107results about "Current density measurements" patented technology

The invention relates to the technical field of bushing detection, and discloses a bushing insulation state detection method based on multi-parameter real-time monitoring. The method comprises the following steps: acquiring multi-dimensional monitoring data such as a partial discharge pulse sequence, dielectric loss angle tangent value fluctuation data and surface leakage current density distribution in a bushing operation environment in real time; carrying out insulation defect feature extraction on the data set, and generating an insulation defect distribution map containing a creeping discharge track, an internal air gap position mark and a carbonization channel density index; high-risk and potential defect areas are divided by adopting a dynamic threshold segmentation algorithm, boundary coordinates are determined, and an insulation state evaluation vector containing parameters such as a surface discharge intensity index and the like is constructed according to the boundary coordinates; and inputting the vector into a pre-trained insulation aging prediction model, and outputting a bushing residual insulation life estimated value and a defect development priority sequence. According to the method, all-around accurate monitoring and pre-judgment of the insulation state of the sleeve are achieved, and scientific support is provided for operation and maintenance decision making of the sleeve.

The invention discloses a method for testing short-circuit current of a solar cell. The method comprises the following steps: acquiring a first corresponding relation between the photoluminescence intensity of a standard cell under standard illumination intensity and the electroluminescence intensity of the standard cell under open-circuit voltage; providing a battery piece to be tested; irradiating partial areas of the first surface of the to-be-measured battery piece through a plurality of light sources with different wavelengths, and measuring to obtain bright area luminous intensity of a light receiving area and dark area luminous intensity of a non-light receiving area under the irradiation of the light sources with different wavelengths; according to the first corresponding relation and the luminous intensity of each bright area, obtaining basic electroluminescence intensity corresponding to the luminous intensity of each bright area; obtaining the equivalent external quantum efficiency under the irradiation of each wavelength light source according to the basic electroluminescence intensity and the dark space luminescence intensity corresponding to each wavelength light source; constructing a wavelength-equivalent external quantum efficiency curve; carrying out integral calculation on the wavelength-equivalent external quantum efficiency curve to obtain short-circuit current density, and calculating the short-circuit current of the battery piece to be measured according to the area of the first surface.

The invention discloses an electroplating production full-process monitoring system and method, and the method comprises the steps: monitoring a current density signal and plating solution temperature distribution data in an electroplating bath in real time, and generating a process coupling response value through density gradient analysis and hot spot migration track extraction; screening an abnormal process component by utilizing a process coupling response value, positioning a plating solution circulation transmission path and constructing a sensor network arrangement matrix; identifying a quality risk area through a big data processing technology, and extracting a coating thickness gradient field to determine a key monitoring node; adjusting equipment monitoring frequency according to the key monitoring nodes, forming a self-adaptive acquisition sequence and extracting a core monitoring set; performing energy consumption analysis by using the power change component, determining a monitoring period through load matching, and forming a monitoring convergence field; and a process control window is determined by using the monitoring convergence field and is converted into an intelligent monitoring instruction, so that comprehensive intelligent analysis and optimal management and control of production operation and maintenance of the electroplating bath are realized, and the quality stability and operation and maintenance efficiency of electroplating production are improved.

The invention discloses a flow battery performance analysis method based on current density distribution measurement, and relates to the technical field of batteries. Compared with a previous battery performance measurement technology, the problem that the data acquisition dimension is relatively narrow is solved; the sampling frequency lacks dynamic adaptability; different operation conditions and charge states are not considered; the problem of lack of comprehensive performance evaluation and prediction under multi-parameter fusion is solved; in combination with real-time environment parameters, block data and the like, data acquisition dimensions are rich and comprehensive; the key performance indexes of the battery are analyzed in real time, the sampling frequency is further adjusted according to the dynamic change conditions of the indexes in the charging and discharging process, the optimal operation conditions and the like of the flow battery are analyzed, and the subsequent optimization capability on the overall performance of the battery is improved; various technical means are fused, the performance of the battery is comprehensively evaluated from different levels, and the optimal operation mode and potential problems of the battery under different operation conditions can be mined based on the analysis and prediction result.

The invention provides a method for plasma bombardment energy distribution detection and life prediction of a silicon carbide part, and belongs to the technical field of semiconductor processing based on deep learning. The method comprises the following steps: firstly, arranging a magnetic probe array to obtain local electromagnetic parameters, and obtaining plasma luminescence characteristics by using optical imaging and spectrum acquisition equipment; preprocessing the acquired data to obtain multi-source fusion features; designing an energy distribution reconstruction framework based on a generative adversarial network, wherein a generator is used for deducing a three-dimensional energy distribution field of plasma; and inputting the three-dimensional energy distribution field time sequence characteristics into a bombardment dynamic characteristic modeling time sequence depth network, establishing a nonlinear mapping relation between energy distribution and material aging, further obtaining life prediction parameters, and finally obtaining the remaining service life of the silicon carbide part. According to the method, a complex degradation mechanism can be reflected more accurately, and the precision and robustness of life prediction are remarkably improved.

The invention relates to a battery contact resistance in-plane distribution estimation method and device, computer equipment and a storage medium. The method comprises the following steps: operating a to-be-detected battery under a stable operation condition, and collecting current density distribution of each region in the to-be-detected battery; each region is obtained by dividing according to a cathode flow field structure and an anode flow field structure of the to-be-detected battery; when the state of the to-be-detected battery meets a preset state condition, ohmic impedance distribution identification is carried out according to the current density of each region, ohmic impedance of each region is determined, and the preset state condition is matched with the stable operation condition; and determining the contact resistance of each region according to the ohmic impedance of each region. And the membrane is completely hydrated through high-humidity and high-current stable operation of the battery, so that the membrane impedances in different areas in the surface are approximately equal. And the accuracy of identifying the contact resistance of the to-be-detected battery is improved.

The invention relates to the technical field of NV color centers, and discloses an NV color center magnetic field and current measurement method and system. The method comprises the following steps: performing decomposition and noise reduction on the two to generate target three-dimensional data, and constructing a joint response equation by combining the resonant frequency offset and the fluorescence intensity change value of the target three-dimensional data; and finally, decoupling the equation to obtain a global magnetic field estimation value, and determining a current density distribution diagram according to the value and the vacuum magnetic conductivity. According to the method, the initial signal quality is improved through the quantum coherence enhanced pulse sequence, the influence of interference such as environmental thermal noise on the magnetic field signal is effectively weakened through decomposition noise reduction and joint response equation decoupling, and the magnetic field characteristics are accurately extracted, so that high-precision data support is provided for subsequent magnetic field analysis and current density distribution determination. The technical problem that in the prior art, interference such as environmental thermal noise exists generally, so that initially-collected magnetic field signals are mixed with a large amount of noise, and follow-up magnetic field and current analysis is seriously affected is solved.

The invention relates to the technical field of self-baking electrodes, in particular to an alternating-current variable-frequency self-baking electrode baking state prediction method for an iron alloy submerged arc furnace, which comprises the following steps: acquiring input parameters of a self-baking electrode, and simplifying an electromagnetic field and a heat transfer process related to the self-baking electrode into a two-dimensional axial symmetry state; constructing an electromagnetic field mathematical model, and obtaining expressions of the magnetic field intensity and the current density of the self-baking electrode; constructing a temperature field mathematical model of the self-baking electrode of the submerged arc furnace and an expression of electrode pressure release time; a finite volume method is utilized to discretize an electromagnetic field mathematical model and a temperature field mathematical model, and on the basis of input parameters and electromagnetic thermal boundary conditions, an implicit solution method which is good in convergence and stability and can achieve a large grid size is adopted to solve the magnetic field intensity, the current density, the temperature distribution and the electrode pressure release time of the self-baking electrode. The method can accurately and quickly predict the electrode pressure release time, and effectively reduces the roasting control cost of the self-roasting electrode of the submerged arc furnace.

The invention discloses an aluminum electrolysis cell furnace wall and current density calculation method and device, a storage medium and a product, and the method comprises the steps: building an electric-magnetic coupling model of a conductive region according to the structure parameters and process parameters of an aluminum electrolysis cell, and calculating the electromagnetic force distribution of an electrolyte and a molten aluminum region based on the electric-magnetic coupling model; the method comprises the following steps: constructing an anode bubble-electrolyte-molten aluminum three-phase flow coupling model according to structure parameters and process parameters of an aluminum electrolysis cell, and calculating bubble driving force distribution of an electrolyte area and a molten aluminum area based on the anode bubble-electrolyte-molten aluminum three-phase flow coupling model; constructing an aluminum electrolysis cell three-dimensional model according to the structure parameters and the process parameters of the aluminum electrolysis cell; electromagnetic force distribution and bubble driving force distribution are used as momentum sources, a full-cell electricity-heat-flow strong coupling model is constructed, and aluminum electrolysis cell furnace wall and current density distribution is calculated. Strong coupling calculation and analysis among the electric field, the thermal field, the flow field and the furnace wall can be achieved, and the method is closer to industrial practice.

The invention provides a simple measurement device for electron beam trajectory parameters of a traveling wave tube, belongs to the technical field of electron beam measurement, and solves the problems that an electron beam analyzer is used for measurement in the prior art, the use is relatively complex, the price is high, and the traveling wave tube is inconvenient to develop. The device comprises a base, a mounting cylinder is arranged on the base, a traveling wave tube is mounted on the mounting cylinder, corrugated pipes sleeve the outer side of the mounting cylinder at intervals, one end of each corrugated pipe is connected with the base, the other end of each corrugated pipe is connected with a sealing cover, a collector is arranged on the sealing cover, and the sealing cover is connected with an adjusting mechanism. The position of the collector is adjusted by the adjusting mechanism, so that the radial distance and the axial distance between the collector and the traveling wave tube are changed, the current density of different points in an electron beam is measured, and other track parameters are obtained; the measuring device is simple and convenient in structure and easy to operate, is an effective tool for developing a new traveling wave tube, and is also suitable for characteristic testing of various electron guns of other vacuum devices.

The invention discloses a semiconductor device parameter testing method and structure, and belongs to the field of semiconductor testing. The testing method comprises the steps that a testing structure is provided, the testing structure comprises a two-dimensional electron gas channel and a multi-end testing pattern, testing branches are arranged at the positions, close to the two ends, in the two-dimensional electron gas channel, and the two ends of the two-dimensional electron gas channel and the testing branches are connected with the testing ends of the multi-end testing pattern in a one-to-one correspondence mode; respectively connecting the test ends connected with the two ends of the two-dimensional electron gas channel with a bias voltage and the ground, and measuring the channel current and the voltage of the test ends connected with the test branches; and calculating one or more of the source end contact resistance, the drain end contact resistance, the channel square resistance and the current surface density of the two-dimensional electron gas channel according to the size parameters of the two-dimensional electron gas channel and the measured voltage and channel current. The method is more accurate in test result, richer in data dimension and high in test flexibility.

The invention discloses a high-frequency transformer litz wire loss prediction method, and relates to the technical field of circuits, and the method comprises the steps: collecting an electromagnetic physical quantity, a structural physical quantity and a thermal physical quantity of a high-frequency transformer, so as to generate a multi-physical-quantity original feature set; carrying out litz wire equivalent copper foil conversion based on the multi-physical-quantity original feature set to obtain litz wire equivalent structure parameters; based on the litz wire equivalent structure parameters, determining three-dimensional magnetic field distribution of the litz wire, and decomposing the three-dimensional magnetic field distribution into a magnetic field component parallel to the strand and a magnetic field component perpendicular to the strand in combination with the litz wire torsion angle so as to generate a magnetic field component representation result; on the basis of the equivalent structure parameters of the Litz wire and the corresponding current harmonic characteristics, calculating the unit length loss of the Litz wire according to the magnetic field component characterization result so as to determine a basic loss value; and superposing the harmonic loss values to the basic loss value through the mutual impedance equivalent circuit of the litz wire to obtain the predicted loss value of the litz wire, thereby improving the loss prediction precision.

The invention discloses an electrode frame performance test method based on current density distribution measurement, and the method comprises the following steps: S1, assembling a battery unit, a measurement unit and a display unit, and obtaining an electrode frame performance test system; s2, performing charge and discharge test on the flow battery in the battery unit, and acquiring and recording voltage signals at two ends of each resistor through a data acquisition card in the test unit; and S3, the display unit receives and analyzes the acquired voltage signal data in real time, and draws a real-time current density distribution cloud picture in the electrode frame. The method not only can monitor and record the current density distribution in the electrode frame in real time, but also can judge whether the design of the electrode frame is reasonable or not by evaluating the performance of the structure and the material of the electrode frame and analyzing the current distribution uniformity under different conditions through measurement results, and can identify weak areas possibly influencing the performance of the battery. And a specific guidance basis is provided for design and optimization of the electrode frame.

The invention provides a fuel cell test system and a test method. The fuel cell comprises a first current collector, a first runner plate, a membrane electrode, a second runner plate and a second current collector which are stacked, a first runner region and a second runner region are respectively arranged on the first runner plate and the second runner plate and are used for introducing a first gas and a second gas, so that the first gas and the second gas are subjected to electrochemical reaction through the membrane electrode; the current density detection plate is arranged on the side, away from the first flow channel plate, of the first current collector, a detection area is arranged on the current density detection plate, and the projection of the detection area on the membrane electrode can cover the projection of the first flow channel area and / or the second flow channel area on the membrane electrode; and the acquisition device is used for acquiring the current density of different areas on the first current collector through the current density detection plate. By using the test system, the current distribution on the current collector of the battery model is acquired, and the acquisition result can comprehensively represent the performance parameters of the battery, thereby providing guidance for the design of the battery.

The application provides a training method and device of a current density distribution identification model, the method comprising: inputting a plurality of sampling source points into the current density distribution identification model, and obtaining a loss function in the current density distribution identification model, which is constructed based on a current density distribution function and an electric field integral equation; wherein the loss function comprises a hyperbolic tangent function, a derivative of the hyperbolic tangent function and a product of the Green function; performing series expansion on the hyperbolic tangent function in the loss function, and extracting singular terms from the electric field integral equation in the series expanded loss function to obtain a plurality of singular integrals; performing inner integral calculation and outer integral calculation on each high-order singular integral in the singular integrals to determine the current density distribution function corresponding to the minimum value of the loss function on all sampling source points. The application can quickly solve the singular integrals comprising the hyperbolic tangent function, the derivative of the hyperbolic tangent function and the product of the Green function to obtain the current density distribution function.

The invention discloses an ultra-thin strip current detection device and method based on pulsed excitation magnetic field detection, and belongs to the technical field of metal material processing and detection. The device comprises a main control module, a magnetic induction matrix acquisition module and a transverse reciprocating module. The magnetic induction matrix acquisition module is used for acquiring space magnetic field signals excited by pulse current on the surface of the ultra-thin strip; the transverse reciprocating module drives the sensor array to do reciprocating motion in the width direction of the strip, and in combination with conveying in the rolling direction of the strip, a composite scanning track of transverse reciprocating and longitudinal rolling is formed, so that a detection blind area caused by physical intervals of sensors is filled up; and the main control module is used for coordinating motion control and data acquisition, processing and inverting the acquired magnetic field signal, and reconstructing a two-dimensional current density distribution image in the plane of the ultra-thin strip. According to the invention, non-contact, high-resolution and visual detection of pulse current distribution in the electroplastic rolling process is realized, and an accurate basis is provided for process optimization and quality control.

The invention relates to the technical field of gas meter controller testing, in particular to a wireless communication intelligent gas meter controller and a control method thereof. Comprising a microprocessor, an electrochemical corrosion monitoring module, a soil resistivity acquisition device, a stray current monitoring unit, a wireless communication unit, a metering unit and an anti-corrosion regulation and control unit, the signal output ends of the electrochemical corrosion monitoring module, the soil resistivity acquisition device and the stray current monitoring unit are respectively and electrically connected with the signal input end of the microprocessor; the control output end of the microprocessor is respectively and electrically connected with the control input ends of the wireless communication unit, the metering unit and the anti-corrosion regulation and control unit; the electrochemical corrosion monitoring module is used for collecting hydrogen sulfide concentration, relative humidity and environment temperature parameters, converting analog signals into digital signals and transmitting the digital signals to the microprocessor. The system can cope with the coupling influence of multiple environment factors in a cooperative mode.

The invention relates to the technical field of electric power testing, and discloses a current stability testing method and system for an energy storage cabinet, and the method comprises the steps: obtaining current distribution data, and generating a current distribution graph through the combination of a preset node distribution graph; performing current density analysis according to the current distribution map to obtain a current concentration area; acquiring temperature data of the current concentration area, and superposing the temperature data with the current distribution map to obtain a comprehensive distribution map; performing temperature anomaly detection according to the comprehensive distribution map to obtain an overheated point coordinate; performing heat conduction simulation according to the coordinates of the overheat point to obtain a temperature prediction result; and performing current distribution optimization according to the comprehensive distribution map and the temperature prediction result to obtain an optimized current scheme. The method has the following effect that the current stability of the energy storage cabinet can be improved.

The present invention relates to the field of current monitoring technology, and in particular to an online current monitoring device, a monitoring method and their application in electrolytic copper foil. The online current monitoring device includes an electrolytic cell and an anode plate arranged inside the electrolytic cell; also includes a cathode roller module, which is rotatably arranged in the middle of the electrolytic cell and located above the anode plate; a light emitting module, which is arranged above the cathode roller module, and its emitting end faces the outer wall of the cathode roller module; a light reflecting module, which is arranged above the cathode roller module and is used to reflect light emitted by the light emitting module; and a light receiving module, which is arranged above the cathode roller module and is used to receive light reflected by the light reflecting module. The present invention can monitor the current density of each area of ​​the cathode roller module in real time by arranging the light emitting module, the light reflecting module and the light receiving module. By detecting the landing point and intensity of the light, it can accurately determine whether the current density distribution of the cathode roller module is uniform.

A current sensing system comprises a sensor unit arranged in a sensing current path and configured to detect current density in the sensing current path, a switching unit configured to receive a control signal and, in response to receiving the control signal, to switch a bypass resistor in parallel with the sensor unit, thereby forming a controllable bypass current path.

The invention discloses a superconducting current density measurement method, a control system, a storage medium and electronic equipment, and the method comprises the steps: determining a corresponding relation between the superconducting current density of a to-be-measured sample and dynamic inductance, and connecting the to-be-measured sample with a resonant circuit; obtaining dynamic inductance, and determining resonant frequency according to the dynamic inductance; monitoring the resonant frequency, determining the change of the dynamic inductance according to the change of the resonant frequency, and obtaining the superconducting current density corresponding to the resonant frequency according to the corresponding relation; the measuring method designed by the invention is not limited by the volume of the sample to be measured, the change of the superconducting current density can be directly monitored by monitoring the change of the resonant frequency temperature or the magnetic field, the superconducting current density can be accurately measured on the mesoscale (micro-nano scale) sample, and the measurement accuracy is high. The problem of inaccurate measurement caused by weak signals in the prior art is solved.

A contactless current sensing system and method for high power density power electronics systems are provided. The contactless current sensing system is a two current sensor system in which two current sensors having substantially the same sensitivity are positioned on opposite sides of a current-carrying conductor.

The invention relates to the technical field of PEM electrolytic cell performance testing, and particularly discloses a PEM electrolytic cell performance testing system which comprises the steps that the maximum current density overestimation problem is recognized through a water flow velocity sensitivity test, and a dynamic working condition test matched with an actual operation scene is verified through dynamic mass transfer; determining the dynamic mass transfer limit and the dynamic mass transfer critical value of the gas diffusion layer, quantifying the aging attenuation rule of the dynamic mass transfer critical value of the gas diffusion layer based on historical data, and correcting the test deviation of the real-time aging of the unmatched gas diffusion layer through actual operation verification; the future parameter mismatch test is positioned and pre-corrected in advance through mismatch test prediction and parameter correction, the problem that the maximum current density is overestimated due to the fact that the dynamic mass transfer limitation and the aging influence of the gas diffusion layer are not considered in the existing static test is solved, dynamic adaptation of the aging state of the gas diffusion layer and the test parameters is achieved, and the test accuracy is improved. And the deviation between a test result and actual operation is reduced.

The invention discloses a partial discharge detection device, method and equipment for a subway cable, and belongs to the technical field of electric power facilities. The device comprises a current signal acquisition module used for acquiring a current signal through a high-frequency current transformer arranged on a cable grounding wire; the pulse current identification module is used for identifying whether a pulse current signal exists in the current signals or not; the feature extraction module is used for carrying out feature extraction on the pulse current signal under the condition that the pulse current signal exists in the current signal, so as to obtain a pulse current feature; and the partial discharge detection module is used for analyzing the pulse current characteristics to obtain a partial discharge detection result. According to the technical scheme, by identifying whether the pulse current signal exists in the current signal of the cable grounding wire and determining the partial discharge detection result according to the pulse current signal, efficient and accurate detection of the partial discharge condition of the subway cable can be realized, so that safe operation of the subway cable is guaranteed.

The application discloses a kind of in-pipe electrode head anode body consumption state real-time monitoring system, it is related to electrode wear monitoring technical field, the system includes data acquisition module, data processing module, modeling module, life prediction analysis module and risk early warning module;By arranging multiple micro-sensing nodes in electrode pipeline interior, current density distribution, potential gradient and electrode-medium interface sense resistance value are collected;After normalization processing, loss characteristic map is constructed, and loss mapping matrix is generated;Supervised learning is carried out using long short-term memory residual network, and real-time consumption state weight value is output;Combined with operating condition parameters, the remaining life of each region is predicted based on Bayesian dynamic model, and critical wear area is labeled;When life is lower than preset threshold and consumption acceleration exceeds set value, output anode head replacement early warning instruction;The application realizes high-precision, dynamic monitoring and intelligent early warning of electrode anode body wear state, with good real-time and adaptability.

A system and method for selective activation and deactivation of electrical brushes used in a dynamoelectric machine for current density optimization is disclosed. The approach includes using an arrangement of switches electrically connected to the electrical brushes to selectively activate and deactivate the brushes during the operation of the dynamoelectric machine. This entails opening and closing selective ones of the switches for a predetermined time period to adjust the average current density of the electrical current passing through the electrical brushes to be within a predetermined current density range while the dynamoelectric machine is operating.

This invention provides a method for diagnosing parameters of non-uniform plasmas based on the local microwave penetration effect. This method relates to the fields of electromagnetics and plasma diagnostics, and includes a combined diagnosis of the electron density distribution and collision frequency of a plasma profile. The method models the plasma to the left of the peak layer by layer and iteratively optimizes the distribution results. The method also uses the maximum reflection coefficient amplitude slope to derive the plasma electron density peak. For the plasma to the right of the peak, the method models multiple distribution models, determining the model using the attenuation coefficient. Furthermore, the method uses the maximum reflection coefficient amplitude to diagnose the collision frequency. This method addresses the problem of diagnosing parameters of non-uniform plasma profiles.

The application discloses a kind of measurement methods of interfacial exchange current density, belong to electrochemical test field.The method for realizing of the present application is: using self-built three-electrode single particle electrochemical test system to measure the electrochemical impedance spectroscopy of multiple micron scale particles, obtain the current density of multiple single crystal particles;X-ray diffraction technique is used to obtain material crystal structure information;Using high-resolution transmission electron microscopy to measure the crystal face type of any exposed surface of single particle;The three-dimensional reconstruction of single crystal particle is carried out to obtain the geometric information of particle;Through crystal structure information, the crystal face type information of exposed surface and the angle information between each exposed surface, the crystal face type of all exposed surfaces is calibrated;According to the crystal face type of all exposed surfaces of multiple particles, the area of corresponding exposed surface and the current density of particle, the exchange current density of different crystal faces of crystal material is calculated.The present application can be used for the measurement of micron scale crystal material crystal face exchange current density, quantitative analysis of the electrochemical activity of material.

An apparatus for obtaining ion energy distribution measurements in a plasma processing system comprising a substrate, an ion energy sensor and associated control circuitry disposed in the substrate, and a conductive enclosure disposed in the substrate and surrounding the ion energy sensor and control circuitry such that the substrate at least partially surrounds the conductive enclosure.

The present invention relates to a high-frequency driven high-speed diagnostic electrostatic probe system and a method thereof and, more specifically, provides a high-frequency driven high-speed diagnostic electrostatic probe system and a method thereof, wherein a high-speed diagnosis for the characteristics of plasma is enabled by using a fitting function without a high impedance choke filter after a plurality of pieces of current waveform data, which are measured by applying a high-frequency bias voltage to a probe while shifting the phase of same, are phase-retrieved and averaged and then processed in accordance with a preset methodology.