Sensing structure for improving dynamic response performance and differential resistance type sensor

Abstract

The utility model discloses a sensing structure for improving dynamic response performance and a differential resistance type sensor, and relates to the technical field of sensors. The support unit comprises a first support frame and a second support frame which are parallel to each other, two sides of the first support frame are respectively provided with n first binding posts and n second binding posts, two sides of the second support frame are respectively provided with n third binding posts and n fourth binding posts, and n is a natural number not less than 2; the differential unit comprises a first differential resistor and a second differential resistor which are opposite in change direction; the beneficial effects of the utility model are that a circular multi-groove ceramic assembly is eliminated, and a differential resistor is directly changed into a parallel stress section, so that local friction influencing stress transmission of a steel wire does not exist any more, transmission deformation lag caused by the local friction is effectively eliminated, and the dynamic response performance of the sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a sensing structure and a differential resistance sensor for improving dynamic response performance. Background Art

[0002] Differential resistance sensors have important applications in the field of dam safety monitoring. They have many advantages, such as high sensitivity, good long-term stability, strong regularity of observation results, and high cost-effectiveness. They are a type of important monitoring instrument that has been widely promoted and can be used to measure stress, strain, cracks and seepage pressure of concrete. The differential resistance sensor was successfully developed by Professor Carlson of the United States in 1932. It is also commonly known as the Carlson instrument. Its equivalent schematic diagram is shown below. Figure 1 R1 and R2 represent a pair of differentially sensitive steel wires within the sensor. This instrument utilizes two high-resistivity, high-tensile-strength steel wires as sensitive elements (R1 and R2). These are differentially tensioned within the instrument. The middle section of the sensitive wires is typically wrapped around a circular, multi-slot ceramic component. This converts the physical quantity sensed by the instrument into an analog value (resistance ratio Z = R1 / R2). This type of sensor is also known internationally as an elastic wire instrument.

[0003] Existing differential resistance sensors are static monitoring sensors suitable for monitoring slowly changing physical quantities. While the response speed of the sensitive steel wire within the sensor is sufficient for conventional static monitoring applications, when the externally applied physical quantity changes at a faster rate, the portion of the steel wire wound around and attached to the circular multi-slot ceramic component experiences significant additional lag in its stretching and shortening due to friction. Furthermore, the production process requires multiple turns of the steel wire between two sets of circular multi-slot ceramic components, and the wire tension must be maintained within a certain range. This requires high operator expertise and results in poor instrument parameter consistency.

[0004] In addition, the length of the existing differential resistance sensor wire rope is generally fixed and can only be extended or retracted within a certain range, and its ability to match different usage scenarios and instrument models is limited. Utility Model Content

[0005] In view of the problems existing in the prior art, the present utility model is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to avoid the response delay of the existing differential resistance sensor caused by the friction of the steel wire winding.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a sensing structure for improving dynamic response performance, comprising a support unit, including a first support frame and a second support frame parallel to each other, n first binding posts and n second binding posts are respectively provided on both sides of the first support frame, and n third binding posts and n fourth binding posts are respectively provided on both sides of the second support frame, where n is a natural number not less than 2; a differential unit, including a first differential resistor and a second differential resistor with opposite change directions, the first differential resistor is arranged on the first binding post and the third binding post, and the second differential resistor is arranged on the second binding post and the fourth binding post.

[0008] As a preferred solution of the sensing structure for improving dynamic response performance described in the present invention, the first terminal and the third terminal are located on the same side, and the second terminal and the fourth terminal are located on the other side.

[0009] As a preferred solution of the sensing structure for improving dynamic response performance described in the present invention, the first terminal and the second terminal are both insulated from the first support frame body; the third terminal and the fourth terminal are both insulated from the second support frame body.

[0010] As a preferred solution of the sensing structure for improving dynamic response performance described in the present invention, the adjacent intervals of the first terminals are equal to the adjacent intervals of the third terminals; the adjacent intervals of the second terminals are equal to the adjacent intervals of the fourth terminals.

[0011] As a preferred solution of the sensing structure for improving dynamic response performance described in the present invention, wherein: the first differential resistance zone is divided into n force-bearing segments and n-1 connecting segments connected in series, where n is a natural number not less than 2; the force-bearing segments are equal in length and parallel to each other, and the force-bearing segments and connecting segments are distributed in sequence; one end of the i-th force-bearing segment is connected to the i-th first terminal, and the other end of the i-th force-bearing segment is connected to the i-th third terminal; one end of the i-th connecting segment is connected to the i-th force-bearing segment through the i-th third terminal, and the other end of the i-th connecting segment is connected to the i+1 force-bearing segment through the i+1 first terminal; wherein, for the force-bearing segment, i = {1, 2, ..., n}, and for the connecting segment, i = {1, 2, ..., n-1}.

[0012] As a preferred solution of the sensing structure for improving dynamic response performance described in the present invention, the second differential resistance zone is divided into n force-bearing segments and n-1 connection segments connected in series, where n is a natural number not less than 2; one end of the j-th force-bearing segment is connected to the j-th second terminal, and the other end of the j-th force-bearing segment is connected to the j-th fourth terminal; one end of the j-th connection segment is connected to the j-th force-bearing segment through the j-th fourth terminal, and the other end of the j-th connection segment is connected to the j+1-th force-bearing segment through the j+1-th second terminal; wherein, for the force-bearing segment, j = {1, 2, ..., n}, and for the connection segment, j = {1, 2, ..., n-1}.

[0013] As a preferred solution of the sensing structure for improving dynamic response performance described in the present invention, the nth third binding post is connected to the first second binding post via an internal connecting line.

[0014] The beneficial effects of the sensing structure of the present invention for improving dynamic response performance are as follows: by eliminating the circular multi-slot ceramic component and directly changing the differential resistor into a parallel force-bearing segment, there is no longer any local friction that affects the force transmission of the steel wire, effectively eliminating the transmission deformation lag caused by local friction, and improving the dynamic response performance of the sensor.

[0015] Another problem to be solved by the present invention is how to ensure that the sensor matches different usage scenarios and instrument models.

[0016] To solve the above technical problems, the present invention also provides the following technical solutions: a differential resistance sensor, comprising the above-mentioned sensing structure for improving dynamic response performance; and a measuring unit, comprising a voltage measuring component, a signal line component and a reference resistor, wherein the voltage measuring component measures the voltages across the reference resistor, the first differential resistor and the second differential resistor respectively through the signal line component, and the reference resistor forms a series circuit with the first differential resistor and the second differential resistor.

[0017] As a preferred solution of the differential resistive sensor described in the present invention, wherein: the voltage measurement component includes a first voltage measurement channel, a second voltage measurement channel and a third voltage measurement channel; the signal line component includes a first signal line, a second signal line and a third signal line; the two ends of the first voltage measurement channel are connected to the first differential resistor through the first signal line and the third signal line respectively; the two ends of the second voltage measurement channel are connected to the second differential resistor through the second signal line and the third signal line respectively; the two ends of the third voltage measurement channel are connected to the two ends of the reference resistor.

[0018] As a preferred solution of the differential resistive sensor described in the present invention, wherein: the first signal line is connected to the first first terminal on the first support frame; the second signal line is connected to the nth fourth terminal on the second support frame; the third signal line is connected to the first second terminal on the first support frame.

[0019] The beneficial effect of the differential resistance sensor of the present invention is that by selecting different numbers of terminals, the number of force-bearing sections of the differential resistance is changed, thereby changing the size of the differential resistance, so as to achieve the purpose of matching the sensor with different usage scenarios and instrument models. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The diagram is a circuit measurement diagram of an existing differential resistance sensor.

[0022] Figure 2 Schematic diagram of the structure of an existing differential resistance sensor.

[0023] Figure 3 This is a schematic diagram of the support unit of the sensing structure for improving dynamic response performance described in the present invention.

[0024] Figure 4 This is a schematic diagram of one side of the sensing structure for improving dynamic response performance described in the present invention.

[0025] Figure 5 This is a schematic diagram of the other side of the sensing structure for improving dynamic response performance described in the present invention.

[0026] Figure 6 This is a circuit measurement schematic diagram of the differential resistance sensor described in the present utility model.

[0027] In the figure: support unit, 100; first support frame, 101; second support frame, 102; first terminal 101a; second terminal, 101b; third terminal, 102a; fourth terminal, 102b; differential unit, 200; internal connecting line, 201; first differential resistor, R1; second differential resistor, R2; measuring unit, 300; voltage measurement component, 301; signal line component, 302; reference resistor, Rs; first voltage measurement channel, 301a; second voltage measurement channel, 301b; third voltage measurement channel, 301c; first signal line, 302a; second signal line, 302b; third signal line, 302c. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0031] Example 1

[0032] Reference Figure 1-Figure 5 , is the first embodiment of the present utility model, which provides a sensing structure with improved dynamic response performance, including a support unit 100, including a first support frame 101 and a second support frame 102 parallel to each other, n first binding posts 101a and n second binding posts 101b are respectively provided on both sides of the first support frame 101, and n third binding posts 102a and n fourth binding posts 102b are respectively provided on both sides of the second support frame 102, where n is a natural number not less than 2; a differential unit 200, including a first differential resistor R1 and a second differential resistor R2 with opposite change directions, the first differential resistor R1 is provided on the first binding post 101a and the third binding post 102a, and the second differential resistor R2 is provided on the second binding post 101b and the fourth binding post 102b.

[0033] The first binding post 101 a and the third binding post 102 a are located on the same side, and the second binding post 101 b and the fourth binding post 102 b are located on the other side.

[0034] The first terminal 101a and the second terminal 101b are both insulated from the first support frame 101 body; the third terminal 102a and the fourth terminal 102b are both insulated from the second support frame 102 body.

[0035] The intervals between adjacent first binding posts 101 a are equal to the intervals between adjacent third binding posts 102 a ; the intervals between adjacent second binding posts 101 b are equal to the intervals between adjacent fourth binding posts 102 b .

[0036] The first differential resistor R1 is divided into n stressed segments and n-1 connecting segments connected in series, where n is a natural number not less than 2; the stressed segments are equal in length and parallel to each other, and the stressed segments and connecting segments are spaced apart in sequence.

[0037] The second differential resistor R2 is divided into n force-bearing segments and n-1 connection segments connected in series, where n is a natural number not less than 2.

[0038] The typical structure of the internal core components of the existing differential resistance sensor is as follows: Figure 2 As shown, the core components mainly include: two axially parallel support frames, two sets of circular multi-slot ceramic components, E / F forming one group and G / H forming another. The solid line represents the outer side of the support frame, while the dashed line represents the inner side. And a set (two) of sensitive steel wires made of the same material and with equal or similar resistance values. Each support frame is designed with two terminal blocks, which are insulated from the support frame. The two sets of circular multi-slot ceramic components are symmetrically fixed on either side of a support frame. Each side has a sensitive steel wire fixed to a square rod after appropriate pre-tensioning. That is, terminal blocks A / B correspond to the circular multi-slot ceramic components E / F as a group, and their corresponding sensitive steel wire is R1. Terminal blocks C / D correspond to the circular multi-slot ceramic components G / H as a group, and their corresponding sensitive steel wire is R2.

[0039] like Figure 2As shown in the figure, the middle axis direction of the two axially parallel support frames is the sensitive direction of the sensor. When the sensor senses an axial deformation (tension / compression) along its sensitive direction, the support frame will produce a follow-up displacement along the axial direction, causing the resistance of one resistor to increase (e.g., R1'=R1+δ) and the resistance of the other resistor to decrease (e.g., R2'=R2–δ); when the direction of the external deformation changes (opposite), the resistance change trend of the two differential resistors inside it also changes accordingly (e.g., R1'=R1–δ, R2'=R2+δ). The sensor's resistance ratio Z=R1 / R2 has a one-to-one functional relationship with the external deformation. By measuring the resistance values ​​of R1 and R2, the specific deformation (related stress and strain values, etc.) of the instrument can be obtained. Resistance and R T =R1+R2 is related to the sensor temperature and can be used to measure the ambient temperature where the sensor is located.

[0040] The middle axis direction of the first support frame 101 and the second support frame 102 of the present invention is the sensitive direction, which is the same as the sensitive direction design of the support frame in the prior art.

[0041] The difference is that the existing technology wraps the middle section of the sensitive steel wire around the ceramic component, which has the problem of delayed stress change caused by inherent friction. The utility model replaces the entire sensitive steel wire and ceramic component with a stress-bearing section, a connecting section and a terminal.

[0042] Specifically, each of the first support frame 101 and the second support frame 102 has one end connected to the axial end of the instrument housing. The axial direction of the instrument is the sensitive direction. When the axial direction of the instrument senses external tension or compression, it drives the first support frame 101 and the second support frame 102 to move relative to each other along the axial direction of the instrument, so that the stress change directions of the force-bearing sections on the first differential resistor R1 and the second differential resistor R2 are opposite.

[0043] The stress-bearing sections are in a stress-bearing state and are arranged to be parallel to each other, which can ensure that after the first support frame 101 and the second support frame 102 are subjected to sensitive reverse tensile (compressive) forces, they are evenly transmitted to the stress-bearing sections.

[0044] The connecting section is not subjected to stress and only serves to transmit current. The stress-bearing section and the connecting section are spaced apart to ensure that the stress direction of each stress-bearing section is consistent.

[0045] Because the connection between adjacent stress-bearing sections and connecting sections is achieved through terminal blocks, the inherent friction caused by the winding of multiple sets of steel wires is avoided, and the stress state will not produce delays, so it can accurately and sensitively reflect the stress changes in the sensitive direction, achieving the purpose of accurate measurement.

[0046] Example 2

[0047] Reference Figure 4 and Figure 5 , which is the second embodiment of the present utility model, and is different from the first embodiment in that: this embodiment discloses the specific composition of the force-bearing section and the connecting section, that is, the first differential resistor R1 is divided into n force-bearing sections and n-1 connecting sections connected in series, where n is a natural number not less than 2; the force-bearing sections are equal in length and parallel to each other, and the force-bearing sections and the connecting sections are spaced apart in sequence; one end of the i-th force-bearing section is connected to the i-th first terminal 101a, and the other end of the i-th force-bearing section is connected to the i-th third terminal 102a; one end of the i-th connecting section is connected to the i-th force-bearing section through the i-th third terminal 102a, and the other end of the i-th connecting section is connected to the i+1-th force-bearing section through the i+1-th first terminal 101a; wherein, for the force-bearing section, i={1, 2, …, n}, and for the connecting section, i={1, 2, …, n-1}.

[0048] The second differential resistor R2 is divided into n stressed segments and n-1 connecting segments connected in series, where n is a natural number not less than 2; one end of the j-th stressed segment is connected to the j-th second terminal 101b, and the other end of the j-th stressed segment is connected to the j-th fourth terminal 102b; one end of the j-th connecting segment is connected to the j-th stressed segment through the j-th fourth terminal 102b, and the other end of the j-th connecting segment is connected to the j+1-th stressed segment through the j+1-th second terminal 101b; wherein, for the stressed segments, j = {1, 2, ..., n}, and for the connecting segments, j = {1, 2, ..., n-1}.

[0049] The nth third binding post 102 a is connected to the first second binding post 101 b via an internal connecting line 201 .

[0050] It is worth noting that, for both the first differential resistor R1 and the second differential resistor R2, the number of connecting segments is one less than the number of stress-bearing segments.

[0051] For the first differential resistor R1, this is because after the last, i.e., nth, force-bearing segment is connected to the last third terminal 102a, it needs to be connected to the first second terminal 101b on the second differential resistor R2 through the internal connecting line 201, so the nth connecting segment is no longer needed, or in other words, the internal connecting line 201 is theoretically the nth connecting segment.

[0052] For the second differential resistor R2, this is because after the last, i.e., nth, force-bearing section is connected to the last fourth terminal 102b, it will be directly connected to the external second signal line 302b, so the nth connecting section is no longer needed.

[0053] In summary, the n force-bearing segments and n connection segments connected in series can be regarded as an overall first differential resistor R1, and the n force-bearing segments and n connection segments connected in series can be regarded as an overall second differential resistor R2, and the internal connecting line 201 makes the first differential resistor R1 and the second differential resistor R2 form an overall series structure.

[0054] Example 3

[0055] Reference Figures 1-6 , which is the third embodiment of the present utility model, is different from the previous two embodiments in that this embodiment provides a differential resistance sensor: including the above-mentioned sensing structure for improving dynamic response performance; and also including a measuring unit 300, including a voltage measuring component 301, a signal line component 302 and a reference resistor Rs. The voltage measuring component 301 measures the voltages across the reference resistor Rs, the first differential resistor R1 and the second differential resistor R2 respectively through the signal line component 302. The reference resistor Rs forms a series circuit with the first differential resistor R1 and the second differential resistor R2.

[0056] The voltage measurement component 301 includes a first voltage measurement channel 301a, a second voltage measurement channel 301b, and a third voltage measurement channel 301c; the signal line component 302 includes a first signal line 302a, a second signal line 302b, and a third signal line 302c; the two ends of the first voltage measurement channel 301a are connected to the first differential resistor R1 via the first signal line 302a and the third signal line 302c, respectively; the two ends of the second voltage measurement channel 301b are connected to the second differential resistor R2 via the second signal line 302b and the third signal line 302c, respectively; and the two ends of the third voltage measurement channel 301c are connected to the two ends of the reference resistor Rs.

[0057] The first signal line 302a is connected to the first first terminal 101a on the first support frame 101; the second signal line 302b is connected to the nth fourth terminal 102b on the second support frame 102; and the third signal line 302c is connected to the first second terminal 101b on the first support frame 101.

[0058] Based on the existing sensor structure, the two original sets of circular multi-slot ceramic components are removed. Several sets of weld points are added in the middle of the supporting square rods to maintain insulation between them. Using these additional weld points, several sensitive steel wires of equal (or similar) length and differential position are arranged between the two supporting square rods. These sensitive steel wires, each bearing the same force direction, are then connected in series, achieving the same goal of extending the total length of the sensitive steel wires as in the original structure. The shorting wires connecting the internal sensitive steel wires in the series are in a stress-free state within the sensor's range. Copper wire is used for the shorting wires, and its resistance is negligible compared to the resistance of the sensitive steel wires.

[0059] When the sensor senses external deformation along its axial direction, its internal supporting square rod will produce a follow-up displacement along the axial direction, thereby directly driving one group of internal steel wires (composed of multiple sections of steel wires with the same force direction connected in series through the internal connecting line 201) to synchronously extend (R1'=R1+δ1) and another group (also composed of multiple sections of steel wires with the same force direction connected in series through the internal connecting line 201) to synchronously shorten (R2'=R2-δ2). When R1≈R2, δ1≈δ2.

[0060] The measurement of differential resistance sensors is generally carried out using a constant current source excitation method. The first differential resistor R1 and the second differential resistor R2 represent a group of two steel wires with equal (or similar) resistance values ​​and differentially changing structures inside the sensor. Rs represents a high-precision reference resistor inside the measuring instrument (device). During measurement, the measuring instrument (device) connects its internal reference resistor Rs with the two differential resistors R1 and R2 inside the sensor to form a series circuit. The excitation current passes through Rs, R1, and R2 in sequence. The voltage drops Vs, V1, and V2 formed after the excitation current flows through Rs, R1, and R2 are known values. According to Ohm's law, I = Vs / Rs = V1 / R1 = V2 / R2. After the circuit measures Vs, V1, and V2, the actual resistance values ​​of R1 and R2 can be calculated, and thus their resistance ratio Z = R1 / R2, as well as the resistance and R can be calculated. T =R1+R2, further, according to the resistance ratio Z, resistance and R T The functional relationship between the sensor and the external measured physical quantity can ultimately determine the size of the corresponding physical quantity.

[0061] Because multiple groups of terminals can be provided on the first support frame 101 and the second support frame 102 in this solution, the corresponding sensitive wires can be freely increased or decreased to adapt to measurements of different ranges or different scenarios.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A sensing structure for improving dynamic response performance, characterized by: include, A support unit (100) comprises a first support frame (101) and a second support frame (102) which are parallel to each other, wherein n first binding posts (101a) and n second binding posts (101b) are respectively provided on both sides of the first support frame (101), and n third binding posts (102a) and n fourth binding posts (102b) are respectively provided on both sides of the second support frame (102), wherein n is a natural number not less than 2; The differential unit (200) comprises a first differential resistor (R1) and a second differential resistor (R2) with opposite change directions, wherein the first differential resistor (R1) is arranged on a first terminal (101a) and a third terminal (102a), and the second differential resistor (R2) is arranged on a second terminal (101b) and a fourth terminal (102b).

2. The sensing structure for improving dynamic response performance according to claim 1, wherein: The first terminal (101a) and the third terminal (102a) are located on the same side, and the second terminal (101b) and the fourth terminal (102b) are located on the other side.

3. The sensing structure for improving dynamic response performance according to claim 2, wherein: The first terminal (101a) and the second terminal (101b) are both insulated from the first support frame (101) body; The third terminal (102a) and the fourth terminal (102b) are both insulated from the second support frame (102) body.

4. The sensing structure for improving dynamic response performance according to claim 3, wherein: The intervals between adjacent first binding posts (101a) and the intervals between adjacent third binding posts (102a) are equal; The intervals between adjacent second binding posts (101b) are equal to the intervals between adjacent fourth binding posts (102b).

5. The sensing structure for improving dynamic response performance according to claim 4, wherein: The first differential resistor (R1) is divided into n force-bearing segments and n-1 connection segments connected in series, wherein n is a natural number not less than 2; The load-bearing sections are of equal length and parallel to each other, and the load-bearing sections and the connecting sections are spaced apart in sequence; One end of the i-th force-bearing section is connected to the i-th first terminal (101a), and the other end of the i-th force-bearing section is connected to the i-th third terminal (102a); One end of the i-th connecting segment is connected to the i-th load-bearing segment via the i-th third connecting post (102a), and the other end of the i-th connecting segment is connected to the i+1-th load-bearing segment via the i+1-th first connecting post (101a); Among them, for the load-bearing segment, i = {1, 2, ..., n}, for the connecting segment, i = {1, 2, ..., n-1}.

6. The sensing structure for improving dynamic response performance according to claim 5, wherein: The second differential resistor (R2) is divided into n force-bearing segments and n-1 connection segments connected in series, wherein n is a natural number not less than 2; One end of the j-th force-bearing section is connected to the j-th second terminal (101b), and the other end of the j-th force-bearing section is connected to the j-th fourth terminal (102b); One end of the jth connection segment is connected to the jth load-bearing segment via the jth fourth terminal (102b), and the other end of the jth connection segment is connected to the j+1th load-bearing segment via the j+1th second terminal (101b); Among them, for the load-bearing segment, j = {1, 2, ..., n}, and for the connecting segment, j = {1, 2, ..., n-1}.

7. The sensing structure for improving dynamic response performance according to claim 6, wherein: The nth third binding post (102a) and the first second binding post (101b) are connected via an internal connecting line (201).

8. A differential resistance sensor, characterized in that: comprising a sensing structure for improving dynamic response performance as described in any one of claims 1 to 7; and include, A measuring unit (300) comprises a voltage measuring component (301), a signal line component (302) and a reference resistor (Rs); the voltage measuring component (301) measures the voltages across the reference resistor (Rs), a first differential resistor (R1) and a second differential resistor (R2) respectively through the signal line component (302); the reference resistor (Rs) forms a series loop with the first differential resistor (R1) and the second differential resistor (R2).

9. The differential resistance sensor according to claim 8, wherein: The voltage measurement component (301) comprises a first voltage measurement channel (301a), a second voltage measurement channel (301b) and a third voltage measurement channel (301c); The signal line assembly (302) includes a first signal line (302a), a second signal line (302b) and a third signal line (302c); Two ends of the first voltage measurement channel (301a) are respectively connected to the first differential resistor (R1) via a first signal line (302a) and a third signal line (302c); Two ends of the second voltage measurement channel (301b) are respectively connected to the second differential resistor (R2) via a second signal line (302b) and a third signal line (302c); Two ends of the third voltage measurement channel (301c) are connected to two ends of a reference resistor (Rs).

10. The differential resistance sensor according to claim 9, wherein: The first signal line (302a) is connected to the first first terminal (101a) on the first support frame (101); The second signal line (302b) is connected to the nth fourth terminal (102b) on the second support frame (102); The third signal line (302c) is connected to the first second terminal (101b) on the first support frame (101).

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