169 results about "Differential measurement" patented technology

The invention relates to the technical field of industrial automation control, in particular to a container liquid level measurement method, system and equipment of a pressure sensor and a medium, and provides a method for eliminating gas phase pressure influence based on a double-sensor differential measurement mechanism and dynamically correcting liquid density and sensor drift errors in combination with a temperature compensation model. The temperature data are linked in real time through a three-dimensional compensation function, density calculation and drift correction are synchronously adjusted, and multi-parameter dynamic decoupling and self-adaptive compensation are achieved; a collaborative measurement mechanism is adopted to integrate bottom and top sensor data, and a built-in temperature probe and a preset threshold are combined to complete multi-source signal fusion and compensation calculation; a dynamic calibration method is designed, and system errors are eliminated through reference pressure point calibration and structure coefficient correction; constructing a closed-loop signal processing flow, and integrating high-precision analog-to-digital conversion, digital filtering and real-time algorithm to output a compensated liquid level value; the method improves the measurement precision and stability, and is suitable for temperature change, gas phase pressure fluctuation and multi-medium scenes.

The invention belongs to the technical field of signal synchronization, and discloses a multi-camera anti-shake time sequence synchronization control system and method based on an FPGA. The method comprises the following steps: taking an FPGA as a core, generating an FSYNC signal as a camera exposure reference, and obtaining a delay value through a timestamp and differential measurement; acquiring I MU data and obtaining a global motion vector through a gradient descent algorithm; analyzing by combining the two to obtain phase deviation and feeding back the phase deviation to the FPGA, and adjusting the FSYNC signal by combining the global motion vector by the FPGA according to the phase deviation; according to the method, nanosecond timestamp recording is realized through a homologous clock reference and hardware-level signal binding mechanism, and the limitation of dependence on static time difference compensation in the prior art is broken through in combination with global motion vector analysis and dynamic phase offset adjustment.

The invention discloses an error correction method and device for non-intrusive voltage differential measurement, a medium and a product, and relates to the technical field of voltage measurement, and the method is applied to a scene in which a differential electric field sensor array is arranged in a set range with a measured conductor as the center. Comprising the following steps: constructing an initial correction model based on a sensor distance and a measured conductor voltage; under the actual working condition, the initial correction model is processed through a least square method, and a correction model is obtained; when non-intrusive voltage differential measurement is carried out, the current measured conductor voltage and the sensor distance are obtained, and a correction coefficient is determined by adopting the correction model; and completing error correction of non-intrusive voltage differential measurement based on the correction coefficient. According to the invention, the complexity of an inversion algorithm and the special requirement on the spatial position of the sensor can be reduced.

The invention discloses a method for measuring a detection inclination angle of a two-component atomic shearing interferometer. The method comprises the following steps: constructing an inclination angle set of an angle swinging device; when the atoms are acted by the pi Raman laser and the second pi / 2 Raman laser, the reflecting mirror rotates by an angle; alternately detecting multiple groups of odd-numbered groups and even-numbered groups; traversing all dip angles in the dip angle set; and fitting and calculating the actual included angle of the longitudinal direction of the imaging surface of the CCD camera relative to the Z-axis direction. The invention further discloses a measuring device for the detection inclination angle of the two-component atom shearing interferometer. According to the method, an existing atom shearing interferometer can accurately measure the inclination angle of a detection system of the atom shearing interferometer, so that the problems of noise and system errors caused by the fact that the inclination angle of the detection system of the atom shearing interferometer does not return to zero are solved, and drifting of differential measurement of the two-component atom interferometer caused by inclination angle changes is restrained.

A wearable device to measure a user's physiological parameters comprising one or more biosensors, as well as a light source comprising light emitting diodes, lenses for directing light towards tissue of the user comprising blood vessels, and a detection system receiving reflected tissue light. The physiological parameters, for example hypertension, are measured with a differential measurement. For example, the physiological parameters may be associated with pulse rate and blood flow. The output signal is associated with the physiological parameters, and artificial intelligence may be used in making decisions regarding the output signal. Signal-to-noise ratio of the output signal may be improved by synchronizing the detection system to the light source, increasing light intensity, and detecting a change. The wearable device is configured to determine that is being worn by the user and may be configured to communicate with a smartphone or tablet.

The invention discloses a linkage differential measurement system and method suitable for micro thrust calibration. The system comprises a linkage differential measurement rack, a liquid metal radio frequency coaxial cable connector arranged on the rack, and a mass center precise regulation and control device arranged on the rack. The linkage differential measurement system provides micro-Newton-level micro thrust except environment common-mode noise; the method comprises the following steps: a torsional pendulum inclination angle control module controls a torsional pendulum inclination angle # imgabs0 #; the centroid position deviation calculation module is used for calculating centroid position deviation; judging whether the offset s of the current centroid position is less than 10 [mu] m or not; the mass center position adjusting module is used for adjusting the mass center position; the gravitational wave micro-thrust calibration torsional pendulum solves the problems that the gravitational wave thruster needs to calibrate thrust noise besides calibrating thrust, high rigidity of a coaxial cable can generate interference on motion of the gravitational wave micro-thrust calibration torsional pendulum, and the gravitational wave micro-thrust calibration torsional pendulum has extremely high requirements on sensing precision of mass center regulation and control.

The invention discloses a transformer body fault comprehensive monitoring system and method based on optical fiber sensing, and belongs to the technical field of transformer monitoring. The transformer body fault comprehensive monitoring system comprises a self-compensation type optical fiber sensing module, a multi-path optical fiber penetrating device, an optical fiber signal demodulation analysis device, an optical switch and a fault monitoring host; the self-compensating optical fiber sensing module comprises a main sensing unit group and a reference sensing unit group, the main sensing unit group is used for monitoring temperature, stress, gas, partial discharge and vibration signals of the transformer, and the reference sensing unit group is deployed in a non-monitoring area outside the transformer; the main sensing unit group and the main sensing unit group form a differential measurement pair to generate a net signal for eliminating environmental interference; the fault monitoring host comprises a multi-parameter dynamic correlation analysis module and an abnormal mode identification module, and is used for carrying out correlation analysis on monitoring data of different sensing units, identifying abnormal signals, carrying out real-time comparison on the abnormal signals based on a correlation analysis result, and determining an abnormal type and a fault position of the transformer.

The invention discloses an underwater magnetic field measuring device based on a diamond NV color center. The underwater magnetic field measuring device comprises a diamond NV color center module, an incident laser excitation module, a multi-path optical coupling module, a microwave excitation module, a fluorescence acquisition and photoelectric conversion module, a signal processing and control module and a magnetic field module, the multi-path optical coupling module is used for dividing an optical fiber into multiple paths and collecting fluorescence generated by the diamond block; the microwave excitation module is used for switching between two single-quantum resonance frequencies to drive an NV color center to realize double-quantum DQ reading; and the signal processing and control module comprises an FPGA (Field Programmable Gate Array) processing unit of a field programmable logic array chip. According to the invention, a dual-quantum DQ working point of a diamond NV color center is used as a measurement channel, common-mode influence of D is removed through differential measurement, the problem of D drift caused by temperature drift, stress and material aging is physically and obviously inhibited, and the device can still realize ultrahigh-sensitivity measurement in a complex underwater environment.

The invention discloses a liquid crystal display filtering and light transmission performance monitoring system and a monitoring method thereof, and relates to the technical field of liquid crystal displays. An ambient light real-time monitoring module; a dual-optical-path differential measurement module; a signal processing and intelligent compensation module; a polarizer dynamic adjustment module; a data storage and analysis module; light intensity fluctuation data are collected in real time through an ambient light real-time monitoring module, reference light and transmission light are synchronously collected through a double-light-path differential measurement module, a signal processing and intelligent compensation module calls a self-adaptive algorithm library, compensation coefficients are calculated in combination with ambient light spectrum data, and a polaroid adjusting instruction is generated. And then an adjusting instruction is sent to the polaroid dynamic adjusting module through the CAN bus, the polaroid dynamic adjusting module feeds back an actual thickness value in real time after adjustment is completed, closed-loop control is formed, and through real-time compensation of ambient light and dual-light-path differential measurement, the influence of a station LED lamp and natural light is eliminated, and the monitoring precision of light filtering and light transmission performance is improved.

The invention discloses a gas concentration detection circuit and method based on differential measurement and reference compensation, and the circuit comprises at least one active gas sensitive element, the electrical parameters of which change along with the concentration of a target gas; the sensitivity of the reference gas sensitive element to the target gas is at least lower than that of the active gas sensitive element by a preset percentage threshold value; the active gas sensitive element and the reference gas sensitive element are connected in a differential pair form to form a differential signal generation unit; the differential amplification circuit is used for amplifying the differential signal output by the differential signal generation unit; the output signal of the differential amplification circuit is used for representing the concentration information of the target gas. According to the invention, environmental interference and baseline drift are directly and effectively suppressed from the hardware level, the stability and selectivity of gas concentration measurement are improved, and meanwhile, the holding circuit is simple in structure, low in cost and convenient for large-scale application.

The invention belongs to the technical field of flight control. The invention provides a specified time increment control method for an aircraft airflow angle under multi-fault interference. The method comprises the following steps: establishing an airflow angle and angular rate kinetic equation of an aircraft and converting the equation into a strict feedback linearization form; performing first-order Taylor expansion on the kinetic equation at the current sampling moment, and establishing a control-oriented incremental model; a specified time airflow angle controller and a specified time angular rate controller of an aircraft are designed based on a control-oriented incremental model and a specified time theory, and specified time control over the airflow angle of the aircraft is achieved. The embodiment of the invention has the advantages of simple structure and strong robustness, only needs the state differential measurement information and the control surface control derivative of the airplane, effectively reduces the dependence on the precise nonlinear term in the airplane model, and can still realize the precise airflow angle control at the specified time even under multiple faults.

Various aspects of the present disclosure relate to receiving a sensing configuration for sensing signal measurement and reporting, where the sensing configuration comprises an indication of a first propagation path and performing a first sensing measurement of the first propagation path in accordance with the sensing configuration. Aspects of the present disclosure may relate to performing a second sensing measurement of the second propagation path in accordance with the sensing configuration and transmitting a sensing measurement report comprising a differential sensing measurement based on the first sensing measurement and the second sensing measurement, where the differential sensing measurement indicates a difference in measured values associated with the first propagation path and the second propagation path.

The invention is applicable to the technical field of signal detection, and particularly relates to a high-frequency active differential signal probe and a control method thereof, a high-performance active differential probe is realized by using a high-performance operational amplifier, combining a low-ripple positive and negative power supply and combining a full-shielding shell through optimizing a circuit structure and using fewer devices; differential measurement of signals is realized, a low-cost differential probe is realized, and a signal measurement threshold is greatly reduced; the method has significance in promoting technical progress, has high measurement performance, and can meet most measurement requirements.

The invention belongs to the field of power equipment monitoring, and discloses a lightning arrester on-line monitoring system and method based on non-contact differential electric field probe self-adaptive compensation, a non-contact differential voltage probe is adopted, the sensitivity to environmental noise and interference to other-phase high-voltage buses is remarkably reduced through differential measurement, and the monitoring accuracy is improved. And the self-adaptive compensation algorithm is combined, so that the measured signal can be corrected in real time according to the on-site electromagnetic environment change, the amplitude and phase distortion can be effectively inhibited, the accuracy and reliability of the high-voltage side bus voltage acquisition can be improved, and the overall monitoring precision can be obviously improved. According to the invention, high-sensitivity and wide-dynamic-range measurement of lightning arrester current is realized by adopting the fluxgate weak current sensor, accurate detection under small signals is guaranteed, and fine analysis of harmonic components is facilitated.

The invention provides a thermal expansion coefficient measurement system and method based on light field regulation, and the system comprises a light field generation module which comprises a light source and a spatial light modulator which is used for modulating a light beam generated by the light source to generate a structured light field containing orthogonal stripes; the temperature control module is used for controlling the temperature of the to-be-tested sample; the detection module comprises a 4f optical assembly and a camera, the 4f optical assembly is used for processing a reflected light field generated after the structured light field projects the surface of the to-be-detected sample and then enabling the reflected light field to enter the camera, and the camera is used for imaging; the data processing unit is used for processing imaging data of the camera and calculating to obtain the thermal expansion coefficient of the to-be-detected sample. The programmable measurement light field is dynamically generated by adopting the SLM, and sample surface treatment is not needed; the three-dimensional deformation of the sample is inverted through the phase change of the light field, the environmental disturbance can be effectively eliminated in combination with the multi-wavelength differential measurement technology, and the measurement precision is improved.

The invention provides a differential confocal measurement system and method based on a spatial offset pinhole, and the system comprises an illumination unit and a confocal measurement unit which are disposed along a light path, and also comprises a differential measurement unit which is disposed in the emergent direction of a measurement light beam of the illumination unit. And the differential measurement unit is used for receiving the pre-focus photoelectric intensity signal and the post-focus photoelectric intensity signal of the reflected light beam of the measured object and acquiring the position information of the measured object, and the differential measurement unit comprises two paths of pre-focus differential assemblies and two paths of post-focus differential assemblies. According to the invention, an existing differential measurement system is improved into two paths of pre-focus differential assemblies and two paths of post-focus differential assemblies, and two paths of differential signals in the prior art are expanded into four paths of differential signals, so that the range of a linear interval is obviously expanded on the basis of keeping high-precision measurement of the original differential signals; and the measurement range is greatly expanded on the basis of keeping the measurement precision.

The invention relates to the technical field of optical design, and discloses a double-beam differential measurement device and method for the polarization sensitivity of a metasurface grating, and the method comprises the steps: dividing a pre-generated light beam into a first light beam and a second light beam through an optical fiber coupler, carrying out the dynamic switching of the polarization state of the second light beam, and obtaining a second incident light beam, adjusting the first light beam based on the second incident light beam to obtain a first incident light beam; enabling the first incident light beam to pass through a first path without the metasurface grating, enabling the second incident light beam to pass through a second path comprising the metasurface grating, and obtaining a first output light beam and a second output light beam; performing time domain difference on the first output light beam and the second output light beam, and calculating to obtain a multi-polarization-state differential signal; correcting the multi-polarization-state differential signal through a preset differential correction mechanism to obtain a corrected differential signal; calculating the polarization sensitivity of the metasurface grating according to the corrected differential signal; according to the invention, the accuracy of the calculated polarization sensitivity of the metasurface grating can be improved.

The invention discloses a differential measurement-based satellite-borne synthetic aperture microwave radiometer imaging correction method, which comprises the following steps of: respectively selecting a reference area and a correction area in a global range, and respectively intercepting scientific data and auxiliary data in a specific time period in the reference area and the correction area based on load normal earth observation data; averaging the visibility functions intercepted in the reference area to obtain a reference visibility function; generating a reference brightness temperature and a correction brightness temperature through a simulation model by using the auxiliary data intercepted in the reference area and the correction area respectively; performing difference and inversion processing on the normal earth observation visibility function to be subjected to imaging processing by using the reference visibility function to obtain a difference inversion brightness temperature; calculating a correction coefficient by using the reference visibility function, the reference brightness temperature, the visibility function intercepted in the correction area and the correction brightness temperature; and correcting and compensating the differential inversion brightness temperature by using the correction coefficient and the reference brightness temperature to obtain the final inversion brightness temperature.

The invention provides an epitaxial growth control method and device, computer equipment and a storage medium. The epitaxial growth control method comprises the following steps: irradiating a wafer to be measured and the surface of a reference irradiation surface by adopting a super-continuum spectrum laser light source to obtain a reflected light signal; synchronously scanning and filtering the reflected light signal to output two paths of narrow-band light; the two paths of narrow-band light are converted into electric signals and then differential operation is carried out, and the reflectivity of the wafer to be measured is calculated according to a differential result; and determining growth parameters of the epitaxial layer based on the reflectivity, and adjusting process parameters of the reaction cavity according to the growth parameters so as to control epitaxial growth of the wafer to be tested. According to the super-continuum spectrum laser light source, multiple characteristic wavelengths can be scanned in one process step, synchronous monitoring of multiple growth parameters is achieved, and the monitoring requirement of a complex epitaxial structure is met; in addition, common-mode noise in the measurement process is eliminated in real time through the double-beam differential measurement technology, the signal-to-noise ratio is greatly increased, the measurement precision is improved, and accurate control over epitaxial growth is achieved.

The invention relates to a tunnel tunneling advanced geology forecasting method, which comprises the following steps of: randomly selecting a cross section behind a tunnel face, arranging a measuring point in each of four directions on a tunnel rock wall, performing differential measurement between a central measuring point of the tunnel face and any measuring point on the tunnel rock wall, and taking the direction of the maximum signal difference in four groups of obtained electromagnetic response signal differences as a background direction; respectively obtaining electromagnetic response signal differences of the other three azimuth measuring points of the tunnel rock wall and the central measuring point of the tunnel face relative to the background azimuth measuring point according to the measurement results, comparing the four electromagnetic response signal differences, and selecting the response signal difference with the maximum absolute amplitude and the slowest amplitude attenuation along with time; and interpreting the orientation and distribution characteristics of the water-containing or ore-containing abnormal geology. According to the method, a double-differential measurement mode is adopted, primary field interference generated by a transmitting-receiving coil can be overcome, response background interference generated by surrounding rock can be eliminated, obtained response signal difference data has the extremely high signal-to-noise ratio, the higher resolution ratio is achieved for geological hidden dangers, and the detection result is more accurate and reliable.

The invention discloses a system and a method for measuring the thermophysical property of a soft material film. The system comprises a signal generator, a pump light path, a detection light path, a photoelectric detector, a signal processing module, a sample platform, a difference measurement module and a thermal parameter inversion unit. The system can be used for independently measuring the thermal conductivity, the specific heat capacity and the interface thermal resistance of liquid, gel and soft solid thin film materials at the same time on the premise that prior parameters are not needed. In combination with periodic heating of a square wave modulation heat source and a difference measurement strategy, high-precision measurement of micro-nano-scale thermophysical properties is realized, and the method is particularly suitable for various application scenes such as thermal interface materials (TIMs) and phase change energy storage materials.

The invention relates to the technical field of unmanned aerial vehicles, in particular to a signal interference method, system, equipment and medium for approaching and expelling of an unmanned aerial vehicle, and the method comprises the steps: carrying out the differential operation of the relative space distance between an own unmanned aerial vehicle and a suspicious unmanned aerial vehicle and the geological space distance between a ground control center and the suspicious unmanned aerial vehicle; differential measurement data is obtained; performing dynamic tracking on the differential measurement data by using a Kalman filtering algorithm to obtain tracking and positioning information of the suspicious unmanned aerial vehicle; when it is detected that the suspicious unmanned aerial vehicle enters a preset interference signal emission range, determining signal emission power and a signal emission angle vector according to the motion state information of the suspicious unmanned aerial vehicle; and generating an electromagnetic interference signal matched with the working frequency band of the suspicious unmanned aerial vehicle according to the signal transmitting power and the signal transmitting angle vector so as to interfere the suspicious unmanned aerial vehicle. By accurately measuring and dynamically tracking the position of the suspicious unmanned aerial vehicle, a matched electromagnetic interference signal is generated, and effective interference on the suspicious unmanned aerial vehicle is realized.

A method for advanced geological prediction during tunneling involves selecting a transverse section behind the tunnel face and placing a measuring point at each of four locations on the tunnel rock wall. A differential measurement is performed between the measuring point at the tunnel face center and any measuring point on the tunnel rock wall. The location with the largest signal difference among the four sets of electromagnetic response signal differences is used as the background location. Based on these measurement results, the electromagnetic response signal differences between the measuring points at three other locations on the tunnel rock wall and the measuring point at the tunnel face center relative to the background location are calculated. These four differences are then compared, and the response signal difference with the largest absolute amplitude and the slowest amplitude decay over time is selected to interpret the location and distribution characteristics of water- or mineral-bearing anomalies. This method utilizes a dual differential measurement mode, which overcomes both primary field interference generated by the transceiver coils and background interference generated by the surrounding rock itself. The resulting response signal difference data has an extremely high signal-to-noise ratio, provides higher resolution for geological hazards, and provides more accurate and reliable detection results.

The application discloses a kind of satellite-borne infrared emissivity differential measurement method and device using cold black background, belong to spacecraft thermal control and material on-orbit testing technical field, purpose is to eliminate environmental stray radiation and conduction heat leakage interference, realize material emissivity high-precision in-situ on-orbit test.The application relies on deep space cold black environment and differential disturbance thought, supporting layout emissivity known standard unit and unit to be measured, make two in consistent light thermal condition, respectively establish transient heat balance equation.Because two kinds of units are consistent, such as common-mode interference of stray radiation, conduction heat leakage, two formula difference can be removed interference term, only keep and emissivity related radiation heat loss term.Through the design of different thermal control conditions (such as balance heating, constant temperature control, dynamic heating), the real emissivity of the material to be measured is solved.The application is suitable for in-situ, high-precision measurement of the infrared emissivity of spacecraft surface materials, especially intelligent thermal control materials such as thermochromic materials in space environment.

The application discloses a ground absolute microwave ranging method and system based on double-path echo and RTK differential measurement, which can apply carrier phase ranging to absolute ranging. The system adopts RTK differential measurement to solve the phase integer ambiguity, especially simultaneously differentiates the observation values of two ends of the ranging main terminal, solves the extra error introduced by the traditional RTK double difference in the two-point transfer differential value, and finally compensates the error by using an atmospheric refraction correction structure model, so that the sub-millimeter level precision is achieved under the kilometer level measurement distance.

The application provides a celestial body orientation parameter solving method and system based on inverse VLBI interferometry and a medium. The method comprises the following steps: firstly, a rotation orientation physical model of a celestial body and an inverse VLBI differential measurement model are established, a lander coordinate and a celestial body orientation parameter are introduced into the model by combining the conversion between a non-inertial system and an inertial system coordinate. High-precision differential measurement tracking data of inverse VLBI are obtained, and based on the principle of the least square method, a lander position and a celestial body orientation model parameter are determined, so that the residual square sum between the calculated theoretical observation value of inverse VLBI and the ground observation value is minimum, and high-precision extraterrestrial celestial body orientation parameters are obtained. The application can realize precise positioning of a lander and solving of celestial body orientation parameters, the obtained data are high in precision, high-precision inverse VLBI differential measurement data can significantly improve the solving precision of the celestial body orientation model parameters, and then information about the internal structure and surface mass distribution change of the celestial body is provided, and additional constraints for the improvement of the celestial body physical model are provided.

The present invention provides a DPF pressure differential measurement value correction method, device, vehicle, and storage medium, belonging to the field of vehicle control technology. The method includes: obtaining a first DPF pressure differential measurement value after the vehicle is powered off, and judging whether a first correction condition is satisfied based on the first DPF pressure differential measurement value; when the first correction condition is satisfied, determining a correction coefficient based on the first DPF pressure differential measurement value; when the vehicle is powered on next time, obtaining a second DPF pressure differential measurement value before the engine is started, and judging whether a second correction condition is satisfied based on the second DPF pressure differential measurement value; when the second correction condition is satisfied, determining a pressure differential correction value based on the correction coefficient and the first DPF pressure differential measurement value, and correcting the real-time DPF pressure differential measurement value after the vehicle is powered on based on the pressure differential correction value. The present invention improves the environmental applicability and correction accuracy of the DPF pressure differential measurement value correction method.

The application discloses a bearing sealing structure internal defect nondestructive testing method and system, and relates to the technical field of nondestructive testing.The method comprises the following steps: before and after the start and end of a measurement task, calibrating a physical reference built in the system to calibrate and quantify system drift; during the scanning process, through a coaxial reverse differential measurement mechanism, real-time immunity to dynamic errors is generated to generate pretreated three-dimensional point cloud data flow; finally, through vector projection analysis of actual geometric distortion topological morphology and a predefined topological fingerprint representing a systematic aging mode, the diagnosis and compensation of the health state of the system itself are realized.Through an internal and full-cycle error defense system, the application can generate a three-dimensional model highly consistent with a physical entity, and the fidelity and long-term reliability of the detection result are improved.

The application provides a communication method, a communication device, a chip system and a readable storage medium. The method can include: receiving a first reference signal set from a network device at each transmission occasion of N transmission occasions; measuring the first reference signal set in each transmission occasion to obtain a measurement result and reporting a measurement report to the network device; the measurement result includes a measurement value of each reference signal in the first reference signal set; the measurement report includes first indication information, second indication information, a reference measurement value and a differential measurement value set of each transmission occasion; the second indication information indicates a target reference signal to which the reference measurement value belongs; the first indication information indicates an index of the target reference signal; and the differential measurement value set corresponding to any transmission occasion includes a difference value of part or all reference signals in the first reference signal set and the reference measurement value. Through the application, the efficiency of reporting the measurement result can be improved, and power consumption can be reduced.

The invention belongs to the technical field of power systems, and discloses a GIS equipment opening and closing stroke detection device and method. Comprising a box body and further comprises a sliding block, one side wall of the sliding block is fixedly connected with a sliding column, the sliding column is inserted into the side wall of the box body in a sliding mode, one end of the sliding column is provided with a transmission assembly, the transmission assembly is arranged on a main shaft of a brake, and the transmission assembly is used for converting rotary motion of the main shaft of the brake into linear motion of the sliding block. By arranging the piezoelectric sensor, in the switching-on process of the GIS equipment, the main shaft of the switch drives the sliding block to move through the transmission assembly, the sliding block presses the spring assembly, the reading of the piezoelectric sensor changes, the switching-on and switching-off stroke of the GIS equipment is detected in real time through the reading change of the piezoelectric sensor, and the first spring and the second spring are both compressed; the arrangement of the two springs provides differential measurement and eliminates stiffness drift caused by temperature change.