A sensor response performance test system and method

Abstract

The application discloses a kind of sensor response performance test system and method, the system includes cantilever beam, the force platform that is horizontally hung in the cantilever beam below by suspension spring group, spherical impact vibrator is arranged in the force platform directly below and the impact component that drives spherical impact vibrator upward movement to exert vertical impact load to force platform, the upper end surface of force platform is equipped with several with the ring array distribution of the point to be impacted of spherical impact vibrator as center sensor, one is reference sensor, the rest is to be measured sensor, sensor output signal is connected to multichannel time domain vibration signal acquisition instrument, the trigger switch of acquisition instrument start is located on the stroke of impact vibrator hitting force platform, impact vibrator excites force platform to generate vibration wave, and the amplitude spectrum of time domain signal is measured by each to be measured sensor and reference sensor signal, and the admittance spectrum is calculated by dividing, and the dynamic response performance of each to be measured sensor is obtained from the data characteristics of admittance spectrum.

Description

Technical Field

[0001] This invention belongs to the field of sensor performance testing technology, and in particular relates to a transient sensor dynamic response performance testing system and method. Background Technology

[0002] Measuring sensor response performance is a necessary step in revealing sensor performance indicators. Comparisons between sensors based on different principles or before and after sensor improvements require rapid understanding. Traditional testing methods, such as those described in patent 2015104554699, involve placing the sensor on a vibration table, sequentially exciting it with varying frequencies in the frequency domain, and testing the sensor's response amplitude to obtain its vibration response spectrum. This method requires a vibration table, and because it involves scanning frequency signals sequentially, the measurement cycle is long. Generally, vibration tables are not suitable for testing high-frequency vibration response characteristics above kilohertz, making it difficult to obtain high-frequency response performance data for sensors. Summary of the Invention

[0003] The main objective of this invention is to provide a sensor response performance testing system and method. This method excites vibration through a high-speed transient impact source, obtains the time-domain vibration curve of the sensor's excited response using a multi-channel vibration acquisition instrument, and then obtains the sensor's vibration response spectrum in one go through numerical spectrum analysis. Compared with the traditional frequency sweep excitation method, the testing efficiency is greatly improved, and the continuous dynamic response characteristics in the frequency domain can be obtained.

[0004] To this end, the present invention provides a sensor response performance testing system, comprising a cantilever beam, a force-bearing platform horizontally suspended below the cantilever beam by a suspension spring assembly, a spherical impact oscillator disposed directly below the force-bearing platform, and an impact assembly that drives the spherical impact oscillator to move upward to apply a vertical impact load to the force-bearing platform. The impact assembly includes a base, an oscillator spring mounted on the base, and a cable that drives the oscillator spring to compress. The bottom end of the spherical impact oscillator is fixedly connected to the top end of the oscillator spring.

[0005] Several sensors are provided on the upper surface of the force-bearing platform. The force-bearing platform is also provided with a multi-channel vibration acquisition instrument for acquiring the time-domain vibration signals of the sensors and a normally open inductive switch for controlling the operation of the multi-channel vibration acquisition instrument. The normally open inductive switch can be triggered when the spherical impact oscillator moves toward the force-bearing platform. The several sensors are arranged in a ring array with the impact point of the spherical impact oscillator as the center. One of the sensors is a reference sensor and the rest are sensors to be measured.

[0006] Specifically, the suspension spring assembly includes at least three suspension springs, the force-bearing platform is circular in shape, and the at least three suspension springs are arranged in a circular array on the force-bearing platform with the center point of the force-bearing platform as the center.

[0007] Specifically, the impact direction of the spherical impact oscillator is precisely aligned with the center of the force-bearing platform.

[0008] Specifically, the base is also equipped with a scale for measuring the compression of the oscillator spring.

[0009] Specifically, an adjusting screw is vertically provided on the base, and the adjusting screw is threadedly connected to a threaded through hole on the base. The vibrator spring is fixedly installed on the top of the adjusting screw.

[0010] Specifically, the cable passes through the inner cavity of the vibrator spring and the wire hole of the adjusting screw in sequence before connecting to the pull ring.

[0011] Specifically, the spherical impact oscillator is made of aluminum alloy.

[0012] Specifically, the inductive switch is a photoelectric switch.

[0013] The sensor response performance testing method provided by another aspect of the present invention involves compressing the oscillator spring to a predetermined length using a cable, and then releasing the cable. The impact oscillator moves upward under the elastic force provided by the oscillator spring and triggers a normally open inductive switch, enabling the multi-channel vibration acquisition instrument to work normally. As the impact oscillator continues to move upward, it stimulates the impact force table to vibrate. The multi-channel vibration acquisition instrument collects the time-domain vibration signals of all sensors, calculates and obtains the admittance spectrum of all the sensors under test relative to the reference sensor (10) one by one.

[0014]

[0015] Where B(f) is the spectrum of the time-domain vibration signal of the sensor under test, C(f) is the spectrum of the time-domain vibration signal of the reference sensor, E(f) is the admittance spectrum, and |.| is the modulus or absolute value calculation symbol.

[0016] The dynamic response performance of each sensor under test in each frequency band is obtained from the admittance spectrum data characteristics; where:

[0017] If the admittance spectrum is a horizontal straight line with an approximate value of 1 in the corresponding frequency band, the dynamic response performance of the sensor under test is considered to be normal across the entire frequency band. If the admittance spectrum in the corresponding frequency band is less than 1, the response performance is considered to be defective and the sensor performance is reduced. If the admittance spectrum value in the corresponding frequency band is greater than 1, the response performance is considered to be improved compared to the reference sensor.

[0018] Compared with existing technologies, the present invention has the following advantages: By using a spring-loaded oscillator and vertical upward excitation, the center of gravity of the oscillator is vertically downward, minimizing the impact contact time between the oscillator and the object being impacted. The spherical design of the oscillator ensures near-point contact with the object being impacted, allowing for a very wide frequency band to be obtained with a single impact. Under conditions close to the excitation point of the vibration source, the sensor outputs a time-domain vibration signal to a multi-channel vibration acquisition instrument to form a numerical signal. Fourier transforms are performed on the time-domain numerical signals to obtain the spectrum. The admittance spectrum is obtained by dividing the spectrum of the signal recorded by the sensor under test by the spectrum of the signal recorded by the reference sensor. Based on this admittance spectrum characteristic, the dynamic response characteristics of the sensor under test are reflected. Compared with the traditional frequency sweep excitation method, the vibration response spectrum of the sensor can be obtained in one go through numerical spectrum analysis, significantly improving the testing efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the sensor response performance testing system provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the sensor distribution on the force-bearing platform provided in an embodiment of the present invention;

[0022] Figure 3 This is a graph of the time-domain acquired numerical signals of impact vibration obtained by the sensor under test and the reference sensor in this invention;

[0023] Figure 4 yes Figure 3 The amplitude spectrum obtained by Fourier transforming a mid-time domain signal;

[0024] Figure 5 It is by Figure 4 The admittance spectrum of the sensor under test obtained by amplitude spectrum calculation;

[0025] The components include: 1. Cantilever beam; 2. Suspension spring assembly; 3. Force-bearing platform; 4. Spherical impact oscillator; 5. Base; 6. Oscillator spring; 7. Cable; 8. Vibration acquisition instrument; 9. Normally open inductive switch; 10. Reference sensor; 11. Sensor under test; 12. Scale; 13. Adjusting screw; 14. Wire hole; 15. Pull ring. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 limitations on this invention.

[0028] Furthermore, the terms "first" and "second" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] An ideal time-domain pulse source can excite a uniform and broad spectrum, meaning the amplitude spectrum of an ideal pulse source impact is a spectrum of equal amplitudes at different frequencies. If an ideal pulse source is used to excite a sensor to produce a response, or if the sensor records the ideal pulse excitation response, the sensor's vibration response spectrum can be obtained in one go through numerical spectrum analysis. This time-saving and labor-saving testing method, based on the principle of time-frequency domain interchange, has great practical value. However, real-world impacts cannot form a uniform and broad spectrum like an ideal pulse. But if the impact force has an extremely short duration and makes near-point contact with the impacted object, an extremely wide frequency band can still be obtained. This application proposes an innovative solution based on the above principle.

[0030] See Figure 1 and Figure 2A sensor response performance testing system includes a cantilever beam 1, a force-bearing platform 3 horizontally suspended below the cantilever beam 1 by a suspension spring assembly 2, a spherical impact oscillator 4 positioned directly below the force-bearing platform 3, and an impact assembly that drives the spherical impact oscillator 4 to move upward to apply a vertical impact load to the force-bearing platform 3. The impact assembly includes a base 5, an oscillator spring 6 mounted on the base 5, and a cable 7 that compresses the oscillator spring 6. The bottom end of the spherical impact oscillator 4 is fixedly connected to the top end of the oscillator spring 6. N+1 sensors are provided on the upper surface of the force-bearing platform 3. The force-bearing platform 3 is also provided with an N+1-channel vibration acquisition instrument 8 for acquiring the time-domain vibration signals of each sensor, and a normally open inductive switch 9 for controlling the operation of the vibration acquisition instrument 8. The normally open inductive switch 9 can be triggered when the spherical impact oscillator 4 moves toward the force-bearing platform 3. The N+1 sensors are arranged in a ring array with the impact point of the spherical impact oscillator 4 as the center. One of the N+1 sensors is a reference sensor 10, and the rest are sensors 11 to be tested.

[0031] The working process of the above sensor response performance testing system is as follows: the oscillator spring 6 is compressed to a predetermined length by the cable 7, and then the cable 7 is released. The impact oscillator moves upward under the elastic force provided by the oscillator spring 6 and triggers the induction switch. The induction switch changes from the open state to the closed state, so that the working circuit of the multi-channel vibration acquisition instrument 8 is turned on. The multi-channel vibration acquisition instrument 8 can work normally to collect data. As the impact oscillator moves upward, the impact oscillator impacts the force table 3 and generates vibration. Under the vibration excitation, each sensor outputs a time-domain vibration signal to the N+1 channel vibration acquisition instrument 8 to form a multi-channel time-domain numerical signal. Fourier transform is performed on each channel time-domain numerical signal to obtain the spectrum. The spectrum of the signal recorded by the sensor under test is divided by the spectrum of the signal recorded by the reference sensor 10 to obtain the admittance spectrum. The dynamic response characteristics of the sensor under test are reflected by the admittance spectrum.

[0032] This embodiment utilizes a spring-loaded oscillator and vertically upward excitation, with the oscillator's center of gravity pointing vertically downwards. This minimizes the impact contact time between the oscillator and the object being impacted, creating a transient impact. The spherical design of the oscillator ensures near-point contact with the object, allowing for a single impact to achieve an extremely wide frequency band (reaching kilohertz levels or higher). Under conditions close to the excitation point, the time-domain vibration response curve of the tested sensor is recorded by the instrument. Fourier transform yields the vibration response spectrum within a certain bandwidth, and numerical spectrum analysis provides a single-step analysis of the sensor's vibration response spectrum. Compared to traditional frequency sweep excitation methods, this significantly shortens the testing cycle. Furthermore, by distributing multiple sensors in a circular array around the impact point, consistent vibration excitation across all sensors is ensured, allowing for the testing of the dynamic response characteristics of multiple sensors in a single test, further improving testing efficiency.

[0033] See Figure 1 Specifically, the suspension spring assembly 2 includes three suspension springs. The two ends of each spring are fixedly connected to the cantilever beam 1 and the force-bearing platform 3, respectively. The force-bearing platform 3 is circular in shape. The three suspension springs are arranged in a circular array on the force-bearing platform 3, with the center point as the center. The impact direction of the spherical impact oscillator 4 is precisely aligned with the center of the force-bearing platform 3. This design ensures the stability of the force-bearing platform 3. Of course, the number of suspension springs can also be four or even more, which will not be elaborated upon here.

[0034] Specifically, the base 5 is also equipped with a scale 12 for measuring the compression of the oscillator spring 6. The compression length of the oscillator spring 6 can be calibrated by the scale 12. The main frequency and pulse width of the impact excitation can be adjusted by adjusting the elastic coefficient of the suspension spring, the radius, thickness and density of the force platform 3. The oscillator is made of rigid material, which has high stiffness and light weight. Materials such as aluminum alloy and titanium steel can be used.

[0035] Specifically, an adjusting screw 13 is vertically provided on the base 5. The adjusting screw 13 is threadedly connected to the threaded through hole on the base 5. The vibrator spring 6 is fixedly installed on the top of the adjusting screw 13. By turning the adjusting screw 13, the distance between the impact vibrator and the force-bearing platform 3 can be adjusted, thereby flexibly adjusting the impact force. The adjusting screw 13 is provided with a wire hole 14. The cable 7 passes through the inner cavity of the vibrator spring 6 and the wire hole 14 in sequence and is connected to the pull ring 15.

[0036] Specifically, the inductive switch is a photoelectric switch. The photoelectric switch detects the state of the impact oscillator and outputs a level signal. The output level signal enters the vibration acquisition instrument 8 as a digital signal acquisition trigger signal.

[0037] During testing, a normal sensor with the same nominal specifications as the sensor under test is selected as the reference sensor 10. The sensor under test and the reference sensor 10 are mounted in a circular array on the force table 3. The oscillator spring 6 is compressed to a predetermined length by the cable 7, and the pull ring 15 is released. The impact oscillator impacts the force table 3 to generate vibration. Each sensor outputs a time-domain vibration signal to the vibration acquisition instrument 8 to form a multi-channel numerical signal. Fourier transform is performed on the multi-channel time-domain numerical signal to obtain the spectrum. The admittance spectrum is obtained by dividing the spectrum of the signal recorded by the sensor under test by the spectrum of the signal recorded by the reference sensor 10. The dynamic response characteristics of the sensor under test are reflected by this admittance spectrum.

[0038] Based on the admittance spectrum characteristic reflecting the frequency response features of the sensor, its calculation expression is as follows:

[0039]

[0040] Where B(f) is the spectrum of the time-domain vibration signal of the sensor under test, C(f) is the spectrum of the reference sensor, E(f) is the admittance spectrum, and |.| is the modulus or absolute value calculation symbol.

[0041] According to the expression, if the dynamic response performance of the sensor under test is normal across the entire frequency band, the admittance spectrum in that frequency band is a horizontal straight line with an approximate value of 1. If the response performance is defective, i.e., the performance is reduced, the admittance spectrum in that frequency band is less than 1. If the response performance is improved compared to the reference sensor, the admittance spectrum value in that frequency band is greater than 1. The relative magnitude of being greater than 1 or less than 1 reflects the level of reduction or improvement in sensor performance.

[0042] refer to Figure 2 To compare the dynamic response performance of multiple different sensors, multiple sensors and a reference sensor are placed on the mounting base of the force table at one time. A multi-channel vibration acquisition instrument collects the time-domain vibration signals of all sensors, calculates and obtains the admittance spectrum of each sensor under test relative to the reference sensor, and compares the dynamic response performance and consistency of the sensors under test based on the values ​​of the admittance spectra.

[0043] By obtaining the time-domain signal differences of different sensors, the arrival time and amplitude of the first wave, follow-up wave and tail wave can be directly determined, and the response performance of the sensors and the consistency between multiple sensors can be preliminarily determined, providing a reference for the selection of operational sensors. If there are new process designs and optimized sensors, dynamic test experiments can also be carried out on this stress table to provide a reference for confirming the performance improvement effect of the new scheme.

[0044] Specific Cases

[0045] The system adopts a split structure, with the base 5 and cantilever beam 1 separate. This minimizes the impact of the oscillator spring 6 on the vibration of the base 5, which in turn affects the vibration of the force platform 3. Three springs of the same specification with a spring constant of 200g / cm suspend the 500g PVC circular plate-shaped force platform 3 below the cantilever beam 1. A sensor fixing device is installed at the center of the top of the force platform 3. A 100g aluminum alloy oscillator ball is fixed to the top of the oscillator spring 6 with a spring constant of 100g / cm. The bottom of the oscillator ball is fixed to the top of the oscillator spring 6 and connected to the pull ring 15 by the cable 7. The scale 12 can be used to calibrate the compression length of the oscillator spring 6. The impact point of the oscillator is exactly aligned with the center of the force platform 3. A normally open photoelectric switch is fixed along the upward movement stroke of the oscillator, and the switch wire is connected to the vibration acquisition instrument 8 through a wire.

[0046] To test the frequency response characteristics of the magnetoelectric sensor, a normal sensor with the same specifications as the sensor under test was selected as a reference sensor. The magnetoelectric sensor under test and the reference sensor were fixed symmetrically on a force-bearing platform, and their output signal terminals were connected to the input terminal of a vibration acquisition instrument. The oscillator was pulled down by a pull ring; the compression length of the oscillator spring was displayed on a scale. After the spring was compressed to the specified length, the pull ring was released, and the oscillator spring rebounded, pushing the oscillator upwards to impact the center of the bottom of the force-bearing platform, thus exciting vibration. Before exciting vibration, the oscillator transmitted a trigger signal to the vibration acquisition instrument, which then began recording the vibration numerical signals output by the two sensors for a certain period. The amplitude spectrum characteristics of the two vibration numerical signals were calculated using Fourier transform analysis. The admittance spectrum was calculated from the amplitude spectrum values, and the distribution of the admittance spectrum values ​​was analyzed to reflect the frequency response characteristics of the sensor under test.

[0047] To test the high-frequency response performance of the sensor, the PVC force-bearing platform can be replaced with a steel plate or its area can be reduced. To test the low-frequency response performance, the force-bearing platform can be replaced with a wooden platform or its mass and volume can be increased.

[0048] Figure 3 The display shows the impact vibration data acquired by the sensor under test and the reference sensor under the same pulse firing condition. This signal is a time-domain acquired signal, and after Fourier transform, two amplitude spectra can be obtained, as shown below. Figure 4 As shown. Further calculate the admittance spectrum of the sensor under test relative to the reference sensor using the formula, as follows: Figure 5 As shown in the figure, it can be clearly seen from the admittance spectrum that in the frequency range of 200-2000Hz, the admittance spectrum value is basically 1, indicating that the response performance of the sensor under test in this frequency range is basically the same as that of the reference sensor. In the frequency range of <200Hz, the admittance spectrum value is less than 1, about 0.5-0.8, indicating that the low-frequency response performance is not as good as that of the reference sensor, and the performance degradation is more obvious. In addition, in the frequency range above 2000Hz, the admittance spectrum value is much greater than 1. Based on the time domain seismic wave signal and spectral characteristics of the sensor under test, there is no obvious distortion, confirming that the high-frequency response performance of the sensor under test has been significantly improved.

[0049] Sensor dynamic performance testing based on time-domain impact response provides accurate reference for sensor comparison and selection due to its simple and efficient testing and evaluation methods.

[0050] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0051] Furthermore, if the present invention discloses or relates to mutually fixedly connected components or structural parts, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral molding process).

[0052] Furthermore, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this invention include states or shapes that are similar to, analogous to, or close to those states or shapes. Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured using a one-piece molding process.

[0053] The above embodiments are merely illustrative examples to clearly illustrate the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A sensor response performance test system characterized by: The device includes a cantilever beam (1), a load-bearing platform (3) horizontally suspended below the cantilever beam (1) by a suspension spring assembly (2), a spherical impact oscillator (4) located directly below the load-bearing platform (3), and an impact assembly that drives the spherical impact oscillator (4) to move upward to apply a vertical impact load to the load-bearing platform (3). The impact assembly includes a base (5), an oscillator spring (6) mounted on the base (5), and a cable (7) that drives the oscillator spring (6) to compress. The bottom end of the spherical impact oscillator (4) is fixedly connected to the top end of the oscillator spring (6). Several sensors are provided on the upper surface of the force-bearing platform (3). The force-bearing platform (3) is also provided with a multi-channel vibration acquisition instrument (8) for acquiring the time-domain vibration signal of the sensors and a normally open inductive switch (9) for controlling the operation of the multi-channel vibration acquisition instrument (8). The normally open inductive switch (9) can be triggered when the spherical impact oscillator (4) moves toward the force-bearing platform (3). Several sensors are arranged in a ring array with the impact point of the spherical impact oscillator (4) as the center. One of the sensors is a reference sensor (10), and the rest are sensors to be tested (11).

2. The sensor response performance test system of claim 1, wherein: The suspension spring assembly (2) includes at least three suspension springs. The force-bearing platform (3) is circular in shape. The at least three suspension springs are arranged in a ring array on the force-bearing platform (3) with the center point of the force-bearing platform (3) as the center.

3. The sensor response performance testing system according to claim 2, characterized in that: The impact direction of the spherical impact oscillator (4) is exactly aligned with the center of the force-bearing platform (3).

4. The sensor response performance testing system according to any one of claims 1-3, characterized in that: The base (5) is also provided with a scale (12) for measuring the compression of the oscillator spring (6).

5. The sensor response performance testing system according to any one of claims 1-3, characterized in that: An adjusting screw (13) is vertically provided on the base (5). The adjusting screw (13) is threadedly connected to the threaded through hole on the base (5). The vibrator spring (6) is fixedly installed on the top of the adjusting screw (13).

6. The sensor response performance testing system according to claim 5, characterized in that: The cable (7) passes through the inner cavity of the vibrator spring (6) and the wire hole (14) of the adjusting screw (13) in sequence, and then connects to the pull ring (15).

7. The sensor response performance testing system according to any one of claims 1-3, characterized in that: The spherical impact oscillator (4) is made of aluminum alloy.

8. The sensor response performance testing system according to any one of claims 1-3, characterized in that: The inductive switch is a photoelectric switch.

9. A method for testing sensor response performance, using the sensor response performance testing system according to any one of claims 1-8, characterized in that: The oscillator spring (6) is compressed to a predetermined length by the cable (7), and then the cable (7) is released. The impact oscillator moves upward under the elastic force provided by the oscillator spring (6) and triggers the normally open inductive switch (9), causing the multi-channel vibration acquisition instrument (8) to start the acquisition work. As the impact oscillator moves upward, it impacts the force table (3) and excites vibration. The multi-channel vibration acquisition instrument (8) acquires the time-domain vibration signals of all sensors, calculates and obtains the admittance spectrum of all the sensors under test relative to the reference sensor (10) one by one: Where B(f) is the spectrum of the vibration signal in the time domain of the sensor under test, C(f) is the spectrum of the vibration signal in the time domain of the reference sensor, E(f) is the admittance spectrum, and |.| is the modulus or absolute value calculation symbol. The dynamic response performance of each sensor under test in various frequency bands is obtained from the admittance spectrum data characteristics; among them, If the admittance spectrum is a horizontal straight line with an approximate value of 1 in the corresponding frequency band, the dynamic response performance of the sensor under test is considered to be normal across the entire frequency band. If the admittance spectrum in the corresponding frequency band is less than 1, the response performance is considered to be defective and the sensor performance is reduced. If the admittance spectrum value in the corresponding frequency band is greater than 1, the response performance is considered to be improved compared to the reference sensor.

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