72results about How to "Accurate online detection" patented technology

The invention discloses a method for detecting a grid fault online under the condition of a limited number of PMUs based on the least square method. According to the method, the area disperse policy decision structure is adopted, and the wide area protection information of a home substation and an adjacent substation is collected through RDS; when it is found that protective action is carried out on a circuit, the online detection process of the circuit and an adjacent circuit is started; the current and voltage measurement values of the related PMUs are collected, the current and voltage estimated values of each node are worked out, the current residual value of each circuit is obtained, two suspected circuits are obtained through ranking and searching; for the two suspected circuits, according to the topological link relation between the two suspected circuits, criteria of a fault of a single circuit and combination faults of two adjacent circuits and the like are established; according to three groups of PMU measurement values, the positions of three groups of fault points of each suspected circuit are worked out, fault criteria are established, and then a faulty element is judged and detected. By the adoption of the method, the three fault conditions including the fault of a single circuit, combination faults of adjacent circuits and dual faults of non-adjacent circuits can be distinguished, and the situation that an oversized communication load is added to the SDH of a wide area communication network is avoided.

The invention discloses a mobile phone curved glass typical defect online detection device and method. The online detection device comprises a work-piece transmission device, wherein the work-piece transmission device comprises a transmission guide rail, a plurality of transparent objective tables, a motion control card and a motor, and a rotating table; a plane part detection device, a curve edgedetection device and a R angle part detection device for forming three stations are orderly arranged along a transmission direction of the work-piece transmission device; the online detection methodperforms previous training learning on the background and scratch, burning, edge breakage, pit and like typical defect sample images through a convolutional neural network, and original images collected at three stations are divided into multiple sub-images consistent with the size of the training sample, the segmented sub-images are quickly identified, thereby judging whether the original imageshave defects or judging the defect variety. The scratch, burning, edge breakage, pit and like typical defect sample images can be online detected in real time, and the detection device has the features of being fast, efficient, precise and stable.

The invention provides a detection device for surface-shape errors of a solar trench type curved surface reflector, relating to the field of mirror surface detection, which solves the problems that the when the surface-shape errors of the trench type curved surface reflector are detected by the conventional detection device, the detection process is complicated and time-consuming and is not suitable for rapid and online detection, and the subsequent image processing is complicated. The device comprises a light source device, a self-calibration device and an image acquisition and processing device, wherein the light source device comprises a laser, a beam expander and a beam splitter group; light beams emitted from the laser are expanded by the beam expander, are split by the beam splitter group and are reflected; a test light beam split by the beam splitter group is projected on the curved surface reflector to be detected; a self-calibration light beam reflected by the beam splitter group is transmitted into the self-calibration device; the self-calibration device is used for calibrating the parallel degree of the test light beam projected to the curved surface reflector to be detected; and the image acquisition and processing device is used receiving light spot information reflected by the curved surface reflector to be detected and determining the surface-shape errors of the curved surface reflector to be detected. The detection device is easy to operate and has low cost.

The invention discloses a field detection system for detecting the partial discharge of a cable and a joint, which comprises a hardware device and a software system. The hardware device comprises a broadband differential current sensor, a signal conditioning module and a data acquisition card. The broadband differential current sensor consists of a magnetic core, a Rogowski coil, a filtering and sampling unit and an electromagnetic shielding box. The signal conditioning module comprises a trigger signal circuit and an amplifier. The software system is labVIEW software in a virtual instrument technology. Signals are acquired from both ends of the cable and the joint by the broadband differential current sensor; after passing through the sensor, the signals enter the signal conditioning modules to be conditioned and amplified and then are sent into the data acquisition card so that analog signals are converted into digital signals; and the digital signals are sent into an internal memory of a computer to be subjected to anti-interference treatment in real time by a PCI (Peripheral Component Interconnect) bus; data subjected to interference removal is written into a database; and after repeated acquisition, the data is extracted from the database to carry out spectra analysis and data report so as to know partial discharge information of the cable and the joint and judge whether the partial discharge hidden danger exists or not.

The invention provides an online detection method and an online detection system for a running state of GIS (gas insulated switchgear) equipment. The method comprises the following steps of firstly acquiring a characteristic value and a benchmark characteristic value of the running state of the GIS equipment as well as a weight coefficient corresponding to the characteristic value, then carrying out the weight-contained threshold value analysis, the weight-contained trend analysis and the weight-contained statistics analysis for the running state of the GIS equipment, and finally determining the running state of the GIS equipment according to the three analysis results. According to the online detection method for the running state of the GIS equipment, comprehensive online detection for the GIS equipment is carried out respectively on the aspect of the time and the aspect of the space, so that not only can the current running state of the GIS equipment be comprehensively and accurately detected, but also the trend of the running state of the GIS equipment can be detected, and the potential fault in the running process of the GIS equipment can be discovered to some extent.

The invention relates to the technical field of industrial automatic measurement, in particular to a cement raw material quality online laser detection device and method. By the adoption of the device and method, the technical problems that quantitative analysis of cement raw material elements is not accurate and real-time detection can not be achieved currently are solved; online detection of the compound constituents and ratio value of a cement raw material in a delivery pipe in an industrial field can be conducted quickly and accurately in real time, influences caused by flow change of a cement air-powder column to be measured are avoided through the cooperation of a continuous laser device and a pulse laser device, and the accuracy of detection results is improved greatly; power stability of lasers emitted by the pulse laser device is effectively guaranteed through a laser powder feedback stabilizing device. The whole device is ingenious in design, detection results are accurate and reliable, and production quality of cement products can be effectively guaranteed.

The invention discloses a method and a device for testing the parameters of a metal pipe fitting with electric eddy under the eccentric state of a probe; and the device mainly comprises a signal generator, a power amplifier, an electric eddy probe, a signal conditioning circuit, an acquisition card and a computer data processing system. The device outputs sine wave with the signal generator, and the sine wave is amplified by the power amplifier and drives the electric eddy probe. A signal output by the electric eddy probe enters the computer data processing system after being conditioned by the signal conditioning circuit and acquired by the acquisition card. The computer data processing system preprocesses the acquired signal and sets an initial parameter value to be tested; the simulation result of a probe impedance theory model is compared with an experimental result; an estimated metal pipe fitting parameter is optimized again and again according to the deviation of the simulation result and the experimental result, until the deviation meets relevant requirements; and a final estimated parameter value is output and displayed as a test result. According to the method and the device, no coupler or precise centering device is needed, and a plurality of parameters of the metal pipe fitting can be precisely measured on line under the eccentric state of the probe.

The invention provides online detection equipment for the surface roughness of a cold-rolled strip steel and a regressive and smooth adaptive filtering method thereof. The corresponding equipment is used for detection, noise-reduction pretreatment is conducted on a surface roughness online-detection initial parameter through robust locally-weighted regression, a quadratic weighing function is established, and a weight is updated according to the relative positions between historical data and current data and the residual between a smoothed value and the actual value; and when the change of adjacent data is beyond a set threshold value, the width of a smooth window is decreased automatically, adaptive variable-step-length regressive and smooth filtering of online detection data of the roughness is achieved, and the detection precision of the surface roughness of the cold-rolled strip steel is improved. By adoption of the online detection equipment for the surface roughness of the cold-rolled strip steel and the regressive and smooth adaptive filtering method thereof, accurate and rapid online detection of the surface roughness of the strip steel can be achieved, the detection precision of the surface roughness of the cold-rolled strip steel is greatly improved, the offline detection technique can be replaced by the online detection technique easily, and the product efficiency and quality are improved.

The invention provides a method for rapidly determining volatile fatty acid (VFA) concentration in an anaerobic reactor. According to the invention, according to charge balance and final-initial volumes of a solution requiring detection when two different pH points are established, the relationship between VFA and pH is calculated; and through an acid titration method, VFA concentration of the solution requiring detection can be calculated. The invention provides a method for rapidly determining volatile fatty acid (VFA) concentration in the anaerobic reactor. The method is fast, stable, accurate, simple, and the like. With the method, defects such as rough method and poor accuracy of a colorimetric method and a distillation method are solved, and defects of high cost and complicated operation of a chromatographic method are avoided. With the method, VFA rapid and precise on-line detection can be realized.

The invention relates to a quality control method and equipment for traditional Chinese medicine decoction piece processing, and belongs to the technical field of traditional Chinese medicine decoction piece processing. The equipment comprises a processing tank and a circulating pipeline which is arranged outside the processing tank and connected with the upper end and the lower end of the processing tank, a feeding hopper and a liquid outlet pipe are connected to the processing tank, a circulating pump and a detection pool which are communicated are installed on a circulating pipeline, the circulating pump is communicated with the processing tank through a first liquid outlet valve, a detection probe is installed in the detection pool, and the detection probe is in communication connection with an optical spectrum analyser. The quality control method for traditional Chinese medicine decoction piece processing comprises the steps that traditional Chinese medicinal materials are added into the processing tank for processing traditional Chinese medicine decoction pieces, water is added, heating is conducted, and processing is conducted; when the processing temperature reaches a process setting value, the content of toxic substances in a processing solution and the content of hydrolysis products are detected online; when the processing conditions are met, processing is finished, the content of index components in the processing solution can be accurately detected online, and fast judgment of a processing end point is achieved.

The invention discloses a high-speed wire mill on-line accurate centering system and method. The system comprises a rack continuous rolling unit, and further comprises a laser device, an industrial camera, a data processing module and a display module, the laser device is arranged at the outlet position of the rack continuous rolling unit, the industrial camera is arranged at the inlet position ofthe rack continuous rolling unit, laser emitted from the interior of the laser device sequentially penetrates through all rack passes of the rack continuous rolling unit to reach the interior of a lens of the industrial camera, the industrial camera is used for capturing laser contour image information and contour image information of all the rack passes and sending the information to the data processing module, the data processing module is used for calculating off-center data of all racks according to the positions of laser spots and the conditions of all the rack passes and sending the data to the display module, and the display module is used for displaying the off-center data of all the racks in real time. According to the system and the method, the off-center numerical values of allthe racks can be given according to the recognition algorithm, the equipment centering basis can be accurately provided, and the rolling line centering precision and the automation level are improved.

An on-line fertilizer quality detection device based on a near infrared spectrum technology comprises a sample conveying belt located on a fertilizer production field, optic probes, a detection and control unit and a microprocessor, wherein a fertilizer sample is conveyed by the sample conveying belt, and the optic probes are mounted above the sample conveying belt, transmit acquired spectra to the detection and control unit for light splitting and photoelectric conversion, and then transmit to the microprocessor for modeling and quantitative analysis. The detection device further comprises V-shaped baffles assembled at the front ends of the lower parts of the optic probes, and the V-shaped baffles and the lower sides of the optic probes are inserted into the fertilizer sample when the fertilizer sample is conveyed. The device has the advantages that the on-line detection device is provided by applying the near infrared reflection spectrum analysis technology to fertilizer quality analysis research, can detect active ingredients containing hydrogenous groups H-X in a fertilizer on line, detect the fertilizer sample on the conveying belt precisely on line and has the advantages of high speed, no destruction, no pollution, convenience in operation and the like.

The present invention relates to a thick-film laser trimming method and trimming system based on nano-silver paste. The method prepares nano-silver paste suitable for tuning fork gyro characteristics through a new type of formula, and utilizes screen printing thick-film manufacturing technology to pre-process Deposit nano-silver paste masses at the end of the fork arm of the tuning fork, and use laser trimming technology to selectively remove the sintered nano-silver paste at the end of the tuning fork. Efficient and accurate on-line detection of the vibration form and frequency interval of the base, and the fast and accurate adjustment of the mechanical coupling error and frequency of the tuning fork gyroscope. This method combines nano-slurry production technology, micro-machining Combining with mature screen printing technology, the design method is reasonable and feasible, and the purpose of further improving the precision of the tuning fork gyroscope and perfecting the performance index of the gyroscope is achieved.

The invention provides an online coal quality identification device and an online coal quality identification method. The device comprises a full-spectrum photoelectric probe, a field control box, a data acquisition and processing unit, a master control cabinet and the like, wherein the master control cabinet is connected with the field control box through a control cable, and is connected with the full-spectrum photoelectric probe through a special connection line; the probe is arranged at the same position as a field flame detection probe; a full-spectrum photoelectric sensor is arranged in the full-spectrum photoelectric probe; and flame characteristics are converted into photoelectric signals, and then the photoelectric signals are sent to an acquisition device, amplified, filtered, sent to a spectrum analysis and modeling software unit and then adaptively processed by a neutral network to obtain coal quality. The whole set of device is simple and convenient to arrange, has no influence to the external environment, particularly to the security of the device, and continuously enriches coal quality data by fired coal quality self-learning to realize the accurate online detection of the coal quality.

The invention relates to a Beidou navigation and positioning based parking and vehicle locating system, which comprises a parking space management system, an IC card and an intelligent mobile terminal, and is characterized in that each parking space of a parking lot is provided with an ultrasonic detection module and a Beidou navigation and positioning module, the ultrasonic detection module detects whether the parking space has a vehicle or not, and the Beidou navigation and positioning module realizes path navigation for the parking position through communication with the intelligent mobile terminal. The parking method comprises the steps of a), parking space distribution, b), parking space occupation judgment, c), parking space information input, d), navigation path generation, and e), path navigation. The vehicle locating method comprises the steps of 1), vehicle locating path generation, 2), IC card recycling, and 3) parking space occupation judgment. According to the parking and vehicle locating system and method, accurate online detection for whether the parking space is occupied by a vehicle and accurate positioning for a driver in the parking lot are realized, an accurate navigation path from the driver to the parking space can be formed, and parking and vehicle locating are enabled to be more convenient.

The invention discloses a method for detecting moisture content of crude tobacco bales by using a microwave moisture meter on line. The microwave moisture meter is utilized for detecting the moisture content of the crude tobacco bales on line through models as follows: M displayed value is a sum of phi P and Q, wherein in the formula, the M displayed value represents a moisture content value measured by the microwave moisture meter; phi represents a corresponding moisture content signal value measured by the microwave moisture meter; P represents a calibration parameter 1 of the microwave moisture meter; Q represents a calibration parameter 2 of the microwave moisture meter; and values of P and Q are measured through an oven testing method and the microwave moisture meter, then compared and calculated with a least square method according to points, corresponding to the phi, values of a plurality of tobacco bales. The method can accurately, rapidly and simply detect the moisture content of the crude tobacco bales on line.

The invention provides an intelligent type on-line monitoring system for a fuse. The on-line monitoring system comprises a detection device installed on the fuse and a system master station in signal connection with the detection device. The detection device is provided with a transmitting end for sending information to the system master station, and the system master station is provided with a receiving end for receiving the information sent by a microprocessor. The detection device and the fuse are arranged in a detection box. The detection device comprises a current sensor, a detection terminal voltage sensor, a position sensor, a timer and a temperature and humidity sensor. A processor, a display and a memory are arranged in the system master station, and the system master station is provided with an inquiry device.

The invention discloses a mental load detection method and system and related equipment. The method comprises the steps: after it is detected that a subject completes a preset test task, measuring thebrain of the subject through electroencephalogram test equipment, and acquiring electroencephalogram signals in M channels through the electroencephalogram test equipment; measuring the forehead areaof the subject through a functional near infrared spectrum to obtain a functional near infrared spectrum signal of the forehead area; processing the electroencephalogram signal of each channel to obtain a first characteristic parameter of the electroencephalogram signal in each channel; processing the functional near infrared spectrum signal to obtain a second characteristic parameter of the functional near infrared spectrum signal; and determining the mental load level of the subject for the mental load level according to the first characteristic parameter of the electroencephalogram signalin each channel and the second characteristic parameter of the functional near infrared spectrum signal. According to the method, online detection of mental loads is achieved, and detection of the mental loads is more accurate.

The invention provides an online moisture detection device for a bulk material. The device is characterized in that: the device includes an annular channel in the form of a closed loop, the annular channel is divided into a first section (L1), a second section (L2), a third section (L3), and a fourth section (L4); the annular channel is composed of an annular cover body (A) and an annular bottom plate (B), the annular bottom plate (B) is connected with a driving device (C) through a support bar (B1), multiple through holes (B2) are arranged along the circumference of the annular bottom plate (B) and multiple charging containers (2) are correspondingly placed on these through holes (B2), wherein the first section (L1) is a charging area, the second section (L2) is a microwave drying area, the third section (L3) is a detection area, and the fourth section (L4) is a discharge area. The moisture of different types of the bulk material can be detected in real time, rapidly, online and accurately, the measurement precision can reach the moisture measurement precision of a manual sampling, drying and weighting method, and the existing problem is solved in a large degree.

The invention provides a digital substation time synchronization performance detection method and device thereof. The method comprises inter-station time synchronization performance detection and intra-station time synchronization performance detection, wherein the inter-station time synchronization performance detection comprises time accuracy detection, time reliability detection and time security detection, and the intra-station time synchronization performance detection comprises direct connection time synchronization performance detection, time synchronization performance detection through a switch, and the network storm resistance detection. The technical scheme for detecting a full set of PTP timing systems in running provided by the invention integrates a digital substation GOOSE network, an SV network and a PTP network into one, so that the actual engineering guiding significance of the detection result is improved. The technical scheme provided by the invention can capture a PTP synchronization status in real time, the synchronization performances reflected under different synchronization modes meet the regulation of the IEEE 1588 standard, and the detection precision is higher than the 1 microsecond highest time synchronization precision of the digital substation.

The invention discloses an optical fiber sensing system and a method for online monitoring of contents of hydrogen and impurities of a petrochemical hydrogen-loaded pipeline. The system comprises a measuring gas guiding bypass pipe, an optical signal enhancement gas chamber, a light source unit, a signal detection unit, a signal demodulation unit, a data processing unit and the like, wherein laser emitted by the light source unit is guided into the optical signal enhancement gas chamber through optical fibers and optical cables and excites a Raman signal of gas; meanwhile, the signal detection unit transmits a signal detected by the detection unit to the signal demodulation unit positioned in a non-explosionproof zone through a transmission optical cable; demodulated data are transmitted to the data processing unit through an RS-485 serial port line for data processing and real-time display of measurement parameters. The system can simultaneously perform online monitoring of the contents of high-concentration hydrogen and impurity gases (such as CH4, CO, CO2 and H2S) in a process pipeline in industries such as petrifaction; in addition, a sensor is intrinsically safe, so that online monitoring of hazardous gases such as hydrogen is safer and more accurate.

The invention relates to a material surface color feature on-line automatic detection method, and belongs to the technical field of automatic on-line detection of material surface quality. First a material standard sample is selected according to real-time environment and the material type, by adopting a plurality of high-precision cameras capable of covering the surface of the whole material standard sample to be detected to shoot a plurality of original images of the surface of the material standard sample to be detected, and after image processing, a standard color classification threshold value is obtained; for a material to be detected, by adopting the plurality of high-precision cameras capable of covering the surface of the whole material to be detected to shoot a plurality of original images of the surface of the material to be detected, and after image processing, using the obtained standard color classification threshold value to calculate the surface color features of material to be detected; and the surface color features of the material to be detected are compared with evaluation criteria, and surface color quality grading of the material to be detected is obtained through on-line automatic detection. The detection method has relatively high application value, and the method is simple and easy to implement.

The invention discloses a watermelon density on-line detection method and a watermelon density on-line detection device. The device comprises a detection system, a conveying system and a control system. The method comprises the following steps of: after putting a watermelon into a resonant cavity, inputting a frequency-modulated wave with a certain frequency into the resonant cavity so as to cause that air in the resonant cavity vibrates to resonate; performing fast Fourier transformation on a resonant signal, and extracting a resonant frequency so as to obtain the size of the watermelon; and dividing the quality of the watermelon by the size of the watermelon to obtain the density of the watermelon. According to the method and the device, the quality and size of the watermelon can be detected on line quickly, non-destructively and accurately. By designing two conveying systems, the watermelon can be automatically detected, the detection speed can be increased, errors caused by manual operation are reduced, and the detection accuracy is improved. By aiming at the problems that the conventional watermelon size detection way is not diversified and the conventional method is time-saving and labor-saving, a new idea is provided, and a new technical way is provided for subsequent quality detection and grading.

The invention provides an online moisture detection device for a bulk material. The device includes four slideways which form a square closed loop, and multiple charging containers (2) are placed in the closed loop; a first slideway (L1) is a charging area, a second slideway (L2) is a microwave drying area, a third slideway (L3) is a detection area, a fourth slideway (L4) is a discharge area; eachslideway is provided with a linear motor with a driving bar, and the linear motors are used for pushing the charging containers (2) to slide from one position to a next position. The moisture of different types of the bulk material can be detected in real time, rapidly, online and accurately, and the measurement precision can reach the moisture measurement precision of a manual sampling, drying and weighting method.

The invention provides an online chemical fertilizer quatlity detection system which comprises a sample conveying belt, an optical probe, a detection and control unit, a V-shaped baffle and a main server monitoring device, wherein chemical samples are conveyed by virtue of the sample conveying belt; the optical probe is arranged above the sample conveying belt; the V-shaped baffle is assembled at the front end of the lower part of the optical probe; during a process of conveying the chemical samples on the sample conveying belt, the lower sides of the V-shaped baffle and the optical probe are inserted into the chemical samples; the detection and control unit is internally provided with a wireless communication module; the optical probe transmits collected spectrums to the detection and control unit, and the spectrums are subjected to light split and photovoltaic conversion, generated signals are transmitted to the wireless communication module; the main server monitoring device is used for modeling and quantitatively analyzing the signals wirelessly received from the wireless communication module. The online chemical fertilizer quality detection system provided by the invention is convenient, efficient, accurate, relatively low in cost, free from sample damage, free from chemical reagent consumption and free from environmental pollution.

This application relates to a method and device for controlling the moisturizing process of medicinal materials. The medicinal material moisturizing device includes a medicinal box, a vacuum pump and a vacuum pressure sensor connected to the inner cavity of the medicinal box. The medicine moistening rack on the load cell, the vacuum pressure sensor, the load cell and the controller are connected in communication, and the moisture content detection model corresponding to the moist medicinal materials is stored in the controller; the method for controlling the medicinal material moistening process includes the following steps: adding the medicinal materials to In the moistening medicine box, when the decompression in the moistening medicine box is reduced to negative pressure, steam is passed into the moistening medicine box to moisten the medicinal materials; the weight data of the medicinal materials collected by the weighing sensor and the moistening medicine box collected by the vacuum pressure sensor The vacuum degree data in the machine is transmitted to the controller, and the controller calculates the moisture content of the moistened medicinal materials in real time according to the moisture content detection model, and judges whether the moistening end point has been reached, realizing the real-time monitoring of the moistening process and the rapid judgment of the moistening end point.

The invention discloses an online detection device for soil elements, which comprises a limit plate, a control detection room, a pulley, a laser collection box, a laser emitter, a pulley, a fixing bolt, a dust cover, a rotating shaft, a soil-breaking blade, a belt, and a punching knife , the support rod vertically passes through the limiting plate and is fixedly connected to the top of the dust cover at the bottom of the limiting plate, and a laser emitter is fixedly connected to the bottom of one side of the limiting plate, and the same A laser collection box is placed on the top of the side, a motor is fixedly connected to the center of the top of the limiting plate, a pulley is fixedly connected to the output shaft of the motor, the pulley is connected to the rotating shaft through a belt, and the rotating shaft is flexibly connected On the support rod, the support rod is fixedly connected to the bottom of the dust cover, the surface of the rotating shaft is fixedly connected with a soil-breaking blade, the control detection chamber is welded and bonded to the right side of the limit plate, and the A punching knife is fixedly connected to the center of the bottom of the control detection chamber.

The invention provides real-time solution detection equipment and a real-time solution detection method, the real-time solution detection equipment is externally connected with an electromachining system or a waste liquid treatment system, the real-time solution detection equipment comprises an equipment shell, a controller, a solution detection system, a liquid conveying system and a liquid return system, the liquid return system and the liquid conveying system are both provided with distribution filling type peristaltic pumps, and the solution detection system is provided with a heat exchange cooling pipe. The phenomenon that a detection sensor is damaged due to direct measurement in the electromachining solution containing current is avoided, parameters of the electromachining solution can be continuously, accurately and effectively detected on line in real time so that the parameters can be adjusted in time when deviating, it is guaranteed that the production process is stable and controllable, and the precision of the electromachining solution is improved; the equipment and method can be applied to industrial production, improve the production quality, can also be applied to scientific research experiments, and provide an experiment detection platform for research of a processing mechanism; and waste liquid generated after processing can be discharged after treated effluent waste liquid reaches the standard, and environmental pollution caused by poor treatment is avoided.

The present application relates to a method and device for detecting mutual inductance parameters of a coupling loop of a wireless power transmission system. The method includes: superimposing n low-frequency sinusoidal harmonic signals of preset frequencies on the original PWM control signal of the magnetic coupling resonance wireless power transmission system to obtain the superimposed control signal; inputting the superimposed control signal into the primary side circuit; The output signal of the circuit is separated, and the output harmonic components of the voltage and current corresponding to the n preset frequencies are detected to obtain the output harmonic voltage and output harmonic current corresponding to the n preset frequencies; The output harmonic voltage and output harmonic current are calculated based on Hough's voltage law, and the equivalent element parameters of the coupling loop are calculated; according to the equivalent element parameters of the coupling loop, the mutual inductance parameters of the coupling loop are determined. The method can detect the mutual inductance parameters of the coupling loop.