29results about How to "Improve detection resolution" patented technology

The invention discloses a polymer dual-band refractive index sensor based on a continuous domain bound state and a manufacturing method of the polymer dual-band refractive index sensor. The sensor comprises a silicon dioxide substrate and polymer metasurface structure units distributed on the upper surface of the silicon dioxide substrate in an array mode. Each polymer metasurface structure unit comprises four positive polygonal cylinders and a cylinder, the four positive polygonal cylinders are identical in size, the positive polygonal cylinders and the cylinder are perpendicular to the silicon dioxide substrate, the positive polygonal cylinders are arranged in a matrix mode, and the cylinder is located in the center of the four positive polygonal cylinders. The introduction of the central cylinder not only breaks the structural symmetry to excite the quasi-BIC, but also enhances the coupling effect among the four straight square columns, thereby greatly improving the near-field enhancement effect. The refractive index sensor has the characteristics of double quasi-BIC sensing wavebands, high sensitivity, high Q value, polarization insensitivity and the like, and the detection efficiency, flexibility and accuracy of the refractive index sensor in the biomedical field are improved.

The invention belongs to the technical field of optical fiber gas sensing, and discloses an optical fiber photoacoustic gas sensing system and method suitable for a low-pressure environment. The system comprises a programmable logic gate array circuit, a distributed feedback laser, a laser transmission optical fiber, an optical fiber photoacoustic sensing probe, a super-radiation light-emitting diode light source, an optical fiber circulator and a spectrograph. The air pressure is monitored according to the linear relation between the resonance frequency of the cantilever beam and the ambient air pressure, the characteristic that the acoustic sensitivity at the resonance position of the cantilever beam is enhanced under the low air pressure is utilized to make up for signal attenuation in the photoacoustic excitation process, and the sensitivity is corrected in combination with the air pressure measured by the cantilever beam. Therefore, high-precision and high-sensitivity detection of trace gas in a low-pressure environment is realized. The system only adopts a single cantilever beam and a single demodulator, has the functions of gas pressure and gas concentration detection, and can realize accurate detection of trace gas in a gas pressure change environment. And an all-fiber scheme is adopted, so that intrinsic safety is realized, and remote measurement and multi-point network group detection are easy.

The invention provides an insulating glove air tightness detector and a use method thereof. The insulating glove air tightness detector comprises an inflating device, a box body and a plurality of standard gloves. The box body is provided with a gas pipeline and a control module. The control module comprises an MCU and a timer. The MCU is provided with a preset differential pressure value, a plurality of inflating times t1, a pressure stabilizing time t2, a first pressure holding time t3 and a second pressure holding time t4. The box body is provided with an air inlet, a standard glove interface, a glove interface to be tested, an exhaust port, a model setting key and a display device. The gas pipeline comprises a first pipeline, a second pipeline and a third pipeline. The first pipeline is provided with a first pressure holding valve, the second pipeline is provided with a second pressure holding valve, the third pipeline is provided with a differential pressure sensor, the standard glove interface is provided with an external thread, the plurality of standard gloves are provided with an internal thread matched with the external thread, the glove interface to be tested is provided with an annular positioning groove, and the annular positioning groove is provided with an elastic sleeve for tightly covering the insulating glove to be tested on the glove interface to be tested, so as to detect insulating gloves of different models.

The invention relates to the field of special equipment detection, in particular to a digital-based special equipment sensing information processing system and method.The digital-based special equipment sensing information processing system comprises a film cultivation module, a classification excitation module, a high-temperature stabilization module, a sound wave control module and a matrix analysis module; the classification excitation module is used for performing annealing treatment on a film to different degrees and recovering excitation sound waves; the high-temperature stability module is used for fitting a thermal stability function of the film; the sound wave control module is used for matching a to-be-detected material and an ultrasonic sensor; the matrix analysis module is used for adjusting excitation current and analyzing material stress; the preparation process and the production process of the ultrasonic piezoelectric film can be optimized, the production efficiency and the product quality are improved, meanwhile, the sensing performance of the ultrasonic piezoelectric film is improved, the detection sensitivity and the resolution of sound waves are enhanced, and more efficient sound wave excitation and sensing functions are achieved.

The invention provides an optical fiber image transmission element for ultraviolet detection and a preparation method and application thereof, and the preparation method comprises the steps: carrying out the pickling of the cross section of one end of the optical fiber image transmission element, enabling the cross section to form a microporous structure with the depth of 10-50 [mu] m, and obtaining a pickled optical fiber image transmission element; a fiber core of the optical fiber image transmission element is made of an easily acid-etching material, and a cladding is made of an acid-etching-resistant material; the preparation method comprises the following steps: dissolving CsX and PbX2 in an organic solvent to obtain a precursor solution; wherein X is at least one of Cl, Br and I; the precursor solution is heated, gas is introduced, the gaseous precursor solution is brought to the microporous structure, the precursor solution reacts at the microporous structure in a gaseous form to generate CsPbX3 quantum dots, the microporous structure is filled, and a filled optical fiber image transmitting element is obtained; and the protection window is arranged on the filling surface of the filling optical fiber image transmission element, so that the optical fiber image transmission element for ultraviolet detection is obtained, the optical fiber image transmission element has the advantages of high brightness and high resolution, and the efficiency and the resolution of an ultraviolet detector can be effectively improved.

The application discloses a tunnel boring machine space dynamic compensation seismic wave advanced detection method and system, comprising: receiving the reflection echo data of the current space position; compensating the reflection echo data according to the attenuation compensation factor of the current space position, wherein the attenuation compensation factor of the current space position is obtained by a trained neural network, and the prediction process comprises: after curve fitting of the attenuation compensation factor of the reflection echo data of the detected space position, the attenuation compensation factor of the next space position is predicted by using the trained neural network; the compensated reflection echo data is subjected to geological body imaging by using the equal travel time imaging method, and the geological body detection result is obtained according to the amplitude difference on the imaging profile. The space dynamic compensation algorithm of the mechanical wave attenuation is used to adaptively correct the attenuation compensation factor at the next tunneling surface, so as to compensate the received reflection echo data and enhance the identification ability of the reflection echo.

The application relates to the technical field of size detection, and more specifically discloses a supercharger sealing ring opening size precision detection device which comprises a lower base and an upper cover plate. The lower base comprises a base body, the upper surface of the base body is provided with a detection inclined groove, the detection inclined groove corresponds to the position of a detection groove, the lower base and the upper cover plate are fixed through locking assemblies, a lower mold groove is arranged at the middle position in the base body, a plurality of storage grooves are arranged at the outer side, and the lower mold groove is used for fixing a detection module in use. The double amplification method of'mechanical lever amplification + laser measurement' is adopted, which is favorable for greatly improving the detection resolution of the tiny gap. During detection, the cutting edge contact rod of the cutting tip part directly contacts the sealing ring opening, the tiny gap change is amplified through the lever ratio, the amplified displacement amount is captured in real time by the handle part through the laser generator, and the ultra-precise measurement of the opening gap is realized.

The invention discloses an SPECT imaging device, an SPECT imaging system and a diagnosis combination. The SPECT imaging device comprises a rack and a nuclear detector group. The rack is provided with a through hole for a detected object to pass through. The through hole has a central axis. The nuclear detector group is arranged on the end face of the rack and comprises a plurality of longitudinal detectors arranged on the upper side and the lower side of the central axis and a plurality of transverse detectors arranged on the left side and the right side of the central axis, and the longitudinal detectors are used for obtaining longitudinal images of a detected object; the plurality of transverse detectors are used for acquiring a transverse image of the detected object, and the distance between the longitudinal detector and the central axis is smaller than that between the transverse detectors and the central axis. According to the SPECT imaging device, the collection efficiency is improved, the sensitivity is improved, and the resolution ratio of a detection image is improved.

The application provides a multifunctional liquid detection method based on array tag coupling interference suppression, which comprises the following steps: arranging an RFID tag array and an RFID reading device on both sides of the liquid to be detected within a set range; collecting a radio frequency signal to obtain original signal data affected by the liquid dielectric constant and mutual coupling effect between the tags; obtaining preprocessed signals; processing the preprocessed signals by using a coupling interference suppression algorithm, modeling and quantifying the mutual coupling effect, stripping the signal distortion caused by the mutual coupling effect from the preprocessed signals, and obtaining pure signal eigenvalues; and inputting the signal eigenvalues into a pre-trained classification and recognition model to obtain the type or concentration detection result of the liquid to be detected; by eliminating the main interference source of the multi-tag sensing, the extracted signal characteristics can more truly reflect the dielectric properties of the liquid, thereby greatly improving the detection accuracy and significantly improving the detection precision and resolution.

The utility model discloses a powder strength testing device, contain: base, powder determination module, powder determination module sets up on the base for placing and moving powder, powder measurement module, powder measurement module sets up on the base for detecting the powder intensity on powder determination module from horizontal direction, observation module, observation module sets up the top of powder determination module and powder measurement module for observing and gathering the process of powder measurement, control module, control module and powder determination module, powder measurement module and observation module electric connection. The utility model creatively changes the probe pressure intensity direction of powder measurement from vertical to horizontal, overcomes the influence of the self weight of particle needle and other structures, greatly improves the detection resolution of the extremely small destructive force to soft particles, and the minimum resolution can reach below 0.01 muN.

The utility model relates to a kind of tunnel construction dust detection devices including sampling gas path, dust detector based on light signal and signal transmitter;Sampling gas path, including air inlet pipeline, optical observation cavity and air outlet pipeline;Dust detector, including the light source of setting at the optical observation cavity of sampling gas path, light path and sampling gas path are orthogonal;Area array photoelectric detector is connected with transmitter electric signal;Signal transmitter, including radio frequency antenna, for the signal of area array photoelectric detector received is sent to the receiving end of collected data.The tunnel construction dust detection device provided by the utility model realizes the real-time dust detection of anti-interference by sealing, independent sampling gas path and independent, isolated light signal path relative to sampling gas path.Optimized scheme, detection laser is shaped into narrow light spot, adopts double-wavelength detection, cooperates with impact type pre-separator, realizes the dust detection resolution improvement of different dimensions such as detection time, detection granularity.

The application discloses a hot oil abrasion test equipment for a rolling friction sleeve of an electronic disconnector, which comprises a tool seat, a tool frame and a main shaft shafting, the friction sleeve is detachably connected to the main shaft shafting, an oil bath heating box for placing the friction sleeve is arranged on the tool seat, a driving piece for driving the main shaft shafting to rotate is arranged on the tool frame, a secondary friction assembly for cooperating with the friction sleeve is arranged on the oil bath heating box, a loading structure for providing a controllable loading force to the secondary friction assembly and accurately detecting the micro-abrasion displacement of the secondary friction assembly is arranged on the tool frame, and an eccentric posture adjusting structure for adjusting the relative position and angle of the secondary friction assembly is arranged on the oil bath heating box. The application solves the problem that the prior art lacks a special test equipment for the rolling friction sleeve of the electronic disconnector of a new energy vehicle, so that the high-temperature hot oil lubrication, rotating operation, controllable load and eccentric posture multi-parameter coupling working conditions of the real work cannot be reproduced synchronously.

The invention relates to the field of infrared detection, in particular to a photovoltaic infrared detector and infrared detection equipment, which comprises an N-type doped layer and a P-type doped layer which are stacked, the N-type doped layer and the P-type doped layer form a photoelectric detection PN junction and a voltage stabilization PN junction which are opposite in direction. The photovoltaic infrared detector works under a bias voltage, and the forward conduction direction of the voltage stabilizing PN junction is the same as the direction of the bias voltage. According to the photovoltaic infrared detector, when external bias voltage fluctuates, due to the fact that the voltage stabilizing PN junction has the voltage dividing effect, voltage fluctuation on the photoelectric detection PN junction can be weakened, output signal fluctuation caused by dark current along with bias voltage fluctuation is reduced, noise is lowered, the detection resolution of the photovoltaic infrared detector is improved, and in addition, under the illumination condition, the detection resolution of the photovoltaic infrared detector is improved. The number of carriers in the photoelectric detection PN junction is increased, and the forward resistance corresponding to the voltage stabilization PN junction is greatly reduced, so that the influence of the additional arrangement of the voltage stabilization PN junction on the light response is very small.

The invention discloses a coil-only electromagnetic ultrasonic phased array detection device and method for high-temperature castings and forgings, wherein the device includes a coil-only electromagnetic ultrasonic probe and a multi-channel coil-only electromagnetic ultrasonic detection circuit; the coil-only electromagnetic ultrasonic probe includes a probe housing, a corundum sheet, an interface and a plurality of coils, the corundum sheet is arranged at the bottom of the probe housing, a plurality of coils are arranged in an array above the corundum sheet, and the plurality of coils are electrically connected to the interface; the multi-channel coil-only electromagnetic ultrasonic detection circuit is connected to the interface, and is used to continuously pass a quasi-DC current to the plurality of coils while sequentially passing a strong pulse current into each coil in a preset order, and to detect the echo signal received by each coil. It does not have a permanent magnet, has a small size, and has a high energy conversion efficiency. It can be detected in a small space, and will not be weakened or dissipated in a high-temperature environment because the residual magnetic induction intensity of the permanent magnet is affected by the Curie temperature, and can perform imaging detection on the internal defects of high-temperature castings and forgings.

The present invention discloses a terahertz radar system based on chaotic signals, comprising: a signal transmission link and a signal receiving link, wherein the signal transmission link is used to generate and transmit a terahertz chaotic signal to a target object, and the signal receiving link is used to process and obtain perception information based on the reflected signal of the terahertz chaotic signal acting on the target object. The radar system provided by the present invention uses a flexible optical architecture to generate a terahertz chaotic signal as a radar detection signal, which can improve the radar detection accuracy and clarity, and at the same time improve the safety and anti-interference of the radar system.

The application relates to the technical field of hydrogen concentration optical visual detection, in particular to a hydrogen concentration detection device which comprises a detection table, an optical testing device body arranged on the detection table, a detection pipeline body in communication with one end of the optical testing device body, visual detection of a to-be-detected gas by the optical testing device body after the to-be-detected gas enters the detection pipeline body, a joint, a mixing assembly, a buffer assembly, a speed reduction assembly and a reflection assembly arranged in the detection pipeline body in sequence along a gas entering direction; the mixing assembly, the buffer assembly, the speed reduction assembly and the reflection assembly are arranged in the detection pipeline body in sequence, and the optical testing device body is combined with the optical regulation and control means of a beam splitter and a concave lens, the problem of uneven hydrogen distribution is solved through the mixing assembly, the gas flow rate is reduced and the contact time is prolonged through the buffer and speed reduction assembly, and finally the optical path is significantly prolonged through the optical assembly, and the detection signal is enhanced.

The invention belongs to the technical field of oil and gas intelligent drilling, and particularly relates to an electromagnetic wave adaptive frequency selection method, system and device. The method comprises the following steps: receiving a starting instruction, and sending a sweep frequency emission control decision; an echo signal is read, and the optimal working frequency is determined according to the echo signal; the echo signal is a result returned by emitting electromagnetic waves according to the frequency sweep emission control decision; sending out an optimal work control decision according to the optimal work frequency; the optimal work decision is used for guiding the work content executed by the electromagnetic wave adaptive frequency selection device in the current bottom layer environment. After entering a reservoir stratum, a high-frequency electromagnetic wave transmitting circuit performs frequency sweeping within a certain bandwidth, a receiving end detects the strength of a direct wave signal, the corresponding frequency when the strength of the received direct wave signal is the highest is the optimal working frequency of a transceiving antenna, and the information is fed back to the high-frequency electromagnetic wave transmitting circuit; and then transmitting at the same frequency.

The present invention discloses a reagent for detecting ApoE gene and its application; the reagent comprises a primer set, the primer set comprises a forward common primer Frh for detecting ApoE gene site 112 and ApoE gene site 158, a reverse primer Rrh1 and a reaction primer Rrh2 for detecting ApoE gene site 158. The present invention obtains a reagent for ApoE gene detection and typing through creative design and screening, and by introducing rhPCR amplification, amplification forms fewer primer dimers, has high sensitivity, good specificity, significantly reduces amplification false positives, has high detection resolution, high throughput, is simple and easy to operate, is easy to automate, and has professional software to interpret the results.

The invention provides a ground penetrating radar transmitting voltage dynamic adjusting system which adopts a transmitting antenna subsystem and a receiving antenna subsystem which are arranged in a split mode. Through the FPGA chip, the digital potentiometer is adjusted to reduce the level of the high-voltage power supply under the condition that the range of the analog-to-digital converter is full and / or the direct wave is saturated, and the digital potentiometer is adjusted to increase the level of the high-voltage power supply under the condition that the range of the analog-to-digital converter is not full and / or the direct wave is unsaturated, so that the ground penetrating radar can better adapt to different geological conditions. The signal-to-noise ratio of the signal is improved, the detection resolution is further improved, different detection tasks can be quickly responded, and hardware replacement or complex setting does not need to be carried out.

This invention belongs to the field of carbon fiber winding technology for hydrogen storage cylinders, specifically a multi-layer integrated high-pressure hydrogen storage cylinder winding device, including a process plug. A main body unit is externally mounted on the process plug, and a positioning unit is internally mounted on the main body unit. A detection unit is coaxially mounted on one side of the process plug. This invention utilizes the linkage structure between the T-segment column, the inverted surface open ring, and the convex engagement column to convert the pressure loss corresponding to a single weak jump into an accumulated axial mechanical displacement. By adjusting the actual meshing ratio between the planetary gear and the gear ring, as well as the pitch of the spiral groove on the outer wall of the angle rod, it achieves axial differential displacement output from the two actuators. This causes the axial movement speed of the trigger limit column to lead the axial movement speed of the T-segment column, converting the accumulated axial displacement into a progressive rotary feed motion. Only when the accumulated jump degradation reaches the process-set threshold is an alarm and intervention action triggered through mechanical contact between the electrode column and the electrode sensing rod.

The invention discloses a double-plasma metal synergistic metal organic framework composite SERS (Surface Enhanced Raman Scattering) substrate as well as a preparation method and application thereof in diazepam detection, and belongs to the technical field of drug detection. The SERS substrate is Ag (at) ZIF-8 (at) Au, and is specifically prepared by the following steps: mixing an Ag (at) ZIF-8 solution and an AuNPs solution, violently stirring, then standing for reaction, and obtaining the Ag (at) ZIF-8 (at) Au after the reaction is finished. The SERS substrate has good sensitivity, uniformity, reproducibility and storage stability and can be used for sensitive and efficient detection of diazepam, the detection limit is as low as 0.126 ng / mL, and the detection linear range is wide and reaches 10 <-2 >-10 <-9 > g / mL.

The invention belongs to the technical field of infrared thermal wave imaging, and particularly relates to a blind structure polarization modulation infrared thermal wave super-resolution imaging detection system and method, and the system comprises an infrared camera, a processor, a signal generator, a power amplifier, a semiconductor laser, and a structured light modulator. A super-resolution detection image is reconstructed through instantaneous phase difference images of thermal wave signals and linear frequency modulation signals under different spatial polarization phases, and the spatial resolution of infrared thermal wave imaging for detecting tiny defects and complex edge defects is improved.

The invention relates to the technical field of alloy internal defect detection, in particular to a method for detecting metallurgical defects in high-temperature alloy. The method for detecting the metallurgical defects in the high-temperature alloy comprises the following steps: S1, carrying out ultrasonic detection on a to-be-detected high-temperature alloy workpiece, and determining initial position information of the metallurgical defects; s2, sampling the high-temperature alloy workpiece to be detected according to the initial position information to obtain a sample A; s3, the sample A is subjected to industrial CT detection, and accurate position information of metallurgical defects in the sample A is determined; s4, performing finish machining on the sample A according to the accurate position information to obtain a sample B; and S5, the sample B is subjected to multiple times of grinding and polishing corrosion treatment, low-magnification microscope pictures of the sample B after each time of grinding and polishing corrosion treatment are collected, and after analysis, the three-dimensional morphology of the metallurgical defect is obtained. According to the detection method, comprehensive and accurate detection and evaluation on the metallurgical defects in the high-temperature alloy are achieved, and the complete three-dimensional morphology of the metallurgical defects can be obtained.

The invention relates to a linear array active synthetic aperture long-distance detection method, device and equipment, and the method comprises the steps: S1, orthogonal signal emission control: fixedly setting a cyclic emission period of an orthogonal signal group according to the farthest detection distance to be realized by a linear array; according to the linear array forward distance required for avoiding space undersampling and the navigational speed monitored in real time, the sequential transmitting period of each orthogonal signal is dynamically controlled, and each transmitting period and the navigational speed corresponding to the transmitting period are recorded. According to the method, the constraint of the aperture length of the linear array on the detection distance of the synthetic aperture can be overcome, the active synthetic aperture long-distance detection is realized by using the small-size linear array, and the detection resolution of a long-distance target is remarkably improved on the premise of avoiding the interference of direct waves of orthogonal signals.

The invention relates to the technical field of part measurement, and discloses a mechanical part light source detection device which comprises a fixed table, a support and a camera module, the support is fixedly arranged on the fixed table, the camera module is assembled at the top end of the support, a mounting plate is coaxially and fixedly assembled on the camera module, and an annular lamp strip is coaxially and fixedly mounted on the mounting plate. A light gathering cover is arranged below the lamp strip, a sealed liquid cavity filled with light-transmitting liquid is formed in the light gathering cover, air cavities are formed in the upper portion and the lower portion of the liquid cavity, flexible and transparent diaphragms are arranged between the air cavities and the liquid cavity, and a plurality of air pressure pipes for controlling air pressure in the air cavities are installed on the air cavities. The irradiation range of the light source of the lamp strip is changed by adjusting the pressure difference between the air cavity and the liquid cavity, when the light source is insufficient, the pressure of the air cavity is increased to form a biconcave lens, light rays are diverged, and the irradiation range is expanded; when the light source is too large or insufficient in brightness, the pressure of the air cavity is reduced to form a biconvex lens, light is focused, and the illumination intensity and resolution are enhanced.

The utility model relates to hand button appearance inspection technical field, concretely relates to a hand button high accuracy appearance inspection line body device of bottom light source supplementing. Including detection station, the center position fixed mounting of detection station upper side wall annular guide rail, the top of annular guide rail sliding installation has several equidistance distribution's fixed plate, the top fixed mounting of fixed plate has the bearing station. The utility model, through setting the square light source located in the industrial camera right below, when the bearing station moves to the detection station, the light of square light source penetrates the through -hole directly and irradiates the car button shell bottom, carries out the full light supplement to the inside light guide plate, has strengthened the light and dark contrast of light guide area and shell surface, makes the industrial camera can clearly capture the demarcation between light guide plate and car button shell, thereby realizes the high accuracy measurement of the position relation between laser engraving pattern and light guide plate trepanning, promotes the detection resolution and accuracy.

The AR laser emitter and the AR device are disclosed. The AR laser emitter comprises a speckle structure, two L-shaped support frames and a vertical cavity surface laser emission module. The two support frames are oppositely arranged. The speckle structure is arranged on the side of the two first arms away from the second arms. The vertical cavity surface laser emission module is arranged on the side of the two second arms close to the first arms. The opening between the two first arms is a first light outlet. The opening between the two second arms is a second light outlet. The vertical cavity surface laser emission module is used to generate a first laser and emit it towards the first light outlet. The vertical cavity surface laser emission module is also used to generate a second laser and emit it towards the second light outlet for eye tracking. The speckle structure is used to generate speckle structure light according to the first laser for 3D modeling. The AR laser emitter has the characteristics of simple structure, small size, high detection resolution and accurate detection.

The invention relates to the technical field of quantum sensing, and provides an array sensing unit and a quantum detection probe wherein the quantum sensing unit comprises a transparent substrate, an entrance port, a reflective medium and a filtering medium; according to the array sensing unit, wide-field measurement can be achieved, overall information of a defect area can be obtained, meanwhile, the array type measurement structure can extend the measurement range in the longitudinal direction, and it can be guaranteed that the NV color center is fully irradiated by independent lighting of each detection area; according to the quantum detection probe disclosed by the invention, the adaptive combination of the wide-field camera, the objective lens and the array sensing unit is used, so that fluorescent light in extremely small pixels can be distinguished and detected, and the detection resolution can be improved.

The present application belongs to the field of capacitive displacement sensing test, and specifically discloses an inertial sensor probe device and a multi-degree-of-freedom detection method, including a test mass, a capacitor plate and a plate frame, and also includes a signal injection and detection circuit connected to the capacitor plate; the test mass is located in the plate frame, and the capacitor plate is arranged on the surface of the plate frame; the capacitor plate includes multiple groups of capacitor plate pairs, and the multiple groups of capacitor plate pairs are arranged along the x-axis, y-axis and z-axis respectively; the capacitor plate pair is used to detect the displacement transformation of the test mass along any translational degree of freedom of the x-axis, y-axis or z-axis, so as to realize signal sensing, signal feedback and signal injection; the signal injection and detection circuit is used to inject carrier voltage signals of different frequencies into the capacitor plate pair, and obtain the signal generated by the relative displacement between the test mass and the capacitor plate pair. Through the present application, the plate structure can be simplified, the plate symmetry can be improved, and the detection error can be reduced.