159 results about "Single measurement" patented technology

The invention discloses an airborne radar ground moving target stable tracking method, and belongs to the technical field of avionics, and the method comprises the following steps: S1, obtaining and fusing multi-modal measurement data; s2, clutter suppression and pretreatment; s3, target state estimation; s4, data association and track repair; s5, group target collaborative tracking; and S6, outputting a tracking result. According to the airborne radar ground moving target stable tracking method, multi-mode fusion and track adhesion are used for supplementing a single measurement short plate and repairing a broken track; by means of clutter map and optimization filtering strong clutter suppression, the state precision is improved; the multi-target tracking is optimized by using the graph model and the group target modeling, the complexity is reduced, the prior is fused, and the tracking stability of the complex scene is enhanced.

The invention discloses a civil construction intelligent management and control method and system based on the Internet of Things, and relates to the technical field of buildings, through selecting a to-be-tracked reference point set on site and constructing a drift record sequence and a static credible domain, the time continuity stability of reference points in the construction process can be quantified in real time, and the construction efficiency is improved. And the omission of early drift symptom in single measurement is avoided. The validity of the reference point is judged in combination with the static credible domain, and an error propagation command is triggered through a drift trend, so that the system can intervene and dynamically correct an effective point set and the credible domain when the error is still in an early stage, deviation accumulation and upward propagation are prevented, and the risk of staggered layers of the whole structure is reduced. And constructing a full-field error vector field by utilizing clustering analysis, identifying a high-risk area and a high-risk offset component, and uploading the high-risk area and the high-risk offset component to a construction main control system to generate a retest and re-setting-out task, so that automatic identification and priority correction of the risk component are realized.

The invention discloses a power distribution network fault type diagnosis and section positioning method and equipment, and the method comprises the steps: selecting eight-channel waveforms of a single measurement point of a fault line: three-phase zero-sequence voltage, zero-sequence voltage, three-phase current and zero-sequence current as research and judgment waveforms; based on a fault waveform data set and a batch simulation waveform data set collected by an actual line, a waveform data set with high quality, wide coverage scene and balanced type distribution is generated through a conditional generative adversarial network; each channel of waveform of the fault waveform is subjected to classification complete set normalization, feature region interception and field transformation dimension expansion to form a two-dimensional field matrix, eight groups of two-dimensional matrixes are preprocessed to form eight-channel two-dimensional matrix tensors, and a model training set is formed in combination with fault types and fault section labels; according to the invention, classified identification of the fault type and the fault section of the fault waveform is realized; according to the method, troubleshooting can be accelerated, the power supply reliability of the power distribution network is improved, and technical support is provided for grounding fault diagnosis completely depending on data driving.

The application discloses a kind of automatic monitoring device and method of tree trunk radial growth, it is related to measurement technical field, device includes: electric rotating platform, laser ranging sensor, data processing equipment and support platform;Electric rotating platform drives laser ranging sensor to rotate a week, and laser ranging sensor determines the distance of all sheltering objects to sensor in real time;Data processing equipment receives the real-time ranging data sent by laser ranging sensor;After measuring a circle, the ranging data of current ranging data set is clustered, and a plurality of ranging data clusters are obtained;Right-angle coordinate modeling and circle fitting are carried out on each ranging data cluster, to determine the position and diameter of each tree trunk;Through the diameter of tree trunk obtained by continuous measurement at different times, the radial growth rate of tree trunk is calculated. By implementing the present application, the growth rate of multiple tree trunks can be measured automatically in a non-contact form, solving the problem of contact measurement affecting tree growth and only single measurement in the prior art.

This invention provides an iterative measurement device and method for the surface shape of a cylindrical axially stressed component, belonging to the field of component measurement technology. It solves the problems of low measurement accuracy, single measurement method, low algorithm efficiency, and insufficient precision of existing measurement devices. This measurement device can detect the perpendicularity of the cylindrical axially stressed component, ensuring its vertical placement. It can stably adjust the height of the probe detection mechanism and the laser measurement mechanism, maintaining stable positions without wobbling, thus satisfying the requirement of measuring the outer contour of the cylindrical axially stressed component's surface twice. By controlling the main unit in conjunction with the probe detection mechanism and the laser measurement mechanism, it achieves rapid and accurate measurement of the cylindrical axially stressed component's appearance shape. The measurement method of this invention does not cause errors in the measured specimen's appearance due to the irregular shape of the track itself. Utilizing an iterative algorithm, it can achieve precise measurement of the appearance of the cylindrical axially stressed component and the track.

This invention discloses a testing device for the operating performance of a lever mechanism simulating load, belonging to the field of high-end equipment performance testing. The core innovation of the device lies in the sequential connection of the lever, crank, connecting rod, slider, and frame assembly to form a crank-connecting rod-slider core transmission and load simulation mechanism. This mechanism integrates adjustable load simulation and integrated synchronous measurement functions. By configuring counterweights, replacing elastic elements, and adjusting connection angles and lever arms, it can accurately simulate nonlinear, multi-dimensional coupled actual operating loads. Simultaneously, a sensor network composed of force sensors, tilt sensors, and acceleration sensors respectively set at key nodes such as the lever and crank synchronously collects multi-dimensional force / torque, displacement, and acceleration parameters throughout the entire operating process. This invention solves the problems of load distortion, single measurement, and asynchronous data in traditional testing, achieving accurate and universal testing of the operating performance of lever mechanisms.

The application discloses a wafer polishing laser interference closed-loop pressure control method, and relates to the technical field of semiconductor manufacturing, and comprises the following steps: S1: a ceramic plate is triggered to automatically measure a program after being turned over with a wafer; S2: a laser interference measurement head is driven by a six-axis mechanical arm positioning system to non-contact scan T2 / T4 points of the wafer, and thickness distribution data is acquired; S3: a Zernike polynomial is adopted to fit the thickness distribution data to generate a three-dimensional distribution graph, and a pressure correction amount is calculated based on a pressure prediction model constructed by a process kinetics model and a support vector machine regression algorithm; S4: an abnormal processing module is used to detect data outliers in real time, and a device protection strategy is triggered when a deviation exceeds a set threshold; and S5: a pressure control instruction is transmitted to a polishing head by a PLC controller through a PROFINET bus. By means of non-contact laser interference measurement, the laser interference technology is applied to wafer thickness detection after polishing for the first time, and single measurement time is less than 20 seconds, so that the detection efficiency is significantly improved.

Techniques are provided for generating an occupancy grid based on input from a plurality of heterogeneous sensors. An example method for generating an occupancy grid includes obtaining detection information from a plurality of heterogeneous sensors; generating a single measurement grid based on detection information from the plurality of heterogeneous sensors; determining the occupancy probability of a plurality of cells in a single measurement grid; and outputting the occupancy grid based at least in part on the occupancy probability.

The invention relates to the technical field of surgical measurement, in particular to a real-time measurement method and system for the length and eccentric distance of lower limbs in hip replacement. According to the technical scheme, the method comprises the following steps that anatomical feature points on the two sides of a patient are obtained, wherein the anatomical feature points at least comprise the positions of anterior superior iliac spines on the two sides and the positions of high points on the inner side and the outer side of ankle joints on the two sides; and according to the obtained anatomical feature points, calculating and establishing a normal position reference plane of the patient. By means of the non-invasive body surface positioning and optical tracking technology, the length and the eccentric distance of the lower limb can be accurately measured in real time in the hip replacement. The method comprehensively considers the change of both sides of the acetabulum and the femur, avoids the trauma risk of traditional invasive navigation and the deviation of single measurement, and provides a quantitative basis for doctors through intraoperative dynamic data feedback and preoperative, intraoperative and postoperative whole-course evaluation, thereby improving the surgical precision and reducing the occurrence rate of complications with unequal lengths of lower limbs.

The invention discloses an environment-friendly digital flat weighing platform based on a low-power-consumption sensing network, and belongs to the technical field of intelligent traffic detection and metering. The using method of the weighing platform comprises the steps of obtaining an actual weighing value of a vehicle based on the environment-friendly digital flat weighing platform, obtaining an estimated weight value of the vehicle based on the image recognition module, and diagnosing the environment-friendly digital flat weighing platform based on the actual weighing value and the estimated weight value. According to the method, accurate recognition of the vehicle model, the axle number and the loading state is achieved through the improved YOLOv8s algorithm, and the reliable weight pre-estimated value is generated based on the accurate recognition of the vehicle model, the axle number and the loading state. The pre-estimated value is compared with the actually measured weight of the sensor in real time, so that the self fault of the weighing platform or the abnormal state of the vehicle can be effectively diagnosed, and the traditional weighing is upgraded from single measurement to an intelligent detection and diagnosis system. Meanwhile, the system has a fault self-early-warning capability, and is combined with a low-power-consumption sensing network and solar power supply, so that the operation and maintenance efficiency is remarkably improved, the energy consumption is reduced, and effective unification of accurate metering, intelligent diagnosis and green operation is realized.

The invention provides a laser radar ranging method and system using a single photon avalanche diode. A laser radar range finding method using a single photon avalanche diode comprises the following steps: generating and emitting a laser pulse sequence, the laser pulse sequence comprising a plurality of pulses, the plurality of pulses having a plurality of time intervals, each time interval being an integral multiple of the resolution of a time-to-digital converter, the sum of all the time intervals is a preset fixed value, so that the duration of a single measurement period is fixed; receiving an echo signal reflected by a target by using a single photon avalanche diode detector, and quantizing the echo signal into a receiving vector by using a time-to-digital converter; and performing cross-correlation operation on the receiving vector and a transmitting vector corresponding to the laser pulse sequence, and calculating a target distance according to a peak value position of a cross-correlation operation result. According to the invention, hardware cost is reduced, and high-efficiency ranging with a stable frame rate is realized at the same time.

The invention discloses an electric energy metering data anomaly detection method and system based on multi-modal feature fusion, and relates to the technical field of electric measurement. The method comprises the following steps: constructing a main measurement mode and a derived measurement mode, forming an energy conservation reachable evolution interval by utilizing the instantaneous electric parameters of the main mode and combining the transformation ratio of the mutual inductor, a metering channel and a sampling synchronization factor; mapping a derived mode to the interval, judging constraint triggering, and establishing a cross-mechanism consistency model; and extracting evolution violation features in multi-cycle tracking, and executing measurement credible reconstruction so as to generate a measurement anomaly detection result. The technical problems that existing electric energy metering depends on a single measurement mode, metering abnormity is difficult to effectively recognize and correct in a complex power grid environment, and the accuracy and reliability of metering data are insufficient are solved, metering consistency detection through multi-mode fusion is achieved, precise recognition and credible reconstruction of metering abnormity are achieved, and the accuracy and reliability of metering data are improved. And the accuracy and the reliability of the electric energy metering data are improved.

This invention relates to the field of physics experiments, and more particularly to a convex lens imaging experimental method and system based on machine vision and data collaboration. The system includes a guide rail, a convex lens, a sliding frame, a light source, a support frame, a stepper motor, a lead screw, a screen, an extension arm, a camera, a controller, and a processor. This invention automatically identifies the optimal imaging position by combining a camera and a processor, eliminating the subjectivity of human judgment, improving the objectivity and reliability of experimental conclusions, and uploading experimental data to the cloud in real time. This enables the aggregation, sharing, and visualization analysis of multiple sets of data, ensuring the objectivity and accuracy of a single measurement while supporting the summarization of imaging patterns from multiple sets of data, thus enhancing the scientific rigor and depth of the experiment.

The invention discloses a bump measurement method and device, electronic equipment, a computer readable storage medium and a program product, and the measurement method comprises the steps: obtaining the initial three-dimensional point cloud data of a wafer bump through a three-dimensional measurement module, and dynamically evaluating the confidence of the initial three-dimensional point cloud data; when the confidence coefficient comparison result meets a triggering condition, triggering a re-collection strategy, adjusting the relative pose of the measurement module and the wafer to carry out supplementary collection, and screening high-confidence-coefficient data from the measurement module and the wafer; and performing pose compensation on the screened high-confidence data, and performing data integration on the initial three-dimensional point cloud data to generate a complete three-dimensional shape. According to the scheme, structural shielding and optical interference are avoided through multi-pose acquisition, high-confidence data are screened to integrate original data, data missing and precision limitation of traditional single measurement can be overcome without greatly increasing hardware investment, high-precision and high-efficiency measurement support is provided for high-density bumps, and the measurement efficiency is improved. And the method has significant economic value for quality monitoring and yield improvement of the advanced semiconductor packaging process.

The application discloses a granite corrosion fatigue life prediction method based on approximate conformal dimension evolution, relates to the technical field of material damage mechanics, and comprises the following steps: collecting crack images under different cycle numbers of granite subjected to the action of corrosion medium and cyclic load, and constructing a crack set; calculating the approximate conformal dimension of each observation point after pretreatment and obtaining an evolution sequence by monotonicization; driving to establish a discrete damage evolution relationship by using a dimension increment, and calibrating parameters by using early data; and extrapolating damage accumulation of an unobserved interval, and determining the prediction life when a threshold is reached. The application integrates corrosion parameters into edge weights, realizes joint measurement of environment and crack geometry, selects the minimum box dimension by traversing parameters, overcomes single measurement limitations, depicts a corrosion fatigue accumulation process by using an increment-driven recursive model, realizes effective prediction under partial life data by using two-stage calibration and early data extrapolation, and improves engineering practicability and early warning capability.

A sensor arrangement has a structure extending along a length, an optical fibre carrier, and an optical fibre sensor carried by the optical fibre carrier. The optical fibre carrier is fixed to the structure proximal to each end of the structure and is formed of a first carrier portion and a second carrier portion that are movable relative to each other and is formed substantially of a material having a first coefficient of thermal expansion. The optical fibre sensor has a single measurement point and is fixed to the optical fibre carrier either side of the single measurement point; and the structure is formed of a material having a second coefficient of thermal expansion which is different to the first coefficient of thermal expansion

The objective is to provide a surface roughness measuring device and a surface roughness measuring method that can measure the surface roughness of an object being measured even when it is moving at high speed. [Solution] The system comprises a laser light source that irradiates the surface of an object to be measured with laser light at an angle of 5 to 45 degrees, a light receiving sensor that receives reflected laser light reflected at a measurement point on the surface of the object to be measured, and a laser light roughness calculation means that calculates a laser light roughness value, which is the surface roughness value of the object to be measured, from the amount of reflected laser light received by the light receiving sensor, wherein the laser light roughness calculation means calculates the laser light roughness value from the distribution of the magnitude of the amount of reflected laser light at a single measurement point.

The present invention provides a sea surface target tracking method based on real-time estimation of detection accuracy, which determines the single-shot target range accuracy σ of the radar. R Determine the single-shot angular accuracy σ of the radar. A According to the single measurement target distance accuracy σ R and single-detection angle measurement accuracy σ A A Gaussian distribution model is constructed; the radar's current measurement parameters of the target are obtained and input into the Gaussian distribution model to determine the range of range and angle accuracy under different probabilities of the current detection result. The measurement parameters include at least the target's range accuracy, size, and signal-to-noise ratio. The target's association threshold is updated in real time based on the accuracy range of angle and range. The trajectory initiation strategy is updated based on the updated association threshold. This enables rapid initiation or rapid convergence of the target trajectory. Furthermore, during the multi-hypothesis branch selection process, branches with high-precision measurement initiation are prioritized for output, improving the speed and accuracy of branch switching.

The invention relates to a communication method, equipment and a storage medium. The method comprises the following steps: receiving configuration information sent by network equipment; measuring a first candidate cell for multiple times according to the configuration information to obtain a plurality of measurement results of the first candidate cell; and determining whether the first candidate cell is a target cell or not according to the change condition of the plurality of measurement results of the first candidate cell. Namely, the terminal equipment can determine whether the first candidate cell is the target cell according to the change condition of the measurement result of multiple measurements performed on the first candidate cell, so that the terminal equipment does not perform cell switching according to the measurement result, the frequency of cell switching performed by the terminal equipment is reduced, and the system performance is improved.

The invention provides a point contact measuring rod adaptive to a water-cooled magnet, and relates to the technical field of low-temperature measurement. The point contact measuring rod adapted to the water-cooled magnet comprises a measuring head provided with a driving assembly, and the driving assembly is used for driving a sample to be measured and / or a probe to move at least in a three-dimensional space. The point contact measuring rod can be matched with a water-cooled magnet device to measure the superconducting energy gap of a superconducting material, the contact position between the tip of the metal probe and a sample can be changed through movement of the driving assembly, measurement of multiple positions of the same sample can be achieved without frequent insertion and extraction of the measuring rod, and the problems that the probe insertion distance is uncontrollable, and the measurement accuracy is high are solved. Tunnel junction control is unstable, and single measurement contact position is single.

The application discloses a method for calculating alcohol concentration based on secondary compensation, and relates to the technical field of alcohol concentration detection. The application innovatively introduces fluid viscous damping characteristics as a third measurement dimension, uses the driving gain parameter of the Coriolis force mass flowmeter to inversely calculate the actual viscosity of the fluid in real time, and breaks the single measurement limitation of the traditional density and temperature. Meanwhile, the physical characteristics of the solid in the brewed wine are extremely sensitive to the viscosity, the dry extract content in the wine is accurately inversely estimated based on the viscosity deviation, the density virtual high value caused by the solid is further quantitatively calculated, and the measured density is subtractively corrected. Through the secondary compensation mechanism, the interference of the solid is effectively removed, and the real density of the pure base liquor is restored.

According to the intelligent control method and system for the dental planter for measuring the drilling depth, multi-dimensional target drilling data can be collected, measurement errors caused by a single measurement mode are reduced, and therefore the measurement accuracy of the drilling depth of the dental planter can be improved; a data processing result capable of indicating the real-time drilling depth is obtained through calculation and comprehensive processing, and accurate measurement and calculation of the drilling depth of the dental planter are achieved; in addition, the drilling progress can be displayed and fed back in real time, and the consulting intuition, convenience and timeliness of the drilling progress are improved; besides, in the drilling depth calculation process, inclination angle data can be effectively utilized, and inclination angle compensation calculation operation can be executed, so that the dental planter can adapt to drilling conditions of different angles, the influence of a complex oral cavity environment on drilling depth measurement is effectively dealt with, and the drilling operation fineness and reliability are improved.

This application provides a near-field delay correction method for optical true-delay phased array surfaces, relating to the field of phased array technology. The method includes: sending a drive signal to a scanning gantry via an automatic control test system to align a test probe located on top of the scanning gantry with the channel under test; sending a single-measurement start signal to a beam control system via the automatic control test system, causing the beam control system to control the activation of the corresponding channel under test based on the single-measurement start signal; sending a single-pulse point frequency signal to a pulse signal generator via the beam control system; measuring the delay of the current channel under test using a delay measurement unit and saving the delay data; and after determining that all channels under test have completed measurement, sending the delay data of all units to the automatic control test system or a debugging computer. This application uses a delay measurement unit, which can accurately measure the time delay between a reference pulse signal and the pulse signal under test, thereby correcting the transmission and reception delays of all channels.

The invention relates to the field of liquid chromatography and mass spectrometry methods, and provides a method and device for determining an MRM ion pair, electronic equipment and a storage medium. The method for determining the MRM ion pair comprises the following steps: inputting known information of a mixture into a prediction model to obtain predicted parent ions and predicted fragment ions of each substance in the mixture output by the prediction model, and obtaining a measurement instrument to perform single sampling and measurement on the mixture, obtaining a plurality of chromatographic peaks and actually measured parent ions and actually measured fragment ions corresponding to each chromatographic peak; matching the predicted parent ions with the actually measured parent ions, and matching the predicted fragment ions with the actually measured fragment ions; a target substance and an MRM ion pair corresponding to the target substance are determined, the target substance is a substance successfully matched with one of the chromatographic peaks, and the MRM ion pair comprises actually measured parent ions and actually measured fragment ions. Therefore, the MRM ion pairs of various substances in the mixture can be determined through single measurement on the mixture, and the measurement efficiency is improved.

A composite on-site flow meter calibration method is disclosed. This method allows for measurement of individual instruments using standard instruments, and can switch between standard instruments and volumetric measuring devices for simultaneous measurement, as well as between standard instruments and gravimetric measuring devices for simultaneous measurement. Therefore, it enables free switching between various measuring devices for comparison of measurement values, solving the problem of large measurement errors caused by single measurement methods and greatly improving the accuracy of instrument calibration. Furthermore, the instrument clamping device in this calibration method can simultaneously clamp multiple instruments in series for measurement, resulting in high efficiency and allowing for easy adjustment of the clamping quantity as needed, demonstrating strong adaptability. The gravimetric measuring device in this calibration method can accommodate the efficient alternation of two weighing devices while ensuring a relatively stable liquid level in the oil tank, which is beneficial for flow stability during the weighing process.

The invention discloses a rotary 3D profile measurement system, and belongs to the technical field of three-dimensional profile measurement. Comprising a machine body, a 3D measuring unit is installed on the inner side of the machine body, the 3D measuring unit comprises a laser displacement sensor, a rotation driving mechanism, a control module and a data processing module, and the laser displacement sensor is used for measuring contour information of a measured object in the X direction and the Z direction; the rotary driving mechanism comprises a rotary motor fixed on the inner side of the machine body; an angle encoder is mounted at the rotating end of the rotating motor; the rotating end of the rotating motor is fixed to the center of the rotating platform. The laser displacement sensor is fixedly arranged at the bottom of the rotating platform; the control module is connected with the rotation driving mechanism and the laser displacement sensor. The rotary 3D contour measurement system is simple, the scanning range is adjustable, the diameter of a detection circle changes along with the measurement distance, the measurement requirements of different height ranges are met, and multiple welding seam features are detected at the same time through one-time measurement.

A depth data measuring head (600, 700) comprising: a structured light projection apparatus (110, 610, 710) used for projecting, under the drive of a driving apparatus (114, 314) and at different projection angles, a beam having a texture to a measured space so as to form different textures on an object to be measured; and first and second image sensors (620, 630; 720, 730) that are respectively arranged on both sides of the structured light projection apparatus (110, 610, 710), the first and second image sensors having a predetermined relative spatial position relationship and imaging the measured space at least twice so as to obtain at least two sets of images having different texture distributions, wherein the at least two sets of images are used for obtaining single-measurement depth data of the object to be measured. The structured light projection apparatus (110, 610, 710) that reflects, at different angles, structured light generated by a light source module (I) is used, so that rapid, economical and low-failure-rate multi-pattern projection is implemented. Furthermore, the structured light projection apparatus (110, 610, 710) matches multiple pairs of binocular sensors (723, 724; 733, 734) sharing a light path, thereby further shortening the frame interval and improving the quality of depth fusion data. Also disclosed is a depth data computing device and measurement method.

This invention relates to a method and system for simultaneously measuring thermal conductivity, specific heat capacity, and interfacial thermal resistance, belonging to the field of thermophysical property measurement technology. First, a TDTR (Transient Thermal Resonance) measurement is performed on the sample under test using a preset laser spot size and modulation frequency that meet preset criteria, obtaining a measurement signal. Then, the initial parameter values ​​of the sample are input into a heat transfer model to obtain a simulated signal. The initial parameter values ​​are continuously adjusted until the deviation between the simulated signal and the measured signal is less than a preset value. At this point, the initial parameter values ​​are used as the measured parameter values ​​of the sample. Both the measured signal and the simulated signal include a negative delay time period of -20 to -5 ps and a positive delay time period of 0.1 to 4 ns. A single TDTR measurement can simultaneously determine the thermal conductivity, specific heat capacity, and interfacial thermal resistance of the sample, greatly expanding the measurement capabilities of TDTR technology.

The application relates to a loop time offset determination method and device, a terminal, a chip and a chip module, and relates to the technical field of mobile communication. The method can overcome the limitation of a single measurement index, avoid errors and interference introduced by invalid time offset estimation attempts, and improve the efficiency and accuracy of time offset determination. The method comprises the following steps: obtaining time offset estimation results of multiple rounds of time offset estimation attempts for a control channel; the time offset estimation results comprise a control format indication measurement value and a cell-specific reference signal signal-to-noise ratio; for each round of time offset estimation attempt, a time offset adaptation degree representing the advantages and disadvantages of the time offset estimation result of the round is determined according to the control format indication measurement value and the cell-specific reference signal signal-to-noise ratio corresponding to the round; and the loop time offset is determined according to the time offset adaptation degrees corresponding to the rounds.

This invention provides a method for determining the dislocation density of diamond single crystals using cathodoluminescence spectroscopy, which can be applied to the field of semiconductor material characterization and defect detection. This method draws upon and develops upon colorimetric methods based on ultraviolet light intensity, utilizing the idea of ​​single measurement and quantitative analysis based on different peak ratios. It also incorporates a decoupled architecture of "destructive calibration + non-destructive measurement." First, at least five diamond single crystal calibration samples with gradient dislocation densities are selected. Cathodoluminescence spectra are acquired under low temperature and high vacuum conditions. The integrated intensity I of the A-band emission peak related to dislocations is extracted through multi-peak fitting. A and the integral intensity I of the free exciton emission peak FE Calculate the ratio R=I A / I FE Subsequently, the calibration sample was subjected to hydrogen-oxygen dry etching, and the surface dislocation density N was obtained by statistically analyzing the etching pits. The proportionality coefficient k was obtained by linear fitting with N as the ordinate and R as the abscissa. For the sample to be tested, the spectrum was collected under the same conditions and the ratio R was calculated. Substituting this value into the model N=k·R, the surface dislocation density can be quantitatively obtained.