112 results about "Wave modulation" patented technology

The invention discloses an electromagnetic field simulation method under the coupling action of tidal waves and sea waves. The method comprises the steps that input parameters of the tidal waves and the sea waves are set; configuring environmental parameters and geomagnetic conditions; superposing the tidal wave velocity field and the sea wave disturbance velocity field to form a total velocity field; the tidal wave part and the sea wave part are linearly coupled in time and space to obtain a tidal wave-sea wave coupling field evolved along with a tidal phase; in the tidal wave-sea wave coupling field, electromagnetic response calculation is executed on each frequency-direction sampling point; general field synthesis and modulation effect analysis: introducing a tidal wave modulation factor to clearly reflect amplitude periodic change and spectrum reconstruction characteristics of an electromagnetic field signal along with a tidal phase; and outputting a time sequence, an amplitude spectrum and a spatial distribution result of the comprehensive electromagnetic field. According to the method, the authenticity and applicability of sea wave induction electromagnetic field simulation can be improved, and a new technical means is provided for electromagnetic noise recognition, sea wave parameter inversion and complex ocean dynamics process research.

The invention discloses a modular programmable metasurface of a row-column cross addressing architecture, which comprises an array formed by a plurality of pixels, each pixel comprises a plurality of modulation units and corresponding addressing circuits, and each modulation unit is of a metal-vanadium dioxide / sapphire / metal stacked structure and is used for realizing nonvolatile electromagnetic wave modulation; according to the addressing circuit, a micro heater array is connected with a nonlinear selector in series, and pixel-level independent control is achieved through a row-column cross addressing architecture; the addressing circuit comprises a series connection structure of a micro heater array and a nonlinear selector, and the resistance of the nonlinear selector changes nonlinearly along with voltage so as to improve the selectivity of pixel addressing. The invention further discloses a preparation method of the modularized programmable metasurface. According to the invention, the array scale can be expanded through modular splicing, and the device has the characteristics of compact structure, high integration level and flexible operation.

The application provides a kind of ice constant temperature dynamic mechanical property testing device, belongs to ice detection technical field, including launch subassembly, impact lever, incident support, incident lever, sample support, transmission support, transmission lever, data acquisition module and data processing module, the end face of impact lever towards incident lever is equipped with several spaced convex structures, the end face of incident lever towards impact lever is equipped with shaping piece, shaping piece is used to extend the rising time of incident stress wave that incident lever transmits to ice sample, the end face of incident lever towards ice sample is equipped with wave modulation module, wave modulation module is used to realize the wave impedance continuous gradient matching of incident stress wave from incident lever to ice sample, data processing module corrects the data collected by data acquisition module to obtain final incident wave strain and final transmission wave strain, and calculates the strain rate, stress and strain of ice sample.The application scheme improves the accuracy of ice constant temperature dynamic mechanical property test results.

The invention belongs to the field of composite material preparation, and relates to a preparation method of a flexible vegetation-imitating green leaf camouflage material, which comprises the following steps: doping chrome green Cr2O3 particles in a polydimethylsiloxane (PDMS) matrix to form a bottom film with the appearance color similar to that of green vegetation, and then coating a layer of film doped with Au or Ag and other metal nanoparticles on the bottom film to obtain the flexible vegetation-imitating green leaf camouflage material. Therefore, the wave modulation method based on surface plasmon enhanced absorption is realized, the material can imitate the reflectivity of green vegetation in a near-infrared band, PDMS is taken as a matrix and doped with chrome green particles, so that the color of the film is similar to that of a green plant macroscopically, Ag nanorods doped in the upper PDMS coating can enable the chrome green coating to imitate a red edge effect, and the reflectivity of the green vegetation can be simulated in a near-infrared band. Vegetation is simulated in a near-infrared band. The two layers of films are compounded, so that the camouflage material and the vegetation green leaves have the same color and spectrum, and the preparation method and the material have very wide application prospects.

A Delta-sigma (delta-sigma) device comprises a transducer (2) and a delta-sigma modulator (3), where the transducer (2) comprises: a sensing stage (100) for detecting a property of an environment (106) and an interface stage (101), where the sensing stage (100) is configured to detect the property of the environment (106); and the delta-sigma modulator (3) comprises: an input stage, a feed-forward low-pass filtering stage (102), an analog-to-digital encoder (104), an unfiltered in-modulator feedback path and a low-pass filtered in-modulator feedback path; wherein the input stage is connected to the interface stage (101) and comprises two subtraction stages (113, 114) of the input stage for receiving an unfiltered in-modulator feedback signal (109) and a low-pass filtered in-modulator feedback signal (110) and subtracting the unfiltered in-modulator feedback signal (109) and the low-pass filtered in-modulator feedback signal (110) from the sum of the one or more input converted signals (108), to obtain a delta error signal (111); the analog-to-digital encoder (104) converts the filtered delta error signal into a digital output signal dout (t) (112); the feedback path in the unfiltered modulator converts the dout (t) (112) into a feedback signal (109) in the unfiltered modulator; the low-pass filtering modulator internal feedback path converts the dout (t) (112) into a low-pass filtering modulator internal feedback signal (110).

The invention discloses a precipitation enhancement system and method based on electroacoustic low-frequency sound waves of an unmanned aerial vehicle, and is applied to the technical field of sound wave precipitation enhancement. Comprising an unmanned aerial vehicle flying platform, an airborne power supply module and an electroacoustic low-frequency sound wave generation subsystem, the airborne power supply module supplies power to the electroacoustic low-frequency sound wave generation subsystem, the electroacoustic low-frequency sound wave generation subsystem converts electric energy into strong sound waves in a specific frequency band, cloud droplet collision, combination and growth are promoted, and finally rainfall is formed; the electro-acoustic low-frequency sound wave generation subsystem comprises an electro-acoustic conversion unit used for converting electric energy into low-frequency strong sound waves; the sound wave modulation unit is used for regulating and controlling sound wave parameters; and the damping integrated unit is used for isolating vibration generated when the electro-acoustic conversion unit works. The unmanned aerial vehicle is used as an aerial maneuvering platform, electric energy is efficiently converted into strong sound waves in a specific low-frequency band, the strong sound waves directly act on water vapor particles in a cloud layer, collision, merging and growth are promoted through sound wave vibration, and precipitation increasing operation is achieved.

A wireless transmit / receive unit, WTRU, can select a constellation from a set of constellations corresponding to a symbol configuration for indirect carrier modulation, ICM, based on at least one constellation performance efficacy indicator, each constellation performance efficacy indicator respectively corresponding to a constellation of the set of constellations, and use the selected constellation and symbol configuration to simultaneously harvest energy and transmit data.

The invention belongs to the technical field of power distribution network communication processing, and particularly relates to a multi-device converged communication processing method for power distribution network automation. Equipment sub-signals adopt single modulation and are distributed with different frequency bands, and a multi-channel transmission scheme is established by adopting a frequency division multiplexing carrier modulation method based on a power distribution network communication system; signal modulation processing based on a power distribution network transmission environment; and respectively performing transmission optimization on the data by using the sending end and the receiving end. On the basis of the existing transmission network, the information transmission efficiency and capability, especially the capability of multi-device joint communication processing, are further enhanced.

The invention relates to a superheterodyne transceiver system, which belongs to the technical field of millimeter wave and wireless radio frequency links, and comprises a transmitter and a receiver, the transmitter comprises a plurality of first chopping modulation modules used for modulating a plurality of paths of baseband signals to different intermediate frequency bands through a first chopping circuit to obtain a plurality of paths of different intermediate frequency signals; the first local oscillator source is used for generating a shared up-conversion local oscillator signal; the plurality of first frequency mixing modules are used for performing frequency mixing processing on the plurality of paths of intermediate frequency signals and the up-conversion local oscillator signals respectively so as to perform up-conversion on the intermediate frequency signals to an E wave band and obtain a plurality of paths of E wave band signals; the transmitting module is used for transmitting multiple paths of E-waveband signals; and the receiver is used for receiving the multiple paths of E-band signals and demodulating a target signal from the multiple paths of E-band signals. According to the invention, the demand on a local oscillator source is reduced, so that the complexity, power consumption and cost of the system are reduced.

The application belongs to the technical field of ocean exploration, and specifically discloses a seabed bottom type in-situ detection device and method. The device comprises an upper computer, a transmitter and a receiver. At the transmitter end, the application modulates selected initial identification information symbols into a low-frequency carrier frequency band in a multi-band linear frequency modulation manner to generate a low-frequency modulated wave, and then modulates the low-frequency modulated wave into a high-frequency carrier in an amplitude modulation manner to form a narrow underwater acoustic beam. At the receiver end, because different types of seabed have different self-demodulation capabilities and underwater sound dissipation characteristics at different bit positions of the identification information symbols, T-BOK demodulation is realized through low-frequency echo reception to obtain a three-state identification code, and the delay information of each bit of the three-state identification code is recorded. Through the three-state identification code demodulated by the low-frequency echo, the delay information of each bit of the three-state identification code, and a three-state identification code codebook generated in advance, the seabed bottom type and distribution characteristic parameters are obtained.

The application discloses a modulation and power balance method of a hybrid cascaded H-bridge inverter and an extended topology system, belongs to the technical field of power electronic converters, and core comprises the following steps: constructing a thirteen-level basic topology with a DC side voltage ratio of 1:1:2:2, which is cascaded by two low-voltage H-bridge units and two high-voltage H-bridge units; adopting a hybrid modulation strategy, the high-voltage unit works at a fundamental frequency by using a staircase wave modulation to reduce loss, and the low-voltage unit uses an improved carrier phase-shifted PWM modulation based on a reconstructed laminated triangular carrier to eliminate reverse circulating current and improve the equivalent switching frequency; the high-voltage unit driving signals are cyclically exchanged with 1 / 4 output voltage period as a rotation period, so that power self-balance is realized; and a general extended topology scheme is provided, which is cascaded by n high-voltage modules and k low-voltage modules, avoids level loss under the constraint of k≥m, and can use the modulation and power balance logic of the basic topology.

The invention discloses an ultra-parallel microwave photon Isin machine system based on wavelength division multiplexing and an optimization method, and belongs to the technical field of photon calculation and combination optimization. The Isin machine system comprises a multi-wavelength light source module, a microwave modulation and wavelength division multiplexing coding module, a nonlinear calculation and evolution module and a demultiplexing and dynamic feedback module, all the modules are optically and electrically connected to form a closed-loop system, and different optimization problems can be coded to independent wavelength channels to achieve parallel solving. The optimization method is applied to the Isin machine system, and closed-loop optimization is completed through the steps of coupling matrix mapping, microwave modulation loading, nonlinear evolution, dynamic feedback control and the like. The method supports synchronous processing of 1024 optimization problems, and energy consumption of a single problem is lt; the method is mainly applied to the fields of logistics scheduling, financial modeling, communication network optimization and the like, and an efficient physical calculation solution is provided for a large-scale combination optimization problem.

The application provides a multi-target user detection synchronization method, system and storage medium based on a sweep frequency spread spectrum carrier modulation technology. A transmitting end preferably constructs a Gold sequence as a spread spectrum code by using an m sequence, modulates the Gold sequence on a periodic linear sweep frequency carrier in a BPSK mode by using an S2C modulation mode, and forms a synchronization header signal with a sharp autocorrelation peak and a low cross-correlation side lobe. A receiving end preliminarily positions the synchronization header by correlation detection, and then performs a de-skew processing on the received signal, multiplies the received signal with a local linear frequency modulation reference signal, and performs a band pass filtering, so as to convert the wideband sweep frequency signal into a single frequency signal, and greatly reduce the processing complexity. On this basis, the coarse synchronization utilizes the correlation detection combined with the maximum likelihood method to preliminarily time in the time domain, and the fine synchronization finely adjusts according to the frequency characteristics of the de-skewed signal. The method can still realize the robust multi-target signal detection and high-precision positioning in a complex underwater acoustic multipath environment, and has good engineering practicability.

The invention discloses a light wave modulation method and equipment. According to an exemplary embodiment, the light wave modulation method comprises the following steps: determining a modulation parameter of a light wave according to target dispersion or determining the modulation parameter of the light wave according to a target spectrum; calculating modulation parameters of ultrasonic waves based on the modulation parameters of the light waves; generating ultrasonic waves, the ultrasonic waves having the modulation parameters calculated for the ultrasonic waves; and modulating light waves through the ultrasonic waves. According to the regulation and control scheme based on the acousto-optic crystal, dispersion control and spectrum control are integrated into a single device, dispersion and spectrum control functions can be achieved through flexible adjustment of ultrasonic parameters, complex light path adjustment is not needed, operation is easy and convenient, work is stable and reliable, the performance limitation of a traditional element is effectively broken through, and the application range is wide. Accurate control of dispersion and spectrum of the ultrashort pulse laser is realized, and a brand new technical path is provided for high-performance regulation and control of the ultrashort pulse laser.

The invention discloses a method and device for identifying a voltage flicker source in a power distribution network based on SVMD-HistGBT, and relates to the field of electric energy quality monitoring, voltage flicker is divided into sine wave modulation type flicker, rectangular wave modulation type flicker and inter-harmonic modulation type flicker according to causes of the voltage flicker, and for the three typical types, the voltage flicker source in the power distribution network is identified. The sampling voltage is split into narrow-band intrinsic mode functions through successive variational mode decomposition, and feature extraction is carried out; and then, constructing a histogram gradient boosting tree classifier to learn three types of flickers, and realizing identification of the voltage flicker source in the high-proportion photovoltaic access power distribution network according to the extracted characteristics of the sampling voltage. According to the invention, different types of flicker signals can be effectively decomposed, so that identification of different voltage flicker sources is completed.

The invention provides a non-uniform double-pulse modulation method based on a TCM. The non-uniform double-pulse modulation method comprises the steps that 1, a non-uniform double-pulse period modulation model is constructed; 2, carrying out radar echo modulation analysis; 3, analyzing a pulse compression result; and step 4, regulation and control effect analysis based on a CFAR detector. According to the method, the key parameter of the time delay factor is innovatively introduced, the modulation flexibility and unpredictability are greatly improved through the collaborative design of three degrees of freedom, and the problems of insufficient flexibility and the like existing in a radar target feature regulation and control method are solved. Compared with a regulation and control method based on TCM uniform monopulse period modulation, the generated harmonic peak amplitude distribution is diversified, screening of regular signals by a radar CFAR detector is effectively avoided, and the number of effective harmonic peaks passing detection is remarkably increased. According to the invention, precise suppression or enhancement of specific-order harmonics can be realized, and a technical approach is provided for implementing flexible and dynamic radar target feature regulation and control.

Embodiments disclosed herein relate to measuring thermal properties. At least one embodiment includes a method including heating a location of an object with an excitation laser beam, the excitation laser beam being a continuous-wave laser beam modulated by a square-wave modulation waveform. The method may also include measuring temperature at the location over time by measuring changes in one or more reflective properties at the location. Related apparatuses are also disclosed.

The application discloses a kind of high-power IGBT rectifying system and method, it is related to the technical field of IGBT rectification, including active front-end rectification main circuit is constructed;Integrated dc side hybrid harmonic modulation auxiliary circuit;Multiple delay signal elimination operation is carried out to the signal obtained by sampling, filter harmonic interference signal, the frequency and phase of grid fundamental voltage are locked by phase-locked loop;Establish the control structure of voltage outer loop and current inner loop, generate the instruction amplitude of net side active current and ideal sine current reference waveform, and real-time control IGBT in active front-end rectification main circuit;Actual input current of net side is analyzed in real time by fast fourier transform, and residual harmonic component is identified;Realize the feedback management of regenerative energy.The application proposes a kind of active front-end IGBT rectification method and system with high adaptability of fusion type, which can operate stably under grid voltage distortion conditions, and realize deep harmonic suppression and high efficient energy bidirectional flow.

The invention provides a device capable of flexibly adjusting operation impulse and lightning impulse and a test method thereof, and relates to the technical field of high-voltage test, the device comprises an integrated structure with a sealed shell, a switching device, a two-stage wave modulation resistor, a discharge sphere gap, a multi-stage charging capacitor, a protective resistor and a rectifying device are arranged in the device, and an operation interface and a grading ring are arranged outside the device; the switching device controls the interlocking switching of the two-stage wave modulation resistors through the linked switch, and meets the requirements of lightning waves and operation waves in waveform. The test method comprises the steps of preparation, lightning impulse test, waveform switching, operation impulse test and ending, electric / manual switching is supported, and waveforms are automatically recorded. Based on the principle of parallel charging and series discharging of the impulse voltage generator, the problem that a traditional device needs to disassemble a shell and replace a resistor and consumes long time is solved, the switching time is shortened to the minute level, the test efficiency and safety are improved, the cost is reduced, and the device is suitable for testing of multi-voltage-level equipment.

The application discloses a kind of asymmetric laser interferometer type long-distance detection demodulation system and disturbance positioning method, including two lasers, Mach-Zehnder fiber interferometer, data acquisition card and industrial computer, two lasers provide the narrow linewidth light source of different central wavelength;Two light sources enter Mach-Zehnder fiber interferometer in clockwise and counterclockwise direction respectively, two signal lights share the same sensing fiber link when detecting;A phase modulator introduces high-frequency carrier signal on a sensing fiber, and the corresponding sensing light signal is modulated with high-frequency carrier;Subsequently two sensing interference light signals enter industrial computer after erbium-doped fiber amplifier, dense wave division multiplexer, photodetector, data acquisition card, two interference sensing light signals are demodulated into phase information introduced by disturbance event by corresponding improved phase generation carrier algorithm respectively, and the specific position information of disturbance event acting on fiber link is analyzed by cross-correlation time delay estimation theory.

The invention relates to a terahertz transmission wave modulator based on multilayer microstructure heterogeneous integration. The terahertz transmission wave modulator comprises a metal radiation layer, a substrate material, a metal ground layer, an insulating material, a direct current wiring layer, a resin material and a metal receiving layer which are sequentially arranged from top to bottom, the metal radiation layer comprises two diodes; when a terahertz incident wave of which the electric field direction is parallel to the transverse central axis of the metal receiving layer enters the metal receiving layer, a direct current bias voltage signal generated by the direct current wiring layer is transmitted to the two diodes of the metal radiation layer so as to control the conduction state switching of the two diodes; and the amplitude and phase of the terahertz transmission wave emitted by the metal radiation layer are subjected to 1-bit modulation. The terahertz modulator is diversified in regulation and control mode and excellent in performance, can play an important role in terahertz application fields such as tracking and pointing communication, radar perception and object imaging, and has a wide application prospect.

This invention discloses a noise suppression circuit for a quartz vibrating beam accelerometer. It employs a chopper-AGC closed-loop oscillation circuit to achieve stable driving of the quartz vibrating beam. The circuit includes a chopper amplifier, an AGC automatic control gain module, and a follower amplifier. The electrical signal generated during beam vibration is amplified by the chopper amplifier and low-frequency noise is filtered out, resulting in a noise-reduced signal. This noise-reduced signal is then stabilized by the AGC automatic control gain module and amplified and phase-compensated by the follower amplifier before being fed back to the quartz vibrating beam accelerometer head, forming a stable closed-loop drive. This invention uses chopper modulation technology to modulate the noise signal and input signal to different frequency bands, and uses filtering to separate the noise signal and input signal. This method effectively improves the zero-bias stability and noise performance of the QVBA system.

An electromagnetic wave modulation structure includes a liquid crystal cell. The liquid crystal box comprises a plurality of modulation units. Each modulation unit comprises a first conductive pattern, a second conductive pattern and a liquid crystal layer. The first conductive pattern is configured on the first surface of the first substrate, wherein the first conductive pattern comprises a plurality of phase shift sheets which are separated and arranged along a direction, and a serial connection wire for connecting the phase shift sheets in series. The second conductive pattern is disposed on the second surface of the second substrate, wherein the first surface faces the second surface. The second conductive pattern includes dipoles corresponding to the phase shift sheets. The liquid crystal layer is disposed between the first conductive pattern and the second conductive pattern. The serial leads of the modulation units are electrically connected with a common lead.

A charger and control method, comprising: a transformer (240); at least one primary side switch tube (231) for chopping modulation of the voltage input into the transformer; a first control unit (211); a second control unit (212) for generating feedback information based on voltage and / or current information output from the charger output end; a first micro cell (221) connected with the first control unit (211) and the second control unit (212) respectively, for transmitting the feedback information to the first control unit (211); the first control unit (211) is used for outputting a first control signal according to the feedback information, to control the conduction or turn-off of the at least one primary side switch tube (231). The charger has fast driving speed, and the dead time can be accurately controlled; meanwhile, the transmission of the parasitic capacitance generated by the first switch tube can also be isolated. Since the first micro cell (221) is used for isolated communication, fast bidirectional communication can be realized, so that the rapidity, flexibility and safety of communication can be improved.

The invention provides a time-resolved fluorescence measurement method and system based on double-channel chopping modulation. The method comprises the following steps: respectively carrying out first chopping modulation and second chopping modulation on a first beam and a second beam of femtosecond pulse obtained by splitting source femtosecond pulse laser to obtain fluorescence excitation light carrying a first modulation frequency and gate pulse carrying a second modulation frequency, and exciting a sample to be detected by the fluorescence excitation light to radiate fluorescence as fluorescence seed light; after optical parametric amplification is carried out on the fluorescent seed light based on gate pulses, coupled fluorescence signals of amplified fluorescence, steady-state fluorescence and parametric fluorescence are collected, and Fourier transform is carried out according to fluorescence intensity information of the coupled fluorescence signals to obtain frequency spectrums at different wavelengths; wherein the sum frequency and the difference frequency of the first modulation frequency and the second modulation frequency in the frequency spectrum correspond to transient fluorescence, so that a transient fluorescence signal and a steady-state fluorescence background are separated in a frequency domain, and steady-state fluorescence background leakage in optical parametric fluorescence amplification measurement is efficiently inhibited.

The application provides a short wave communication equipment practical training platform, which comprises a base and a radio module, a switching control module, a short wave modem and a signal switching module arranged on the base; the switching control module is used for receiving signals of the radio module and transmitting the signals to the short wave modem or receiving signals of the short wave modem and transmitting the signals to the radio module; the short wave modem is used for receiving signals of the switching control module and transmitting the signals to the signal switching box or receiving signals of the signal switching box and transmitting the signals to the switching control module; the signal switching box is used for being connected with one of a vehicle-mounted terminal and a fax machine, so as to transmit digital signals to the connected one or receive signals of the connected one and transmit the signals to the short wave modem; the vehicle-mounted terminal is used for processing received signals and displaying; and the fax machine is used for identifying and printing received data. The application aims to provide a short wave communication equipment practical training platform which can be simultaneously applied to various communication devices.

An electromagnetic wave modulation module includes: an input terminal to which an electric signal of a specific frequency is input; a metal pattern that modulates an electromagnetic wave generated by the input electric signal of the specific frequency into a longitudinal wave; and an output terminal that outputs an electric signal that generates a longitudinal wave modulated and adjusted by the metal pattern. An electromagnetic wave modulation module capable of generating a longitudinal wave with a simple configuration is provided by using an electric signal oscillator manufactured with a semiconductor chip

The present application relates to the technical field of optical fiber large current sensor, and discloses a device and method for improving the pulse measurement accuracy of an optical fiber large current sensor.The device comprises a modulation signal generating unit, a step response storage unit, a pulse current storage unit and a convolution decoupling unit.For the problem of pulse measurement waveform distortion of a closed-loop optical fiber sensor, based on the convolution characteristics of a linear system and the non-reciprocal phase modulation technology, a step wave modulation signal is generated by the modulation signal generating unit to obtain the unit impulse response of the sensor, and the convolution decoupling unit is used to correct the pulse measurement result.The device does not need to rely on a large amplitude step current source, retains the original advantages of the optical fiber sensor, significantly improves the pulse current measurement accuracy, simplifies the process, and the result is reliable, and is suitable for pulse large current measurement scenes such as electrical equipment detection.

The invention relates to the technical field of sensing circuits, and provides a high-performance front-end instrumentation amplifier circuit and a resistive sensing circuit, the high-performance front-end instrumentation amplifier circuit comprises a differential amplifier, a chopping modulation circuit, a ripple reduction loop and a pre-charging loop; the input end of the differential amplifier is connected to the resistive sensor, and the differential amplifier amplifies the input signal; the chopping modulation circuit is connected to the input end and the output end of the differential amplifier and is used for modulating and demodulating the input signal and the output signal; the ripple reduction loop is bridged between the chopping modulation circuit and the input end of the differential amplifier and is used for reducing output ripples caused by chopping modulation; and the pre-charging loop is bridged at the input end of the differential amplifier and is used for improving the input impedance. According to the technical scheme, flicker noise and direct current offset are effectively reduced, the influence of output ripples brought by chopping modulation is reduced, input impedance is improved, and completeness and effectiveness of signal acquisition are guaranteed.

The invention discloses a handheld pressing plate direct-current voltage non-contact measuring device and a measuring method, and belongs to the technical field of power equipment detection. The device comprises an electric field induction modulation module and a main control board. And the modulation module drives a rotary modulation disc with a hollow structure to rotate through a driving motor, performs periodic chopping modulation on an electrostatic field coupled with the fixed induction electrode, and converts the electrostatic field into an alternating signal. The main control board carries out narrowband filtering and coherent demodulation on the signal, and then calculates and displays the DC voltage to ground of the tested pressure plate. According to the invention, complete electrical isolation with a protection loop is realized, and safety risks such as short circuit are avoided; power frequency interference is effectively suppressed through dynamic modulation, and the measurement precision is improved; the device is only provided with a single power switch, operation is extremely simple, single-person rapid operation and state intelligent judgment are supported, and the operation and maintenance safety and efficiency of the transformer substation are remarkably improved.