957results about "Electrical/magnetic thickness measurements" patented technology

The invention discloses a pulsed eddy current detection method and system for a thermal power pipeline with a coating layer, and relates to the technical field of pulsed eddy current nondestructive detection.The pulsed eddy current detection method comprises the steps that pulsed eddy current detection simulation and experiment are conducted under the condition of a three-dimensional simulation model and a test piece, and excitation current waveform, amplitude and frequency parameters are determined; an induced voltage signal is collected, peak values, time points and attenuation characteristics are extracted, the corresponding relation between the wall thickness, the coating layer thickness and the welding seam structure and detection signals is constructed, a parameterized database is constructed, and temperature correction is completed; and optimizing a sensor structure and a signal acquisition scheme according to a parameterized database, obtaining detection data in a pipeline operation state, completing two-dimensional imaging of wall thickness distribution and welding seam positioning, and forming detection information covering a straight pipe, an elbow and a welding seam area. According to the method, wall thickness detection and welding seam positioning of the thermal power pipeline under the conditions of a thick wall and a thick coating layer are achieved through the full-process design of test piece modeling, simulation experiment and imaging collection.

The invention discloses a quality detection method and system for vehicle safety belt production and a storage medium, and relates to the field of manufacturing quality control of automobile passive safety parts. The method aims at solving the problems that an existing detection means is weak in tiny defect recognition capacity, insufficient in defect evolution modeling and lack of intelligent feedback regulation and control. According to the method, multiple detection means such as medium-wave infrared thermal imaging, laser confocal microscopy, structured light three-dimensional reconstruction and capacitance sensing are fused, and multi-mode defect sensing of key parts such as a braid, an insertion area and an adhesive layer is achieved; deducing a defect evolution process and generating a high-credibility pseudo label by constructing a thermal-stress-rheology coupling finite element model; the graph neural network and the AI model are combined to complete defect type identification, risk quantification and grading, and automatic optimization of process parameters and production line control response are realized based on the quality grade, so that the detection precision, the response efficiency and the product yield are remarkably improved.

The invention discloses a metal flat plate thickness and conductivity eddy current measurement method and system. According to the method, an electromagnetic detection platform is built, and a coaxial excitation-receiving eddy current probe structure is designed. Establishing a coaxial eddy current detection analysis model, and deducing a dynamic calculation result of mutual inductance parameters of the sensor in a frequency sweeping mode; setting two PID (Proportion Integration Differentiation) controllers and initial control variables thereof, and inputting the control variables serving as a thickness value and a conductivity value into the analytical theoretical model to obtain a corresponding mutual inductance change result; calculating an instantaneous error term and an accumulative error term of the current iteration period in real time, and when the error exceeds a preset convergence threshold value, inputting the error into a PID controller and updating the two control quantities until the maximum iteration frequency is reached; otherwise, outputting a control variable value, wherein the two control variables output by the controller are the thickness and the conductivity of the metal plate respectively. According to the invention, the thickness and conductivity of the metal plate can be accurately and simultaneously measured.

The embodiment of the invention provides a coating layer wall thickness pulse eddy current detection method and system based on multiple eddy current rings, and the method comprises the steps: applying a square wave excitation signal to an excitation coil, and carrying out the induction in a structural member with a coating layer to generate eddy current; collecting a voltage signal generated by induction of an attenuation magnetic field generated by the eddy current by using a receiving coil, wherein the attenuation process of the voltage signal comprises three stages; identifying a power function interval of the second stage to determine the starting time of the third stage; taking the starting time of the third stage as a reference, and selecting a preset thickness quantitative time interval in the third stage; calculating a first-order derivative of the voltage signal to time under a single logarithmic coordinate system in the thickness quantitative time interval to obtain a slope; according to the quantitative relation between the slope and the wall thickness of the structural part with the coating layer, the wall thickness value of the structural part with the coating layer is obtained through calculation.

The invention belongs to the field of data control optimization, and provides a sediment thickness real-time calculation method, system and equipment based on dynamic electric dip angle feedback, which can collect the current value fed back by a sediment thickness probe by setting a plurality of continuous and equal time sampling windows, collect the current value set in each time sampling window, and calculate the sediment thickness according to the current value set. Respectively calculating a current signal inclination angle according to the current value set in each time sampling window; a dynamic time window is used to filter the current signal dip angle of each time sampling window to control the real-time calculation of the sediment thickness. The sediment thickness can be reliably and continuously obtained in real time and probe deflection and environment drifting can be automatically counteracted under the environments of mud, high pressure, deep holes and the like. The device and the method have remarkable progress in the aspects of drifting resistance, noise resistance, continuous measurement and equipment reliability, and can be widely applied to sediment thickness detection of deep piles, large-diameter cast-in-place piles and coastal high-salt projects.

The invention discloses a copper plating method for a superconducting strip. The method comprises the following steps: S1, carrying out initial electrochemical copper plating on a processed strip; s2, high-precision continuous thickness measuring equipment is adopted to test the thickness of the plating layer in the length direction and the width direction of the strip; s3, compensating the thickness error by adjusting the position of the shielding plate according to the thickness distribution data obtained by testing; and S4, the steps S2-S3 are repeated until the plating layer is accumulated to reach the target thickness. The thicknesses of the copper plating layers on the two sides of the superconducting tape are adjusted by adjusting the shielding plates, non-contact detection and dynamic adjustment of the thickness of the plating layer are achieved, and the precision of the thickness of the plating layer is improved.

The invention belongs to the technical field of laser detection, and particularly relates to touch screen flatness detection equipment which comprises a base and an L-shaped supporting frame fixedly arranged at the top of the base, and further comprises a moving mechanism arranged at the top of the L-shaped supporting frame, a first air cylinder is arranged at the bottom of the moving mechanism, and a laser detector is fixedly arranged at the moving end of the first air cylinder; and the annular positioning seat is fixedly arranged at the top of the base, and an annular auxiliary touch screen is detachably arranged at the top of the annular positioning seat. The to-be-detected touch screen is ensured to be horizontally placed through the annular positioning seat, and the annular auxiliary touch screen makes up the defect of an edge structure so as to avoid abnormity of a laser detection signal; the lifting mechanism is matched with the dust removal mechanism to clean dust on the surface and accurately control the height, the alignment degree detection mechanism and the lifting mechanism cooperatively adjust the alignment degree of the touch screen to be detected and the annular auxiliary touch screen, the problems that edge detection data of the touch screen is missing and accuracy is insufficient are effectively solved, and the accuracy and stability of flatness detection are improved.

The invention relates to the technical field of detection equipment, and provides a thickness detection device for disc friction plates, which comprises a machine table and a rack fixed on the machine table, a rotating mechanism is arranged on the machine table, and a plurality of annularly distributed disc friction plates are placed above the rotating mechanism. A plurality of clamps used for fixing disc type friction plates are arranged on the top of the rotating mechanism, and a first motor is fixed to the lower portion of the machine table. Under the driving of the driving mechanism, intermittent rotation of the rotating mechanism can be realized, when the placing disc is in a rotation switching angle, the detection probe is just in a neutral position and is kept at a fixed position on one side of the disc type friction plate, and when the placing disc is in an intermittent time period when rotation stops, the detection probe is just in a neutral position and is kept at a fixed position on one side of the disc type friction plate. Compared with the prior art, the detection probe just can carry out flat-scanning detection on the disc friction plate below and automatically reset, and compared with the prior art, the flat-scanning detection mode matched with the radian of the friction plate is adopted, so that the coverage range can be increased, and the detection capacity is improved.

The invention relates to the field of liquid film thickness measurement, and provides a surface liquid film thickness measurement method and device. The device comprises an annular fixer, a rotating motor, a stepping motor, a probe, a slide rail stabilizer and the like. And the annular fixer fixes the test tube through a bolt and adapts to different tube diameters. The rotating motor drives the annular rotator to rotate, so that the circumferential movement of the probe is realized; the electric horizontal guide rail drives the sliding block and the stepping motor to achieve axial movement of the probe, and three-dimensional accurate positioning of the probe is completed. The probe is in contact with the liquid film and the pipe wall to form a closed circuit, and the moving state of the probe is monitored through current changes. The device can realize automatic, precise and multi-point distribution measurement of the thickness of the liquid film on the surface of the pipeline, has the advantages of simple structure, convenience in operation, stability, reliability, high applicability and low cost, and is widely applicable to measurement and analysis of the thickness of the industrial liquid film.

The invention discloses an electromagnet electromagnetic ultrasonic thickness measurement method and system based on an anti-collision unmanned aerial vehicle, and relates to the field of nondestructive testing, and the method comprises the steps: obtaining the coordinates of a preset detection point, controlling the flight path of the unmanned aerial vehicle, and determining the safety position information of the unmanned aerial vehicle located near the preset detection point; the motion of the multi-degree-of-freedom mechanical arm is controlled through a servo motor and an encoder, contact impact is reduced through a buffer mechanism, and attitude information of the electromagnetic ultrasonic sensor unit aligned with the surface of the to-be-detected object is determined; the magnetic attraction force is adjusted in real time through a closed-loop feedback system, and a linear frequency modulation pulse is adopted as an excitation signal to obtain an echo signal containing acoustic-electromagnetic coupling interference; acoustic-electromagnetic coupling interference is corrected and processed in an auxiliary mode through a multi-mode signal separation algorithm and machine learning, and final thickness data is obtained; and transmitting the final thickness data to a cloud platform, and providing a data visualization interface and an alarm function on the cloud platform. According to the invention, accurate thickness detection and remote monitoring of a complex structure material can be realized.

The invention relates to a wall-climbing robot system for detecting a coating of a steel pipe truss structure and an application method, and the system comprises a self-adaptive magnetic adsorption mobile platform which can be adaptively and stably adsorbed on steel trusses with different pipe diameters to execute an inspection task; the robot platform is provided with an autonomous positioning navigation system composed of a laser radar, binocular vision and an airborne computer, and the position of the robot is positioned in the steel pipe truss without satellite signals through real-time mapping and a positioning algorithm of tight coupling of laser and vision. The front part of the robot is provided with an electrically foldable surrounding type array camera, so that full-surface coverage type shooting of a steel pipe component is realized, and real-time identification of coating apparent defects is executed in combination with an artificial intelligence disease identification algorithm in an airborne computer; and the lower part of the robot is provided with a telescopic elastic electromagnetic eddy current probe for detecting the thickness of the coating. The method has the advantages that the apparent diseases and the thicknesses of coatings of steel structures such as ceilings of high-speed rail stations and ceilings of large stadiums can be rapidly detected.

An eddy current sensor (100) and a method (200) for eddy current measurement are disclosed, wherein the eddy current sensor (100) comprises: a first coil (102) for generating a first alternating electromagnetic field; and a second coil (104) for generating a second alternating electromagnetic field, wherein the second coil (104) is arranged concentrically to the first coil (102).

The invention provides a hydro-generator shaft insulation multi-parameter monitoring method and system, and the method comprises the steps: employing a common excitation proportion method, introducing a high-frequency excitation current source through a grounding brush, loading a high-frequency voltage on the basis of a shaft voltage, respectively detecting an oil film voltage and an insulation pad voltage, and calculating a voltage amplitude ratio, analyzing oil film capacitance and insulation capacitance based on the high-frequency signal; a co-excitation polling method is adopted, high-frequency excitation current paths are sequentially switched through a polling device, high-frequency current flows through different impedance branches, high-frequency and low-frequency voltage signals are separated through a frequency-selecting filter, and oil film impedance and insulation impedance are analyzed; an independent excitation method is adopted, a high-frequency excitation source is independently introduced from a bearing bush, a frequency-selecting filter or an impedance converter is combined, independent measurement of oil film impedance and insulation impedance is achieved, and oil film thickness and insulation parameters are calculated. According to the invention, multi-parameter monitoring of bearing insulation can be realized.

The invention discloses a gradient functional coating hob abrasion monitoring system for hard rock tunneling. The gradient functional coating hob abrasion monitoring system adopts a three-layer gradient functional coating structure including a surface high-hardness abrasion-resistant layer, a middle tough buffer layer and a bottom strong combination transition layer. The method comprises the following steps of: forming continuous gradient grain size, porosity and hardness-toughness gradient distribution by atomic-scale diffusion, innovatively integrating an embedded sensing network, implanting a resistor array, an acoustic emission unit and a thermal resistance type sensor in a coating, and constructing a wear state evaluation model by combining a multi-modal data fusion algorithm. Dynamic adjustment and active protection of the rotating speed and the propelling pressure of the cutterhead are achieved through a three-stage progressive control strategy. Performance limitation and an off-line monitoring mode of a traditional coating are broken through, gradient function cooperation and intelligent sensing control are integrated, the service life of hard rock tunneling equipment under the complex working condition is remarkably prolonged, and the operation reliability of the hard rock tunneling equipment under the complex working condition is remarkably improved.

The invention discloses a capacitance method measuring device and method for the thickness of a lubricating oil film between mechanical friction pairs based on a dynamic correction model, and belongs to the technical field of electrical measurement. Wherein the point contact ball disc testing machine comprises a point contact friction pair formed by a conductive disc and a steel ball; the conductive disc is electrically isolated by arranging insulating rubber pads on the upper surface and the lower surface of the conductive disc, and the steel ball is electrically isolated by arranging an insulating ceramic ball bearing in a transmission mechanism where the servo motor is connected with the steel ball. The two independent servo motors respectively drive the steel ball and the conductive disc to rotate, so that test working conditions at different speeds can be realized. According to the invention, the capacitance distribution in the Hertz contact area can be effectively calculated, the problem of measurement errors caused by peripheral capacitance interference of the Hertz contact area in a traditional capacitance method is solved, and accurate measurement of the oil film thickness between common metal friction pairs in engineering is realized.

The invention discloses a PCB dielectric layer thickness measurement method, apparatus and device, and a medium. The method comprises the following steps: obtaining a first thickness value of a target dielectric layer measured based on a capacitance test method; wherein the target dielectric layer is a dielectric layer in the PCB to be detected; obtaining a second thickness value of the sample dielectric layer measured based on slice analysis; wherein the sample dielectric layer is a dielectric layer in a sample PCB, and the sample PCB is a PCB which has the same structure as a to-be-detected PCB and is manufactured based on the same process condition; according to the first thickness value and the second thickness value, obtaining a measurement thickness value of the target dielectric layer; wherein the measured thickness value is the average value of the first thickness value and the second thickness value, and the method has the advantages that the measurement precision is improved, and the non-destructive measurement of the to-be-detected PCB can be realized.

The invention relates to the technical field of pipeline monitoring, and discloses a pipeline wall thickness calculation method and device based on magnetic signal change, electronic equipment and a storage medium, and the method comprises the steps: arranging an external magnetic field around a pipeline, and obtaining the magnetic signal data of the pipeline; performing noise processing on the magnetic signal data to obtain second magnetic signal data; performing normalization processing on the second magnetic signal data to obtain third magnetic signal data; collecting external environment data to correct the third magnetic signal data; performing feature extraction on the corrected third magnetic signal data, and establishing a mathematical relationship model of the magnetic signal and the pipeline wall thickness by using a linear regression method; calculating the wall thickness of the pipeline; and performing trend analysis on the wall thickness of the pipeline based on the historical wall thickness data to obtain predicted wall thickness data, setting a wall thickness safety threshold according to the predicted wall thickness data, and triggering an alarm system if the specific wall thickness value of the current pipeline is lower than the wall thickness safety threshold. The problem that the pipeline wall thickness detection is not convenient and accurate enough in the prior art can be solved.

The invention provides a virtual measurement method and device, and belongs to the technical field of semiconductor manufacturing. The method comprises the steps that surface topography parameters of M1 wafers in a wafer set are measured, a first measurement result of the M1 wafers is obtained, the wafer set comprises N continuous wafers in the same crystal bar, and the M1 wafers are wafers distributed on the crystal bar at intervals in the N wafers; the first measurement result is input to a pre-trained virtual measurement model, a second measurement result of M2 wafers is obtained, and the M2 wafers are wafers except the M1 wafers in the N wafers; and combining the first measurement result and the second measurement result to obtain a measurement result of the wafer set. And the accuracy of the measurement result is improved while the productivity resources are released.

The invention discloses a wafer resistivity and surface metal film thickness detection method based on double coils, and the method comprises the steps: integrating a low-frequency inductance coil and a high-frequency inductance coil on a probe, detecting the wafer resistivity and the wafer surface metal film thickness in real time through the low-frequency inductance coil, and detecting an LOD value in real time through the high-frequency inductance coil. Correcting the measured resistivity of the wafer and the thickness of the metal film on the surface of the wafer according to the LOD value, namely, correcting the thickness of the metal film on the surface of the wafer according to the relationship between the resistivity of the wafer and the thickness of the metal film on the surface under different LOD values and the output voltage value of the low-frequency coil, and the resistivity value of the wafer to be detected and the thickness value of the metal film on the surface of the wafer corresponding to the LOD value detected by the current high-frequency coil in real time are obtained.

The invention discloses a method for real-time wear monitoring and wear loss calculation of a composite material bearing, which comprises the following steps: acquiring the change of a resistance value monitored by a lubrication state identification sensor in real time, identifying a wear state according to the change of the resistance value, and calculating the wear frequency according to the wear state; acquiring the change of the resistance value of the life prediction sensor monitored by the life prediction sensor in real time, establishing a curve model between the abrasion loss and the resistance value of the life prediction sensor, and calculating the average abrasion loss and the total abrasion loss of each start and stop according to the curve model and the resistance value change of the life prediction sensor; acquiring the thickness wear condition of the resistance layer of the end-of-life sensor collected by the end-of-life sensor, calculating the residual wear times of the whole life cycle corresponding to the residual wear loss according to the set end-of-life thickness, the average wear loss and the total wear loss, and predicting the residual service life of the bearing bush according to the residual wear times. The method can calculate the abrasion loss in real time, can monitor the residual service life of the bearing bush in real time, and is high in prediction accuracy.

The invention relates to the technical field of electromagnetic nondestructive testing, in particular to a pipeline thickness measuring method and system capable of resisting interference of multiple layers of heat preservation media, and the method comprises the following steps: carrying out filtering processing on pulse eddy current signals of pipelines with different thicknesses under different heat preservation media by using an EMD algorithm improved by a particle swarm algorithm; a pulse eddy current filtering signal is obtained; extracting a middle-term signal intercept characteristic value, a power spectral density peak value characteristic value and a magnetic flux characteristic value of the pulsed eddy current filtering signals of the pipelines with different thicknesses under different heat preservation media; carrying out linear compensation on the mid-term signal intercept characteristic value, the power spectral density peak value characteristic value and the magnetic flux characteristic value of the extracted pulsed eddy current signal; and establishing a multi-dimensional feature fusion pipeline thickness inversion model by using the feature values after linear compensation. Linear compensation is carried out on power spectrum density peak values, magnetic fluxes and medium-term signal intercept extracted under different heat preservation media, so that interference of different heat preservation media on thickness measurement is eliminated.

The invention belongs to the technical field of pulsed eddy current detection, and particularly discloses a co-excitation type pulsed eddy current thickness measurement and flaw detection composite sensor. The sensor comprises a shell, and the shell is internally provided with an excitation coil used for exciting a pulsed eddy current magnetic field in a measured object; the absolute receiving coil coaxially sleeves the peripheral surface of the excitation coil and is used for sensing the pulsed eddy current magnetic field and outputting a thickness measuring signal for reflecting the thickness change of the measured object; the differential receiving coil comprises two sub-coils which are respectively arranged at the two radial ends of the absolute receiving coil, and the dotted terminals of the two sub-coils are connected and jointly used for sensing a pulsed eddy current magnetic field and outputting defect signals for reflecting defects of a detected object. According to the sensor, thickness measurement and flaw detection can be carried out on a detected object at the same time, and the detection sensitivity is extremely high.

The invention provides an electrostatic chuck internal defect detection method and device, a terminal and a medium, the electrostatic chuck comprises a ceramic layer and a metal layer, the method comprises the following steps: carrying out point-by-point contact scanning on the surface of the ceramic layer through an eddy current probe, and collecting an impedance change value corresponding to each scanning point to obtain impedance change data; inputting impedance change data into the impedance thickness model, and calculating the ceramic layer thickness of each scanning point to obtain ceramic layer thickness data; and processing the thickness data of the ceramic layer, and determining an internal defect area of the electrostatic chuck. According to the method, eddy current is induced in the conductive material by utilizing the alternating magnetic field, efficient and contact type defect detection is realized by analyzing impedance change, online nondestructive detection of the internal defect and the film thickness of the electrostatic chuck is realized, and the bump defect is accurately identified.

The invention relates to the technical field of welding, in particular to a welding manipulator convenient to adjust. The clamping assembly is used for clamping a welding piece; the driving assembly comprises a welding manipulator, and the welding manipulator is driven to move above the driving assembly; and the detection assembly comprises a second detection block arranged above the welding piece and a first detection block arranged below the welding piece. The thickness change of a welded plate is dynamically detected through the contact wheel, physical deformation is converted into an electric signal (voltage change), the magneto-rheological fluid coupling is linked to automatically adjust the welding speed, welding is accelerated in a thin plate area to avoid burnthrough, welding is accelerated in a thick plate area to ensure the fusion depth, self-adaptive regulation and control in the welding process are achieved, and the welding quality is improved. According to the mechanism, the uniformity and stability of weld joints are remarkably improved, and the defect problem caused by uneven thickness in traditional welding is effectively solved.

The wine bottle thickness measuring instrument is composed of a main body structure and a magnetic field measuring unit, the magnetic field measuring unit comprises a magnetic field inductive sensor and a permanent magnet assembly which form a magnetic field distance measuring system, and an electric signal output by the magnetic field inductive sensor is in linear correlation with the magnetic field intensity of the environment where the magnetic field inductive sensor is located; the main control module is electrically connected with the magnetic field measurement unit, pre-stores a magnetic field intensity B and distance d calibration data set matched with the permanent magnet assembly, reads an electric signal output by the magnetic field induction sensor, converts the electric signal into an actual magnetic field intensity value, selects a reference data set based on the calibration data set, and sends the reference data set to the permanent magnet assembly; the distance between the magnetic field inductive sensor and the permanent magnet assembly is calculated through a preset algorithm, and the distance is the thickness of the bottle wall of the wine bottle. The invention provides a wine bottle thickness measuring instrument with high precision, portability and non-contact measurement, so as to promote the standardization process of the wine identification and collection industry.

The invention discloses a seat armrest height acquisition method and system based on a slide rheostat, and belongs to the technical field of height measurement. The slide rheostat is applied to the seat armrest, the slide rheostat comprises a resistor and a sliding block, the seat armrest comprises a supporting part and a lifting part, the resistor and the sliding block are arranged on the supporting part and the lifting part respectively, and the method comprises the steps that positive voltage and zero voltage are applied to the upper end and the lower end of the resistor respectively, and a first voltage value L1v of the position of the sliding block is obtained; switching the directions of the positive voltage and the zero voltage applied to the upper end and the lower end of the resistor to obtain a second voltage value L2v of the sliding block position; based on the first voltage value L1v, the second voltage value L2v and the length value L of the resistor, the position P of the sliding block in the length direction of the resistor is obtained; based on the position P of the sliding block in the length direction of the resistor, the height position parameter of the lifting part is obtained. The height of the armrest can be accurately measured, and the higher-precision adjustment requirement of a user is met.

The invention discloses a bearing ring size detection device and detection method. The detection device comprises an air cylinder, a workbench, a sliding plate, an electric rotating table, a lifting mechanism, a gantry frame, a sliding table, a sliding table guide rail, an electric rotating table motor, a lifting mechanism guide rail, a grating ruler assembly, a measuring mechanism and a PLC. The bearing ring size detection device has the beneficial effects that the functions of three different detection devices are integrated on one bearing ring size detection device, so that equipment required by bearing ring detection is saved, the occupied space scale and the manufacturing cost required by bearing ring detection are reduced, the time required by bearing ring detection is shortened, the detection efficiency is improved, and the detection cost is reduced. The detection device is simple and reasonable in structural design, high in reliability and suitable for popularization and application.

A surveying pole comprising a pole arrangement extending along a longitudinal axis, a target internally arranged in said pole arrangement, a top unit mounted on said pole arrangement extending along said axis, comprising a position device, an electronic distance measurement (EDM) unit configured to determine a distance to said target and arranged offset with respect to said axis such that at least a portion of a light path between said EDM unit and said target does not coincide with said axis within said top unit, and an optical arrangement adapted to redirect said light path such that it is parallel with said axis within said pole arrangement, and a processor configured to determine a length of the pole arrangement based on the distance determined by the EDM unit.

The invention relates to a substation grounding grid corrosion detection and residual life evaluation method and system. The method comprises the following steps: acquiring a measurement point of a substation grounding grid; calibrating the electrochemical workstation by using a standard impedance source; applying a sine alternating current signal in a preset wide frequency range by using the calibrated electrochemical workstation; selecting a preset number of frequency points, collecting impedance values of each measurement point at different frequency points, and calculating an average value of all the impedance values as an impedance value measurement result of the current measurement point; establishing a Randles equivalent circuit model of the measurement point, fitting the impedance value measurement result of the current measurement point and the impedance value calculation result of the Randles equivalent circuit model by using a nonlinear least square method to obtain an optimal fitting parameter, and calculating the corrosion rate of the transformer substation grounding grid; and measuring the thickness of the current transformer substation grounding grid by using a nondestructive testing technology to obtain the residual life of the transformer substation grounding grid.

The invention discloses a machine learning icing recognition system and method for a skymirror system, and relates to the technical field of measurement, and the method comprises the following steps: S1, transmitting an optical signal to an ice layer, and judging the type of the ice layer based on the features of the returned optical signal; s2, acquiring an ice layer capacitance value, and calculating the thickness of the ice layer according to the capacitance value; s3, acquiring an image containing a water body, a sensitive zone at the junction of the water and the ice layer and the ice layer, and calculating the thickness of the sensitive zone according to image features and optical signal features; s4, acquiring the signal-to-noise ratio of the capacitance measurement data, determining a first weight coefficient according to the signal-to-noise ratio, and determining a second weight coefficient according to the contrast ratio of the image; and S5, performing weighted fusion on the capacitance measurement thickness and the image thickness based on the first weight coefficient and the second weight coefficient to obtain the corrected ice layer thickness. According to the invention, through multi-sensor data fusion, weight dynamic distribution and construction of prediction modeling, the problems of ice type identification, thickness measurement and growth law prediction are solved.