a parallel transmission line. The current in a small electrically connected loop is approximately distributed with equal amplitude and in phase. The current in a large electrically connected loop exhibits a standing wave distribution. When the impedance of the terminating load equals the characteristic impedance of the loop, the current in the loop exhibits a traveling wave distribution.

[0035] Based on the principle of the duality of electromagnetic radiation, the radiation fields of the small electric loop and the small electric dipole antenna placed perpendicular to the loop are similar except for the interchange of electric and magnetic quantities. That is, the radiation pattern is a circle on the plane of the loop, and the radiation pattern is a figure-eight on the plane where the loop axis is located. The radiation along the loop axis is zero.

[0036] The ring can be hollow or magnetically cored, with a single or multiple turns. Theory and experiments have shown that the radiation field is directly proportional to the area of ​​the ring, the number of turns, and the current in the ring, and inversely proportional to the square of the operating wavelength and the distance; it is not significantly related to the shape of the ring.

[0037] By connecting a load resistor at an appropriate location on the loop antenna, allowing a traveling wave current to flow through the conductor, a non-resonant loop antenna or a loaded loop antenna can be constructed, exhibiting a wide bandwidth. An electrically small loop antenna can be equivalently represented as a magnetic dipole composed of a pair of magnetic charges of equal value but opposite sign. Let the normal direction of the loop surface be taken as the polar axis of the spherical coordinate system, with the center of the loop placed at the origin. The small loop antenna exhibits consistent directivity when used as both a receiving and transmitting antenna. This is a natural consequence based on the reciprocity principle. Typically, the loop antenna can be directly used as the tuning inductor in the receiver input circuit, where the voltage at the receiver input is Q times the induced electromotive force of the loop antenna. Here, Q is the quality factor of the tuning circuit. In the past, small loop antennas were mainly used in lower frequency bands for broadcast reception or direction finding. Since the 1970s, they have been widely used in VHF and UHF frequencies, serving not only as receiving antennas but also as transmitting antennas.

[0038] This application also provides an electronic tag structure 200, including the aforementioned loop antenna 100, array antenna 201, antenna connection portion 202, and a substrate (not shown). The array antenna 201 and the loop antenna 100 are connected via the antenna connection portion 202. The loop antenna 100, array antenna 201, and antenna connection portion 202 are all disposed on the substrate. For example, the array antennas 201 are symmetrically arranged, and the antenna connection portion 202 is meandering, with one end connected to the array antenna 201 and the other end connected to the loop antenna 100. The loop antenna 100, array antenna 201, and antenna connection portion 202 are mounted on the substrate by means of adhesive bonding or welding.

[0039] In this embodiment, the loop antenna 100 is provided with a cross-section opening 105, and an RFID chip 106 is provided at the cross-section opening 105. It should be noted that when the cross-section of the loop antenna is close to a conductor, the radio frequency signal on the loop antenna 100 will generate a skin effect, and the electromagnetic signal will be connected from the first end 103 to the external conductor, and the external conductor will be connected to the second end 104, so that the loop antenna can restore the information transmission and reception function.

[0040] In addition, the high-frequency AC signal on the loop antenna 100 will produce a skin effect, which will enable the loop antenna to resume its information transmission and reception function when the radio frequency signal is strong enough.

[0041] Therefore, the high-frequency AC signal on the loop antenna 100 will produce a skin effect. When the loop antenna break 102 is close to external conductors such as human body, liquid, metal or radio frequency signal, the loop antenna can work normally. Through this characteristic, combined with water-absorbing materials or thermal expansion materials, it can be used to measure changes in physical quantities such as humidity and temperature.

[0042] Understandably, in some embodiments, the loop antenna 100 may not have a cross-section opening 105, that is, the loop antenna 100 may not have an RFID chip, and the loop antenna 100 can still sense and measure physical quantities through the cross-section.

[0043] The aforementioned loop antenna can be applied to UHF electronic tags. It should be noted that UHF (Ultra High Frequency) electronic tags are also called ultra-high frequency electronic tags. UHF tags are a type of RFID electronic tag. UHF electronic tags have the characteristics of long identification distance, high reading rate, strong anti-collision capability, and good scalability. The card reading distance is 3-10 meters, and 100 cards can be read per second.

[0044] Please refer to Figure 3 In the second embodiment of the electronic tag structure of the present invention, the first end 103 and the second end 104 are parallel to each other and have a preset length. The break 102 is located between the first end 103 and the second end 104, thereby forming a sensitivity sensing area. By sensing the contact length between the external conductor and the first end 103 and the second end 104, the sensitivity of the electronic tag can be changed. The change of physical quantity can be obtained by reading different sensitivities through an external device.

[0045] Please refer to Figure 4 , Figure 4 This is a structural diagram of a displacement electronic tag using the above-described electronic tag structure, wherein... Figure 4 Part a is a schematic diagram of the state before displacement. Figure 4 Part b is a schematic diagram of the state after displacement. Specifically, the displacement electronic tag in this embodiment mainly includes an electronic tag structure 200, a traction member 206, an external conductor 207, a fixing member 208, a telescopic member 210, and a traction block 209. One end of the telescopic member 210 is connected to the fixing member 208, and the other end is connected to the traction member 206 through the external conductor 207. The external conductor 207 is located on one side of the electronic tag structure 200 and is in contact with the electronic tag structure 200. One end of the traction member 206 is connected to the external conductor 207, and the other end is connected to the traction block 209.

[0046] The measurement principle of the above displacement electronic tag is as follows: the traction block 209 pulls the traction component 206, the traction component 206 drives the external conductor 207, the external conductor 207 contacts the first end 103 and the second end 104, making them connected, and the electronic tag structure 200 resumes the function of transmitting and receiving information. As the external conductor 207 moves, the external conductor 207 moves along the length direction of the sensitivity sensing area, so that the contact length with the first end 103 and the second end 104 changes, thereby changing the sensitivity of the electronic tag. The displacement can be obtained by reading the different sensitivities.

[0047] Please refer to Figure 5 , Figure 5 This is a structural diagram of a displacement electronic tag according to another embodiment, wherein... Figure 5 Part a is a schematic diagram of the state before displacement. Figure 5 Part b is a schematic diagram of the state after displacement. Specifically, the displacement electronic tag in this embodiment includes several of the above-mentioned electronic tag structures 200, as well as a traction member 206, an external conductor 207, a telescopic member 210, and a fixing member 208. The several electronic tag structures 200 are arranged in sequence. One end of the telescopic member 210 is connected to the fixing member 208, and the other end is connected to the traction member 206 through the external conductor 207. The other end of the traction member 206 is connected to the object being measured. The telescopic member 210 and the break 102 of the electronic tag structure 200 are positioned opposite each other.

[0048] When the object being measured is displaced, it drives the external conductor 207 and the telescopic component 210 through the traction component 206, so that the external conductor 207 comes into contact with the breaks 102 of the row of electronic tag structures 200 in sequence. The corresponding electronic tag structure 200 that the external conductor 207 contacts resumes its information transmission and reception function. By reading the position information of the electronic tag structure 200, the displacement of the object being measured can be obtained, thus realizing the measurement and sensing of the displacement of the object being measured.

[0049] Please refer to Figure 6 , Figure 6 This is a structural diagram of the first embodiment of the temperature electronic tag of this application, wherein... Figure 6 Part a is a schematic diagram of the initial temperature state. Figure 6 Part b is a schematic diagram of the state after the temperature rises. The temperature electronic tag in this embodiment includes the aforementioned electronic tag structure 200, and also includes a container 211 and a pipe 212. The pipe 212 is parallel to the length direction of the electronic tag structure 200. The container 211 is located at one end of the pipe 212, and the container 211 contains a conductive liquid that expands with increasing temperature. For example, the conductive liquid can be mercury. For ease of understanding, Figure 6 The shaded area represents the conductive liquid.

[0050] The measurement principle of the above-mentioned temperature electronic tag is as follows: the conductive liquid expands along the pipe 212 when heated, and approaches the first end 103 and the second end 104, making them connected. The electronic tag structure 200 resumes its information transmission and reception function. As the conductive liquid expands, it moves along the length of the sensitivity sensing area, and its contact length with the first end 103 and the second end 104 changes, thereby changing the sensitivity of the electronic tag. The corresponding temperature can be obtained by reading different sensitivities.

[0051] Please refer to Figure 7 , Figure 7 This is a structural diagram of a second embodiment of the temperature electronic tag of this application, wherein... Figure 7 Part a is a schematic diagram of the initial temperature state. Figure 7 Part b is a schematic diagram of the state after the temperature rises. The temperature electronic tag in this embodiment includes multiple electronic tag structures 200 as described above, as well as a container 211 and a pipe 212. The multiple electronic tag structures 200 are arranged sequentially. The pipe 212 extends along the arrangement direction of the electronic tag structures 200 and connects to the joints 102 of the multiple electronic tag structures 200. The container 211 is located at one end of the pipe 212, and the container 211 contains a conductive liquid that expands with increasing temperature. For example, the conductive liquid can be mercury. For ease of understanding... Figure 7 The shaded area represents the conductive liquid.

[0052] When the temperature rises, the conductive liquid expands along the pipe 212 and contacts the first end 103 and the second end 104 of the electronic tag structure 200, so that the breaks 102 of the multiple electronic tag structures 200 in a row are connected in sequence, thereby restoring the information transmission and reception function of the multiple electronic tag structures 200 in a row. By reading the number or location information of the electronic tag structures 200 with information transmission and reception function, the corresponding temperature can be obtained.

[0053] Please refer to Figure 8 , Figure 8 This is a structural diagram of the third embodiment of the temperature electronic tag of this application, wherein... Figure 8 Part a is a schematic diagram of the initial temperature state. Figure 8 Part b is a schematic diagram of the state after the temperature rises. The temperature electronic tag in this embodiment includes the aforementioned electronic tag structure 200, and also includes a container 211, a pipe 212, an external conductor 207, and an elastic element 213. The pipe 212 extends to the break in the electronic tag structure 200 and is parallel to the length direction of the sensitivity sensing area. The container 211 is located at one end of the pipe 212, and the elastic element 213 is located inside the pipe 212 at the end away from the container 211. The elastic element 213 is connected to the external conductor 207. The container 211 contains gas that can expand as the temperature rises. (For ease of understanding...) Figure 8 The shaded area represents gas.

[0054] The measurement principle of the above-mentioned temperature electronic tag is as follows: the gas expands along the pipe 212 when heated, thereby generating pressure on the external conductor 207. The elastic element 213 contracts under pressure, and the external conductor 207 moves along the pipe 212 under the pressure of the gas and comes into contact with the first end 103 and the second end 104, making them connected. The electronic tag structure 200 resumes its information transmission and reception function. As the gas expands, the external conductor 207 moves along the length of the sensitivity sensing area, and its contact length with the first end 103 and the second end 104 changes, thereby changing the sensitivity of the electronic tag. The corresponding temperature can be obtained by reading different sensitivities.

[0055] Please refer to Figure 9 , Figure 9 This is a structural diagram of the fourth embodiment of the temperature electronic tag of this application, wherein... Figure 9 Part a is a schematic diagram of the initial temperature state. Figure 9 Part b is a schematic diagram of the state after the temperature rises. The temperature electronic tag in this embodiment includes multiple electronic tag structures 200 as described above, and also includes a container 211, a pipe 212, an external conductor 207, and an elastic element 213. The multiple electronic tag structures 200 are arranged sequentially. The pipe 212 extends along the arrangement direction of the electronic tag structures 200 and connects to the breaks 102 of the multiple electronic tag structures 200. The container 211 is located at one end of the pipe 212, and the elastic element 213 is located inside the pipe 212 at the end away from the container 211. The elastic element 213 is connected to the external conductor 207. The container 211 contains gas that can expand as the temperature rises. (For ease of understanding...) Figure 9 The shaded area represents gas.

[0056] When the temperature rises, the gas expands along the pipe 212 due to heat, thereby generating pressure on the external conductor 207. The elastic element 213 contracts under pressure, and the external conductor 207 moves along the pipe 212 under the pressure of the gas, and comes into contact with the first end 103 and the second end 104 of the row of electronic tag structures 200 in sequence, so that the two are connected, thereby restoring the information transmission and reception function of the corresponding electronic tag structure 200. By reading the position information of the electronic tag structure 200 with information transmission and reception function, the corresponding temperature can be obtained.

[0057] Please refer to Figure 10 , Figure 10 This is a structural diagram of the fourth embodiment of the temperature electronic tag of this application. The liquid level electronic tag of this embodiment includes multiple electronic tag structures 200 as described above, and also includes a pipe 212 and an external conductor 207. The multiple electronic tag structures 200 are arranged along the height direction of the liquid level. The pipe 212 connects the breaks 102 of the multiple electronic tag structures 200. The external conductor 207 is disposed in the pipe 212 and can rise and fall with the liquid level.

[0058] By arranging multiple electronic tag structures 200 along the height direction of the liquid level, a scale is formed. When the liquid level reaches the corresponding height of the electronic tag structure 200, the electronic tag structure 200 resumes its information transmission and reception function. By reading the status of the electronic tag structure 200, the height of the liquid level can be determined, thus realizing the measurement of the liquid level.

[0059] In this embodiment, the liquid level electronic tag senses the liquid level via RSSI. It should be noted that RSSI (Received Signal Strength Indicator) indicates the intensity of the received signal. Different liquid levels result in different areas near the break in the conductor, thus producing different RSSI values. The electronic tag structure 200 can obtain the liquid level height value based on the RSSI, thereby achieving liquid level measurement.

[0060] This application also provides a detection system, including the aforementioned electronic tag 200, a reader, a processor, and a terminal. The reader is used to read data from the electronic tag, the processor is used to process the data, and the data is sent to the terminal. It should be noted that the reader can be any existing device, the processor can be a processing chip or a microcontroller, and the terminal can be a display device, a server, or a mobile terminal.

[0061] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0062] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electronic tag structure, characterized in that, The device includes a loop antenna, a multi-electrode antenna, an antenna connector, and a substrate. The loop antenna has at least one break, which disables the information transmission and reception function of the loop antenna. A first end and a second end are formed near the break. The first end and the second end can restore the information transmission and reception function of the loop antenna by approaching an external conductor or radio frequency signal to sense and measure physical quantities. The multi-electrode antenna and the loop antenna are connected through the antenna connector. The loop antenna, the multi-electrode antenna, and the antenna connector are all disposed on the substrate. The first end and the second end are parallel to each other and have a preset length. The break is located between the first end and the second end, thereby forming a sensitivity sensing area. By sensing the contact length between the external conductor and the first end and the second end, the sensitivity of the electronic tag can be changed. The change of physical quantity can be obtained by reading different sensitivities through an external device.

2. The electronic tag structure according to claim 1, characterized in that, The ring antenna has a cross-section opening, and an RFID chip is installed at the cross-section opening.

3. A displacement electronic tag, characterized in that, The electronic tag structure as described in claim 2 further includes a traction member, an external conductor, a fixing member, a telescopic member, and a traction block. One end of the telescopic member is connected to the fixing member, and the other end is connected to the traction member through the external conductor. The other end of the traction member is connected to the object being measured. The external conductor can move under the drive of the traction member and contact the first end and the second end.

4. The displacement electronic tag according to claim 3, characterized in that, The electronic tag structure comprises multiple structures, which are arranged sequentially, and the breaks in the multiple electronic tag structures are located on the movement path of the external conductor.

5. A temperature electronic tag, characterized in that, The device includes at least one electronic tag structure as described in claim 2, and further includes a container and a pipe, the container being in communication with the pipe, the pipe extending to a break in the electronic tag structure, and the container containing a conductive liquid capable of expanding with increasing temperature.

6. A temperature electronic tag, characterized in that, The device includes at least one electronic tag structure as described in claim 2, and further includes a container, a pipe, an external conductor, and an elastic element, wherein the pipe extends to a break in the electronic tag structure, the container is disposed at one end of the pipe, the elastic element is disposed inside the pipe at the end away from the container, the elastic element is connected to the external conductor, and the container contains a gas capable of expanding with increasing temperature.

7. A liquid level electronic tag, characterized in that, The device includes multiple electronic tag structures as described in claim 2, and also includes a pipe and an external conductor. The multiple electronic tag structures are arranged along the height direction of the liquid level. The pipe connects the breaks of the multiple electronic tag structures. The external conductor is disposed inside the pipe and can rise and fall with the liquid level.

8. The electronic level tag according to claim 7, characterized in that, The electronic tag structure senses the liquid level via RSSI.

9. A detection system, characterized in that, The electronic tag as described in any one of claims 3 to 8 further includes a reader, a processor, and a terminal, wherein the reader is used to read data from the electronic tag, the processor is used to process the data, and the processor is used to send the data to the terminal.

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