899 results about "Laser probing" patented technology

The invention provides a methane leakage anomaly detection system and method based on dual-light fusion, and belongs to the field of industrial safety detection. According to the system, a double-light-path holder type laser detector is arranged in a monitoring area, and methane concentration and image data are synchronously acquired through a 1653nm near-infrared laser module and a visible light image module. Time features (mean values, trends and the like) are extracted from the concentration data through time sequence analysis, and spatial features (edges, textures and the like) are extracted from the image data through deep learning; the system fuses time and space features to generate a comprehensive feature vector, reduces the calculation complexity through a dimension reduction technology, and retains core features at the same time. And constructing an anomaly detection model based on an unsupervised learning algorithm, identifying anomaly features in real time, and triggering an alarm. The system realizes real-time and accurate detection of methane leakage, and enhances the reliability and efficiency of industrial safety.

The invention relates to the technical field of optical engineering, in particular to an AI silicon carbide lens-oriented aspheric laser polishing precision online detection and feedback system. Comprising a detection module; the data processing module is electrically connected with the detection module and used for constructing a lens surface three-dimensional model and calculating polishing precision parameters; the feedback control module is electrically connected with the data processing module, is used for generating a feedback control strategy and comprises a strategy generation unit and a parameter optimization unit; an execution module; and an intelligent learning module. According to the design, a laser measuring head, an energy sensor array and an environment sensor are integrated through the detection module, synchronous acquisition of multi-dimensional data such as surface profile, laser energy distribution and environment parameters is realized, and three-dimensional point cloud data with consistent time and space are generated through multi-modal fusion processing (time domain synchronization, space registration and feature enhancement) of the data preprocessing unit; the physical essence of the polishing process is completely represented, and the detection comprehensiveness and the data relevance are improved.

The invention relates to the technical field of acetylene cracking furnace production monitoring, and particularly discloses a CO laser detection system based on a thermal radiation background, which is used for solving the problem that an existing monitoring system is difficult to accurately distinguish CO and water vapor signals because thermal radiation and water vapor generated by high temperature in an existing ethylene cracking furnace interfere infrared absorption measurement of CO. Comprising a quantum cascade laser, a pyroelectric detector, a data processing unit and a signal analysis module, a reference light intensity adjusting module utilizes temperature, humidity and pressure data obtained by an environment parameter sensing module in real time to adjust the CO absorption coefficient through an environment correction factor, the reference light intensity is dynamically calculated and corrected according to the reference light intensity, and the signal analysis module analyzes the signal. The data processing unit is used for dynamic correction of CO concentration monitoring; a CO signal is effectively extracted under a thermal radiation background through a quantum cascade laser and a light beam modulation technology, environment correction and real-time monitoring are combined, CO concentration abnormity is accurately recognized, early warning is given out, and the monitoring sensitivity and reliability are improved.

The invention discloses an aluminum electrolytic capacitor appearance defect detection device, relates to the field of aluminum electrolytic capacitor detection, and solves the problem that an existing detection device is difficult to comprehensively detect an aluminum electrolytic capacitor. The aluminum electrolytic capacitor appearance defect detection device comprises a device base and two first supporting plates, and two first transmission belts are arranged between the two first supporting plates; a push roller is arranged on the outer side of the first transmission belt, supporting frames are installed on the corresponding sides of the two first supporting plates, a first detection box is fixedly installed at the top of the device base, and a plurality of first laser probes are arranged on the inner side of the first detection box; the transfer mechanism is used for detecting pins of the capacitor, and the transfer mechanism is mounted at the top of the device base; through the transfer mechanism, the first laser probe detects the capacitor entering the first detection box, under the conveying of the first transmission belt, the capacitor is turned over, and the pins of the capacitor can face upwards, so that the pins of the capacitor can be detected conveniently, and the effect of comprehensive detection is achieved.

The invention provides a power transmission line windage yaw galloping monitoring and three-dimensional imaging system based on a laser triangulation method, and relates to the technical field of laser ranging, and the system comprises a windage yaw galloping excavation assembly which is used for carrying out windage yaw galloping partition division and windage yaw galloping relation excavation; the windage yaw galloping monitoring module configuration assembly is used for configuring a windage yaw galloping monitoring module; the laser detection data determination assembly is used for determining laser detection data; the three-dimensional imaging module construction component is used for constructing a three-dimensional imaging module; the three-dimensional windage yaw galloping model determining assembly is used for determining a three-dimensional windage yaw galloping model; and the monitoring and early warning assembly is used for carrying out power transmission line monitoring feedback and windage yaw galloping early warning. The technical problems that the power transmission line windage yaw galloping monitoring precision is low and the three-dimensional motion information of the power transmission line cannot be accurately obtained can be solved, and the technical effects of improving the power transmission line windage yaw galloping monitoring precision and ensuring the accuracy of windage yaw galloping early warning by obtaining the dynamic three-dimensional image of the power transmission line are achieved.

The invention belongs to the technical field of laser flatness testing, and particularly relates to a modularized box room installation flatness testing device which comprises a fixed frame and a laser detector located in the fixed frame, and further comprises a moving mechanism arranged on the inner side wall of the fixed frame, and the laser detector is arranged on the moving mechanism. The motor is used for driving the laser detector to move multidirectionally; the first electric push rod is fixedly arranged at the bottom of the moving mechanism, a mounting plate is fixedly arranged at the moving end of the first electric push rod, and the laser detector is fixedly mounted on the lower surface of the mounting plate. Through multi-dimensional innovation of optical protection, a self-adaptive mechanical structure, intelligent environment control, automatic marking and the like, the precision and efficiency of modular box room installation flatness detection are remarkably improved, and manual dependence and environment interference are reduced through intelligent design.

The invention belongs to the technical field of camouflage materials, and particularly relates to a natural vegetation imitating visible light-laser-infrared compatible camouflage film. Comprising a substrate, a thermal infrared dual-band camouflage and near infrared spectrum regulation and control layer and a visible light-laser-near infrared regulation and control layer which are arranged in sequence. The upper-layer natural vegetation imitating structure is mainly used for simulating spectral characteristics of natural vegetation, and meanwhile, the extremely low reflectivity at the position of 1.06 mu m near-infrared laser wavelength is achieved by controlling the thickness of a film layer; the thermal infrared camouflage structure in the middle realizes low emissivity of medium-wave infrared and long-wave infrared; the substrate provides a bearing function. The multilayer film not only can realize refined simulation of a reflection spectrum of natural vegetation in a visible light-near infrared wavelength range, but also has the functions of adjusting different visible light spectrum colors and resisting an infrared detector and a 1.06 [mu] m laser detector; and a visible light-laser-infrared multi-band compatible camouflage performance covering a wide wavelength range of 0.4-14 microns can be realized.

The invention provides a three-dimensional wind field inversion method of a coherent wind lidar, and relates to the technical field of lidar wind measurement, and the method comprises the steps: building a mathematical model of a coherent wind lidar receiving echo signal, and determining an optimal target detection distance; under the optimal target detection distance, emitting a modulated laser detection signal to a target wind field, and processing echo signals which are received by a laser radar and are mixed at different frequencies to obtain an echo signal light field distribution condition; calculating the radial velocity of the wind in the wind field of the target based on the light field distribution condition of the echo signal; the elevation angle of the laser radar is fixed, the four orientations are scanned, radial wind speeds corresponding to the four orientations are obtained, the atmospheric three-dimensional wind field is inverted, and real-time atmospheric wind field three-dimensional detection with high temporal-spatial resolution and high wind measurement precision can be realized.

According to the mining dust monitoring system and method based on multi-wavelength fusion and dynamic compensation, a light chamber is arranged in an inner cavity of a shell, an inlet of the light chamber is connected with a main gas inlet of the shell through a gas inlet pipeline, and an outlet of the light chamber is connected with a main gas outlet of the shell through a gas exhaust pipeline; the laser detection module is mounted in the light chamber and comprises a lens group, a laser source I, a laser source II, a light scattering signal receiving module, a light transmission signal receiving module and a light trap; the first laser source and the second laser source form a dual-wavelength laser source; the micro fan is mounted in the main air outlet; the environment sensing module is mounted in the exhaust pipeline; the method comprises the following steps: constructing an environment drift prediction model; testing the dust concentration in the environment to be tested, and calculating the dust concentration I Csct and the dust concentration II Ct based on the scattered light electric signal and the transmission photoelectric signal; and carrying out environment drift prediction, and obtaining corrected dust concentration data through a fusion calculation mode. According to the system and the method, an accurate dust concentration monitoring result can be obtained.

The invention provides a laser ranging device based on an FPGA (Field Programmable Gate Array) and a single photon avalanche diode. The device is characterized in that the distance measuring device is composed of a field programmable logic gate array calculation core (1), a quenching circuit (2), a single photon avalanche diode (3), a pulse laser driving circuit (4), a pulse laser (5) and an optical lens system (6), and the field programmable logic gate array calculation core (1) comprises time digital conversion logic (11) and calculation logic (12). Wherein the time-to-digital conversion logic comprises correction algorithm logic (111) and carry chain logic (112). According to the invention, a single photon avalanche diode and a dark counting correction algorithm are combined to solve the problems of low precision, low linearity and short measurement distance of the existing distance measurement device. The method can be used for detecting the distance by laser, and can be widely applied to the fields of automotive electronics, medical treatment, industrial robots, national defense, aerospace and the like.

The invention discloses an indoor toxic and harmful gas three-dimensional imaging and tracing method and equipment, and the method comprises the steps: placing remote measurement instruments based on a laser detection principle at different corners in a room, obtaining the remote measurement data of each space layer at different scanning angles, and positioning a gas concentration high-value region; dense point locations are arranged in a gas concentration high-value area of each spatial layer, an in-situ measurement instrument based on a spectrum detection principle is utilized to measure and obtain in-situ data on the point locations, and meanwhile, extremely-high-resolution poisonous and harmful gas accurate traceability is realized; the two-dimensional distribution of the gas concentration of each space layer is obtained through remote measurement and in-situ data reconstruction, and is further mapped to a three-dimensional space to realize three-dimensional imaging and gas traceability. A wide-area light beam scattering gas telemetering instrument and a multi-pass reflection ultra-sensitive gas in-situ measuring instrument are autonomously designed, so that full-space rapid three-dimensional imaging and accurate traceability can be realized, system errors are reduced, an extremely low detection limit is achieved, and the feasibility, accuracy and high efficiency of the method are ensured.

The invention provides open pit coal mine goaf detection equipment and a goaf detection method. The open-pit coal mine goaf detection equipment comprises a vehicle frame which is provided with a detection hole; a plurality of telescopic support parts; the pulley assembly comprises a pulley frame and a pulley, and the pulley frame is arranged on the frame; the first winch, the second winch and the third winch are all arranged on the frame; a data integration display device; the drilling television module is used for imaging and detecting a goaf; the three-dimensional laser scanning detection part comprises a three-dimensional laser data receiver, a second transmission line and a three-dimensional laser scanning module; and the sonar detection part comprises a sonar data receiver, a third transmission line and a sonar detection module. Therefore, the open pit coal mine goaf detection equipment has the advantage of being convenient to detect the goaf.

The invention discloses a system and a method for directly adjusting optical power stability by using an anti-phase power detection signal. The system comprises a laser emitting device, a detection device and an adjustment driving device, the laser emitting device emits laser and outputs laser with stable optical power, and the detection device detects the laser and outputs a power detection signal; and the adjustment driving device determines an optimal anti-phase gain parameter through the power detection signal and directly adjusts the laser. The system has the advantages of simple and stable structure, quick response and easy parameter adjustment, the reference voltage is used as the reference voltage in the method, the power stability effect can be effectively improved, an open-loop control structure is used, the stability effect better than that of closed-loop control can be achieved, and the system is suitable for large-scale popularization and application. And finally, optimal parameters can be determined, so that the system adapts to changes of an external environment and can be applied to the fields of precision measurement and laser precision machining.

The invention provides a device and a method for generating a Lammer-type hot atomic beam light clock based on periodic pulses. The device comprises a pulse laser, a laser frequency stabilization system, an optical switch, a Laammer type hot atom chamber and a laser detection feedback system. Wherein the pulse laser is used for emitting first laser, and the pulse time is nanosecond magnitude. The laser frequency stabilization system is used for carrying out pre-frequency stabilization on the first laser to obtain second laser, and the second laser is conveyed to the Laammer type hot atom chamber through the optical switch; the switching period of the optical switch is set to be microsecond magnitude; the lamplug type hot atom chamber is used for outputting a lamplug type hot first atom beam; and the laser detection feedback system is used for detecting the first atomic beam, feeding back and controlling the pulse laser, locking the frequency of the pulse laser on a transition spectral line of atoms, and obtaining a hot atomic beam light clock. According to the invention, the interaction time of laser and atoms can be controlled, and the utilization rate of the atoms of the Lammer-type hot atomic beam light clock can be improved.

The invention provides a spectral analysis line screening method and system, and the method comprises the steps: collecting a plasma spectrum based on a laser probe, taking the plasma spectrum as an original spectrum, calculating a corresponding average spectrum, and carrying out the spectrum peak recognition of the average spectrum through wavelet transformation; extracting predetermined features of spectrum peaks from the original spectrum, and performing classified scanning on each spectrum peak based on the predetermined features of the spectrum peaks; the classified scanning results form a column vector matrix, and an accumulated correlation coefficient between column phasors in the column vector matrix is calculated; arranging the accumulative correlation coefficients in an ascending order, and selecting spectrum peaks corresponding to the accumulative correlation coefficients which are ranked in the front as analysis line clusters; extracting predetermined features of the analysis line cluster from the original data, and constructing a multi-spectral peak classification model through a machine learning algorithm based on the features of the analysis line cluster; and screening the spectral analysis lines to be identified through the multi-spectral peak classification model. Through the scheme, the dimension of the spectral peak feature vector can be reduced, the model data volume is reduced, the analysis line screening efficiency is improved, and the classification accuracy is guaranteed.

The invention relates to the field of laser water depth detection, in particular to a water surface fluctuation compensation method for laser sounding, and solves the problems of insufficient precision and water surface fluctuation interference in a traditional sounding technology in an extremely shallow water area. The measured water depth is corrected through the turbidity sensor, the IMU zero offset compensation sensor and the laser displacement sensor, and the purpose of improving the measurement accuracy is achieved. According to the scheme, the stability and precision of depth sounding of the extremely shallow water area are remarkably improved, and the method has high environmental adaptability and wide application prospects.

The invention relates to the field of laser detection, in particular to a sample mechanism for marine corrosion primary process detection, which comprises a sample box, a sample loading device for placing a sample plate is arranged in the sample box, and one side of the sample box is provided with an excitation interface and a detection interface. The upper portion of the communication port is connected with a three-way connector, the other two connectors of the three-way connector are used for air exhaust and water dripping respectively, the connector for air exhaust is connected with a vacuumizing pump, and the connector for water dripping is matched with a plugging cover. And the water dripping joint is connected with a water dripping pipe matched with a sample plate on the sample loading device. The communicating port is matched with the three-way joint, so that the vacuumizing operation can be completed through the communicating port, and meanwhile, the dripping operation can also be completed, so that the sample plate simulates a sample environment in which seawater is immersed, and a more accurate detection effect can be obtained.

The invention discloses a design and implementation method of a near-infrared light-splitting super lens, and relates to the technical field of super lenses. The super lens is composed of a rotational symmetric structure, so that polarization insensitivity is achieved, incident broadband light can be dispersed to different positions of the same focal plane according to different wavelengths through ingenious optical design, an effective light splitting effect is achieved, and the polarization insensitivity of the super lens is improved by adjusting geometric parameters and shapes of the super lens nano structure units. The positions of light with different wavelengths on a focal plane can be accurately controlled; in the optimization process, a particle swarm optimization algorithm is adopted to reduce errors, and performance attenuation and optical distortion caused by dispersion can be effectively reduced by adjusting dispersion characteristics and geometric parameters of the nano-structure units, so that the precision and reliability of light splitting are improved, and the light splitting precision is improved. The identification capability of the laser detection system is greatly improved, and integration and miniaturization are realized.

The invention discloses ultrafast photo-thermal PCR amplification equipment and a use method. The ultrafast photo-thermal PCR amplification equipment comprises a shell, and a laser probe and an infrared temperature sensor are arranged in the shell; a chip rack is arranged in the shell, and a chip to be tested is placed in the chip rack; the laser probe is located on one side of the chip frame, the infrared temperature sensor is located on the other side of the chip frame, and the laser probe inclines upwards in the vertical direction. An embedded industrial all-in-one machine is installed on the shell, and the output end of the infrared temperature sensor is connected with the input end of the embedded industrial all-in-one machine. An excitation light source of the laser probe and a coupling non-contact infrared temperature measurement sensor can realize temperature control of nanoparticles in different batches, the ultrahigh temperature change requirement of PCR is met, infrared temperature measurement control replaces a traditional thermocouple to serve as a temperature feedback device, the phenomenon of reagent pollution caused by contact measurement is avoided, and the detection accuracy is improved. The accuracy of later data detection is ensured, and the laser probe is inclined upwards along the vertical direction, so that a PCR reaction area is fully covered.

According to the sighting telescope for detecting the unmanned aerial vehicle and the control method of the sighting telescope, a view field area is scanned mainly through active narrow-band near-infrared laser, remote detection and discovery of peeping photoelectric equipment of the unmanned aerial vehicle can be achieved, and the sighting telescope is small in system size and low in cost. According to the main technical scheme, the sighting telescope of the detection unmanned aerial vehicle is characterized in that a laser emitting module is used for emitting detection laser; the imaging assembly is used for acquiring image information; the main control module is connected with the laser emitting module, the imaging assembly and the display module, the main control module is used for controlling the laser emitting module to emit laser and extracting unmanned aerial vehicle information according to the image information, and the display module is used for displaying according to the image information and the unmanned aerial vehicle information. The invention is mainly used for laser detection.

The invention relates to a laser detector suitable for a strong sunlight environment and a preparation method thereof, and belongs to the field of photoelectric detectors. The laser detector comprises a first sub-detector and a second sub-detector which are opposite in polarity, the first sub-detector is used for detecting sunlight and laser signals, the second sub-detector is used for detecting sunlight signals, and the first sub-detector and the second sub-detector eliminate sunlight interference by outputting sunlight current signals which are equal in magnitude and opposite in direction. The detector further comprises a first electrode, a second electrode and a third electrode, the third electrode is connected with the first sub-detector and the second sub-detector, the first electrode is connected with the first sub-detector, and the second electrode is connected with the second sub-detector. And the polarities of voltages connected to the first electrode and the second electrode are opposite. Sunlight currents generated by the two sub-detectors are basically consistent to offset each other, and only small light currents generated by laser signals are output, so that the detector can maintain the optimal working voltage.

The invention relates to the technical field of laser measuring instruments, and discloses a device for measuring roadway roof separation by laser, which comprises a roadway roof, a laser probe, a first threaded pipe, a second threaded pipe and a mounting mechanism, and is characterized in that the laser probe is mounted on the first threaded pipe and is connected with a cable; the mounting mechanism is used for mounting the second threaded pipe on the first threaded pipe; the mounting mechanism comprises a base arranged on the roadway top plate, a rotating mechanism and a lifting mechanism are arranged on the base, and the lifting mechanism is used for feeding the laser probe, the first threaded pipe and the second threaded pipe into drill holes formed in the roadway top plate. The device for laser measurement of roadway roof separation overcomes the defects that in the prior art, equipment is large in occupied area and depends on the stability of a bottom plate, and the measurement precision is prone to being interfered, and the roof separation measurement device is more efficient, more accurate and more suitable for the underground complex environment.

To measure the temperature of sample gas, such as combustion gas in a combustion furnace or exhaust gas flowing in a flue without using a thermocouple, and accurately measure the concentration of a gas component included in the sample gas.SOLUTION: A gas measuring device comprises: a laser beam source that irradiates sample gas with a laser beam; a photo detector that detects the laser beam transmitted through the sample gas; a radiation thermometer in which a temperature measuring direction is provided along an optical path of the laser beam; and a signal processing unit that calculates the concentration of a gas component included in the sample gas on the basis of a light intensity signal obtained from the photo detector and a temperature signal obtained from the radiation thermometer.SELECTED DRAWING: Figure 1

The invention provides a multi-target photoelectric laser detection system and a multi-target photoelectric laser detection method. The multi-target photoelectric laser detection system comprises a laser detector, a photoelectric detector and a scanning swing mirror, the photoelectric detector comprises a visible light detector and an infrared detector; the scanning oscillating mirror is mounted at the front end of the laser measuring and illuminating device; the photoelectric detector sends detected position information of a target to the laser detector and the scanning swing mirror, and the scanning swing mirror deflects according to the position information so as to adjust the optical axis of the laser detector. The multi-target photoelectric laser detection system of the scheme has the functions of auxiliary illumination, tracking distance measurement and searching distance measurement at the same time.

The invention discloses an anti-resonance hollow-core waveguide photo-thermal spectrum gas sensor, and relates to an optical gas sensor. The laser comprises pump laser (1), detection laser (2), an input optical fiber (3), a hollow-core anti-resonance optical fiber (4), an output optical fiber (5) and a photoelectric detector (6), the pump laser (1) and the detection laser (2) are combined through a coupler and are coupled to an air core of the hollow-core anti-resonance optical fiber (4) through the input optical fiber (3); the input optical fiber (3), the hollow-core anti-resonance optical fiber (4), the output optical fiber (5) and the photoelectric detector (6) are connected in sequence; and the hollow-core anti-resonance optical fiber (4) comprises a waveguide gas chamber (4-0), a gas inlet (4-1) and a gas outlet (4-2). The optical phase demodulation is realized by utilizing an anti-resonance reflected light waveguide mechanism, an external interference phase demodulation structure is not needed, the system is simple, the cost is low, and the response speed is high.

The invention discloses a laser hoisting positioning frame. An inserting frame body is arranged at the lower position of hoisting equipment; the multiple groups of inserting pipes are arranged at intervals in the length direction of the inserting frame body, and the inserting pipes are used for combining steel bars at the upper end of a wall body; the adjusting frame is arranged above the inserting frame body and is used for adjusting the levelness of the inserting frame body; the driving unit is used for driving the inserting pipe to be inserted and fixed with or separated from the wall upper end reinforcing steel bar; the laser detection head is installed on the inserting frame body and used for measuring coordinate information of a wall, the laser detection head transmits detected coordinate signals to the central control unit, the central control unit is used for controlling the adjusting frame to adjust the levelness of the inserting frame body, and the levelness of the wall is adjusted by adjusting the levelness of the inserting frame body. The wall to be installed and the installed wall are aligned, it is ensured that the steel bars are aligned with the preformed holes, accurate installation of the wall can be ensured, the installation efficiency of the fabricated prefabricated wall can be improved, and the construction quality can be ensured.

A system and method are provided for characterizing a laser using a diffraction grating. The system includes a lens that projects diffraction patterns from the diffraction grating as an image of diffraction peaks onto a plane. Optical sensors then sense the diffraction peaks. A processor connected to the optical sensors applies the laser characterization method to determine the laser wavelength, irradiance and angle of incidence. In the method, the processor obtains the diffraction peak measurements from the optical sensors and applies a transform to arrange the diffraction peaks into a grid of regularly spaced peaks. The processor then applies convolution kernels to analyze the grid of regularized peaks to determine a wavelength, irradiance and angle of incidence of the laser.

The invention provides a low-interference drainage pipeline defect and state automatic detection device and method, and relates to the technical field of defect detection.The low-interference drainage pipeline defect and state automatic detection device comprises an inspection detection system and two fixed detection systems, and each fixed detection system comprises a semicircular-arc-shaped pipe wall fixing structure, a fixed detection transmission control system and a plurality of first laser probes; the fixed detection transmission control system is installed on the pipe wall fixing structure, the multiple first laser probes are installed at different positions of the pipe wall fixing structure respectively, and the multiple first laser probes are connected with the fixed detection transmission control system; the inspection detection system comprises an inspection track and an inspection robot, the inspection robot comprises an inspection robot carrier, a robot controller and a plurality of second laser probes, the plurality of second laser probes are respectively mounted at the top and the bottom of the inspection robot carrier, and the inspection robot carrier moves along the lower surface of the inspection track in a hoisting manner. According to the invention, various defects can be detected when the drainage pipeline is in normal operation and drainage.

The invention provides a data processing method of a laser radar and a laser detection system. The data processing method comprises the following steps: S11, acquiring a frame of point cloud data of the laser radar; s12, determining a set of ground points in the frame of point cloud data; and S13, determining calibration parameters of the laser radar point cloud according to the set of ground points. In the embodiment of the invention, after the ground point set is extracted by using the GPU, the point cloud ground level is calibrated at a high speed, so that the radar 3D point cloud ground is aligned with the ground level of the physical world. According to the embodiment of the invention, the ground point in the 3D point cloud can be quickly obtained, the ground point is drawn by using the GPU, and the laser radar point cloud calibration parameter is obtained by using the projection of the ground point in the preset plane, so that the point cloud of the laser radar can be calibrated to be close to a world coordinate system and be basically aligned with the horizontal plane under the world coordinate system.

The invention provides a field-free on-orbit calibration method for a spaceborne photon counting laser radar, and relates to the technical field of spaceborne photon counting laser radars. According to the method, combined registration is carried out on a high-precision airborne laser point cloud and a high-resolution optical remote sensing image, and the plane positioning precision of the airborne laser point cloud is firstly improved by combining the plane positioning advantage of the high-resolution optical remote sensing image and the elevation precision advantage of the airborne laser point cloud; and the satellite-borne photon counting point cloud is matched with the corrected airborne laser point cloud, and the pointing error and the system ranging error of the satellite-borne photon counting laser radar are corrected, so that the field-free in-orbit geometric calibration of the satellite-borne photon counting laser radar is realized. According to the method, dependence on a ground calibration field laser detector is avoided, the method has the advantages of being high in adaptability, high in calibration precision and wide in application range, and a new technical means is provided for improving field-free on-orbit calibration of a spaceborne photon counting laser radar height measurement system.