28 results about "Laser remote sensing" patented technology

The invention provides a gas detection method based on galvanometer scanning, and the method comprises the following steps: obtaining a visible light image of a to-be-detected region collected by a visible light imaging module, processing the visible light image based on a pre-trained semantic segmentation model, and obtaining a background category matrix; acquiring gas concentration information of each scanning point obtained by scanning the to-be-detected area by the galvanometer laser telemetering assembly, wherein the galvanometer laser telemetering assembly is registered with the visible light imaging module in advance; and acquiring a background category corresponding to each scanning point according to the background category matrix, and correcting a gas concentration signal of the point based on a background correction coefficient associated with the background category. According to the gas detection method, the problems of false detection and the like caused by factors such as unknown background reflectors and unknown detection object types in the existing galvanometer scanning gas detection are effectively solved, and the accuracy of gas concentration detection is improved.

The application discloses a method for inverting marine aerosol optical depth by using spaceborne lidar noise, belongs to the technical field of laser remote sensing, and is used for quantitatively inverting aerosol optical depth. Under the premise that system hardware parameters of the spaceborne lidar and total background noise data detected by the spaceborne lidar, environmental parameters of a corresponding region and moment are given, a noise model of solar radiation items corresponding to water surface white froth diffuse reflection and water surface specular reflection, a water-leaving noise model (a noise model of solar radiation items of water body backscattering), and an atmospheric noise model (a noise model of solar radiation items of Rayleigh scattering of atmospheric molecules and Mie scattering of aerosol particles) are respectively constructed. Water surface noise, water-leaving noise and atmospheric Rayleigh scattering noise are removed from total noise rate of the atmosphere top detected by the lidar, and aerosol scattering noise results are obtained. Finally, marine aerosol optical depth of a satellite transit region and moment is quantitatively inverted by using the aerosol scattering noise results and the aerosol scattering noise model.

The invention relates to a space laser radar forest structure data correction method and system, and belongs to the technical field of space laser remote sensing and forest resource monitoring. Aiming at four kinds of errors of geometric positioning offset, slow distortion, terrain broadening effect and canopy structure influence of GEDI data, UAV control points are arranged by adopting a hierarchical arrangement strategy, a homonymy point relation is established through waveform registration, and weights are calculated; performing overall geometric correction based on the regular grid control points; carrying out local distortion correction based on the encryption control point; establishing a physical compensation model to compensate the terrain broadening effect; based on the canopy structure parameters and GEDI signal quality indexes, establishing a statistical regression model to correct a canopy height residual error; and finally, obtaining a high-precision canopy height convergence result through spatial smoothing processing, and outputting corrected data. The method achieves step-by-step precision improvement from the whole domain to the local domain and from the geometry to the height, and is low in cost, high in precision and wide in application range.

1. The name of the design product: the main body of the laser wind measuring instrument. 2. The use of the design product: the main body and the whole can be used as a laser remote sensing wind measuring device, installed at the top of the nacelle of a wind turbine generator. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1. 5. Other circumstances that need to be explained: the solid line in the view defines the part claimed, and the dashed line defines the part not claimed.

The method for quickly inverting aircraft wake vortex parameters based on mobile platform laser remote sensing comprises the following steps: a laser radar system scans a wake vortex influence area, and measurement data are subjected to quality control processing; a wake vortex core position and a vortex core radius are estimated; a wind speed of an arbitrary measurement point A located in the wake vortex range is subjected to vector decomposition, and the wind speed is expressed as a function of a wake vortex circulation parameter W 、 V 、 U A background wind speed and a laser radar motion speed are eliminated by using a non-wake vortex area measurement point; a difference between radial velocities of two measurement points in and out of a wake vortex influence range in the same laser emission direction is expressed as a function of a wake vortex circulation; and a turbulent disturbance is weakened by multiple measurements in the wake vortex influence range, and then a least square method is used to fit and solve the wake vortex circulation. The present application can accurately invert and correct aircraft wake vortex parameters by using less observation data. The calculation result is fast and accurate, and can provide scientific and reliable data support for aviation safety and aircraft cooperative operation.

The invention discloses a frequency discrimination curve calibration system, method and device, and relates to the technical field of laser remote sensing, the system locks the output laser frequency of a first laser on a low-concentration atom or molecule absorption peak to obtain an accurate frequency standard; the laser output by the second laser device and the laser output by the first laser device are subjected to beam combination beat frequency, a frequency difference is extracted from a beat frequency signal power spectrum to generate a tuning control signal of the second laser device, and the output laser frequency of the second laser device is locked at any preset frequency offset; the whole laser radar system utilizes an electric control optical switch to realize conversion between a calibration state and a detection state: in the calibration state, laser from the second laser is gated for frequency discrimination curve calibration; and in a detection state, gating the received atmospheric echo signal light for atmospheric remote sensing detection. Therefore, on the basis of ensuring the calibration precision and stability of the frequency discrimination curve, the calibration cost of the frequency discrimination curve is reduced, and the calibration efficiency of the frequency discrimination curve is improved.

This observation system includes a laser beam guidance device (18) and a laser remote sensing device (8) configured to perform a range measurement on a range segment (12). The guidance device (18) is configured to redirect a laser beam emitted onto the range segment (12) and direct it along a plurality of directions from an observation plane of the observation system. The guidance device (18) includes at least one movable mirror (32) rotating about itself, configured to direct said laser beam along said plurality of directions. An axis of rotation of said movable mirror (32) and a longitudinal axis of said range segment are non-parallel and non-orthogonal. Figure for the abbreviation: Fig 6

A kind of indoor fire flashover risk prediction method based on flame shape and remote sensing data, steps include: using fire simulation simulation software to simulate fire data, construct fire data set;Ignition is carried out, the indoor fire flame image is obtained by high-definition camera, and the obtained image is processed;The real-time heat release rate HRR of ignition point is output by residual network Resnet model after processing image;Real-time monitoring and acquisition of indoor specific height smoke layer methane gas concentration data are carried out using methane laser remote sensing detector;Based on heat release rate and methane gas concentration, fire flashover risk prediction model is built, and flashover risk is predicted in advance.The present application realizes accurate identification and prediction of flashover risk of fire in early stage of fire development, and sends early warning signal when fire is about to enter flashover stage, reduces personnel casualties and property losses caused by fire.

This invention discloses a blind-zone-free laser remote sensing system for stable boundary layer thermal material structures. The system includes a lateral scanning Raman scattering lidar receiving system with multiple lateral receiving systems, a lidar transmitting system, and a backscattering Raman scattering lidar receiving system. The lateral receiving system receives near-surface nitrogen and water vapor Raman signals and aerosol Mie-Rayleigh scattering signals, filling the detection blind zone of the backscattering lidar. The backscattering system detects signals in the upper atmosphere. The invention also discloses a blind-zone-free laser remote sensing method for stable boundary layer thermal material structures, which utilizes the lateral and backscattering systems for collaborative observation, respectively retrieving the water vapor mixing ratio, temperature, and aerosol extinction coefficient near the ground and in the upper atmosphere, and fusing them through a data stitching algorithm to obtain a blind-zone-free profile of the entire layer. This method enables refined detection of the entire layer from the ground to the upper atmosphere, continuously, with full parameters, and high spatiotemporal resolution.

Embodiments of the present application disclose a gas leakage risk simulation method and device based on laser remote sensing and a medium. The method comprises: dividing a region to be simulated into a plurality of two-dimensional geographic grids; using a laser remote sensing device to monitor the concentration of gas pollutants in a plurality of monitoring grids in the region to be simulated in real time, wherein the laser remote sensing device is arranged at a high position of a leakage risk region boundary in the region to be simulated, and a monitoring angle covers a leakage risk device and surrounding grids in the leakage risk region; monitoring grids with an instantaneous increment of pollutant concentration greater than a set positive threshold are identified as suspected leakage grids and added as leakage sources in an atmospheric diffusion simulation model, and a minute-level or higher time-precision simulation is performed on the pollutant leakage process of the leakage sources. The embodiments can capture leakage events in a larger range in real time and dynamically simulate diffusion paths.

The application discloses a multi-channel laser sensor inter-channel angle error flight calibration method, device and equipment and a computer readable storage medium, and belongs to the technical field of unmanned aerial vehicle laser remote sensing. The method comprises the following steps: calibrating and splitting obtained point cloud data files to obtain channel point cloud data files; determining feature surface patches and reference surface patches based on channel point cloud data in the channel point cloud data files, wherein the reference surface patches are feature surface patches corresponding to middle channels; calculating channel angle errors of each channel according to distances from feature points on the feature surface patches to reference points on the reference surface patches, and determining angle error calibration results based on the channel angle errors and theoretical errors. In this way, angle error calibration is performed on each channel of the multi-channel laser sensor, and the precision of the multi-channel laser sensor is improved.

The invention relates to a composite toxic gas laser telemetering equipment performance test system and method, which is characterized in that a control center is arranged outside a composite toxic gas laser telemetering test environment, and a mobile gas measurement point and N gas measurement points are arranged in the composite toxic gas laser telemetering test environment, information data interaction between the movable gas measurement point locations and the gas measurement point locations is realized through wireless signals and the control center. According to the invention, by setting a plurality of gas measurement point locations, including a movable point location and N fixed points, and combining wireless communication and automatic control technologies, collection and transmission of composite toxic gas data can be completed without manual close-range operation, and information processing is carried out based on hardware characteristics of two types of measurement point locations, so that the measurement accuracy is improved. And data transmission reliability is introduced into model fusion weight calculation, so that the credibility of a fusion result is improved.

The application discloses a laser air speed tube device based on Rayleigh scattering laser radar and belongs to the field of laser remote sensing, which comprises an outgoing light path composed of a pulsed fiber laser, a first beam splitter, a beam expander and a launching barrel; a receiving light path comprising an arranged telescopic receiving system, a 2*1 polarization maintaining fiber coupler, a collimating lens, a narrowband interference filter, a polarization beam splitter prism and an F-P etalon, one output of the F-P etalon being provided with a first focusing lens, a second beam splitter and a first signal channel detector, and the other output of the F-P etalon being provided with a third focusing lens, a third beam splitter and a first signal channel detector; and a close-range signal detection light path comprising a common receiving section light path between the 2*1 polarization maintaining fiber coupler of the receiving light path and the second beam splitter and the third beam splitter; the first focusing lens is arranged between the first beam splitter beam splitting light path and the 2*1 polarization maintaining fiber coupler; and the first and second close-range signal detectors are arranged at the rear of the second and third beam splitting light paths respectively.

The application discloses a laser remote sensing type road surface state measuring system and a measuring method, the measuring system comprises an optical measuring module, the optical measuring module is used for emitting measuring light of a specific wavelength to irradiate a road surface target object and can receive reflected light reflected by the road surface target object; a weak signal detection module, the weak signal detection module is used for signal processing of an electric signal converted by the received reflected light reflected by the road surface target object; and a digital signal processing module, the digital signal processing module is used for processing of the electric signal after signal processing. The application obtains a road surface spectrum signal through the optical measuring module, and through signal processing of the weak signal detection module and the digital signal processing module, road surface states are recognized, and snow, ice or water film thickness of the road surface is measured.

The utility model discloses a binocular laser telemetering module, comprising a main body, the main body is provided with a first mounting hole and two second mounting holes located at two sides of the first mounting hole, the second mounting holes are inverted conical holes, the small hole end of each second mounting hole is provided with a receiver, and the receiver is provided with a camera. The large hole end of the second installation hole is provided with a light condensation assembly. A laser transmitter is mounted in the first mounting hole, a cover body is detachably mounted on the main body, and the cover body is used for covering the receiver and the laser transmitter; according to the invention, the structure of one-transmitting and two-receiving is realized, more and weaker optical signals can be superposed and received in a short time, the received weaker optical signals can be processed more accurately, further, concentration detection in a longer distance is realized, and the detection accuracy is improved.

The application discloses a kind of laser remote sensing two-dimensional scanning imaging device and method thereof, it is related to gas spectrum detection field.The concentration field measurement of scene is realized by two-dimensional intermittent scanning, can realize the quick leak diagnosis, evaluation and the quick positioning of leak point;During concentration measurement process, laser spot is static, and motion noise is not introduced, the accuracy of concentration measurement is improved;Intermittent movement of spot is realized using optical modulation, without complex intermittent motion mechanism, more economical in cost, longer service life;Without mechanical scanning device frequently start-stop in two-dimensional scanning process, reduce the time consumption brought by motion acceleration and deceleration process, improve the frame rate of system scanning, realize the quick scanning of high dynamic gas cloud.

This invention discloses a lidar attitude measurement and positioning method and device for an airborne electromagnetic detection suspension system, belonging to the fields of airborne electromagnetic detection technology, attitude measurement, and coordinate positioning technology. This invention accurately acquires real-time spatial positioning and attitude information of an airborne soft-suspension flight pod subsystem by employing a non-contact laser remote sensing measurement method, without the need to fix attitude and positioning devices on the suspension flight pod subsystem. This avoids electromagnetic interference or dynamic stability issues caused by attitude and positioning devices and related auxiliary electronic equipment to the soft-suspension flight pod subsystem, ensuring the accuracy of electromagnetic signals and data reliability during the detection process, thereby improving the precision of airborne electromagnetic detection.

The invention relates to a reduced scale model wind turbine inlet wind field observation and reconstruction method based on a laser radar, and the method is characterized in that the method comprises the following steps: S1, carrying out the discretization of a reduced scale model wind turbine scanning round surface, forming finite calculation points, and calculating the average wind speed spectrum of an impeller; s2, obtaining an average wind speed self-spectrum of the impeller; s3, calculating a cross spectrum between the impeller average wind speed spectrum and the impeller average wind speed self-spectrum; s4, calculating coherence between the average wind speed observed by the laser radar and the actual average wind speed of the impeller, and calculating an optimal scanning cone angle and a focusing position by adopting an optimization algorithm; s5, acquiring a vertical wind profile of the wind field; and S6, calculating a reconstructed wind field. According to the method, the laser remote sensing technology is adopted, and the physical acting force generated after the laser and the aerosol act can be ignored, so that the interference and wake flow effect on a flow field due to the existence of a relatively large physical structure in a traditional wind measurement method do not exist.

The invention discloses an atmosphere multi-parameter synchronous inversion method and system, and belongs to the technical field of atmosphere laser remote sensing. Probe light and reference light are obtained through laser pulse beam splitting; the probe light is vertically emitted into the atmosphere after being subjected to beam expansion and then is scattered by the atmosphere to obtain echo light; namely, all parameters are from the same measurement and the same spectrum, the data space-time consistency is perfect, the measurement mode is efficient, and the measurement result is accurate. And calculating a temperature parameter and a pressure parameter in the atmosphere by using the normalized scattered spectrum so as to obtain an aerosol parameter and a wind speed parameter, so that true synchronous inversion of four key parameters, namely temperature, pressure, wind speed and aerosol is realized for the first time. Besides, in applications such as meteorological prediction, synchronous measurement of atmospheric temperature, pressure, wind speed and aerosol is realized, the cost can be saved, the efficiency can be improved, and the method has important practical significance.

The present application relates to a space laser radar forest structure data correction method and system, and belongs to the technical field of space laser remote sensing and forest resource monitoring. In view of the four types of errors of GEDI data, such as geometric positioning deviation, slow variation distortion, terrain widening effect and crown structure influence, the present application adopts hierarchical layout strategy to layout UAV control points, establishes the same point relationship through waveform registration and calculates the weight; based on the regular grid control points, the overall geometric correction is carried out; based on the encryption control points, the local distortion correction is carried out; the physical compensation model is established to compensate the terrain widening effect; the statistical regression model is established based on the crown structure parameters and GEDI signal quality index to correct the crown height residual error; finally, the high-precision crown height convergence result is obtained through spatial smoothing processing, and the corrected data is output. The present application realizes the gradual accuracy improvement from the whole to the local and from the geometry to the height, has low cost, high precision and wide application range.

The invention relates to a DMD-based field-of-view adjustable laser radar geometric factor correction method, and belongs to the technical field of laser remote sensing. Establishing a laser radar system; the light path switching mechanism is opened; the laser emits pulse laser to the atmosphere to generate laser echoes scattered by the atmosphere; after entering the telescope, the laser sequentially passes through the DMD, the collimating mirror, the reflecting mirror and the imaging mirror to reach the imaging detector; the view field controller realizes deflection of a micromirror on the DMD according to the atmospheric echo image; closing the light path switching mechanism; after entering the telescope, laser echoes sequentially pass through the DMD, the collimating mirror, the reflecting mirror, the light path switching mechanism, the narrow-band optical filter and the focusing mirror to reach the echo detector; geometric factor calibration is carried out on the laser radar system; through the DMD and echo pattern monitoring, the laser radar receiving view field can be accurately matched with the laser echo projection, so that the background light noise is suppressed, the low-layer blind area is compressed, and the low-layer atmosphere accurate measurement capability is improved.

This invention relates to a method for determining wind speed components using a placed LiDAR sensor (1). In this method, the wind speed components are first approximated (APP) using signals from the LiDAR sensor, and these approximations are used in a wind signal model (MOD) and then in a non-static Kalman filter (KAL) to construct a filtered measurement signal. The filtered measurement signal is then used to reconstruct (REC) the wind speed components.

1. The name of the design product: unmanned aerial vehicle laser remote sensing module. 2. The use of the design product: for adapting unmanned aerial vehicles and other platforms, and measuring the concentration of target gas on the platform by laser. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

An aircraft trailing vortex parameter rapid inversion method based on mobile platform laser remote sensing comprises the steps that a laser radar system scans a trailing vortex influence area, and measurement data is subjected to quality control processing; estimating the position and radius of the vortex core of the trailing vortex of the aircraft; performing vector decomposition on the wind speed of any measurement point A in the trailing vortex range, and representing the wind speeds W, V and U through parameters such as trailing vortex circular rector; eliminating the influence of background wind speed and laser radar movement speed by using a non-trailing vortex region measurement point; the difference of the radial speeds of the two measuring points inside and outside the trailing vortex influence range in the same laser emission direction is expressed as a trailing vortex circular rector function; the influence of turbulence disturbance is weakened through multiple times of measurement within the trailing vortex influence range, and then the trailing vortex circular rector is solved through least square fitting. According to the method, accurate inversion and correction of the trailing vortex parameters of the aircraft can be realized through less observation data. The calculation result is fast and accurate, and scientific and reliable data support can be provided for aviation safety and aircraft collaborative operation.

The invention discloses a water vapor column concentration laser telemetering system and method based on TDLAS-WMS. The system comprises an electronics control unit, a laser modulator, a near-infrared laser, a collimator, a dichroscope, a first reflector, a second reflector, an optical convergence telescope, a narrow-band filter, a detector, a ranging radar and a visible light laser. According to the invention, the TDLAS-WMS-2f / 1f technology is used, and high-precision and high-stability water vapor column concentration measurement is realized. The tunable semiconductor laser absorption spectrum is combined with the wavelength modulation spectrum technology, signal processing is carried out according to the ratio of second harmonics to first harmonics, and interference caused by light intensity fluctuation, atmospheric turbulence and non-absorption loss in the light path transmission process can be effectively eliminated.

The invention relates to an integrated nanosecond light source based on a photoelectric chip, which mainly uses an SOA chopping technology, uses SOA cascade chopping to replace a traditional EOM and AOM cascade structure, and comprises a DFB light source, a chopping module 1, a chopping module 2 and a collimator. Based on a photoelectric hybrid packaging process, the DFB chip and the SOA chip are integrated on one substrate, and high-density integration is realized. The pulse light source can be applied to optical fiber sensing, laser remote sensing, Doppler wind lidar and other systems, high-quality narrow-linewidth, narrow-pulse-width and high-extinction-ratio pulse light output can be greatly achieved, and power consumption and cost of the light source are reduced.

The invention discloses an optical parametric oscillation amplifier with wide tuning, large energy and high light beam quality. The optical parametric oscillation amplifier comprises a 1064nm pumping source, a light beam regulating and shaping module, an optical parametric oscillator and an optical parametric amplifier. The regulation and shaping module realizes independent and accurate regulation of total energy of pump light and splitting ratios of two paths leading to an oscillator and an amplifier through combination of at least two sets of half-wave plates and a polarization beam splitter; the optical parametric oscillator comprises two nonlinear crystals which are placed in a plane-plane resonant cavity in a walk-off compensation mode and are used for generating tunable seed light; and the optical parameter amplifier receives the seed light and the other path of pump light, and amplifies the seed light by using two amplification crystals placed in a walk-off compensation mode. Through the specific structure, the problem that wide tuning, large energy and high beam quality are difficult to consider at the same time is solved, high-precision continuous tuning can be achieved in the human eye safe wave band of 1535-1578 nm, large-energy and high-beam-quality laser output is obtained, and the laser is suitable for the fields of laser remote sensing, laser radar and the like.

The application discloses a frequency discrimination curve calibration system, method and device, and relates to the technical field of laser remote sensing. The system locks the output laser frequency of a first laser on an atom or molecule absorption peak with low concentration, and obtains an accurate frequency standard. The output laser of a second laser is combined with the output laser of the first laser to generate a tuning control signal of the second laser from a frequency difference extracted from a power spectrum of a beat frequency signal, and the output laser frequency of the second laser is locked at any preset frequency offset. The whole laser radar system uses an electrically controlled optical switch to realize the conversion between a calibration state and a detection state. In the calibration state, the laser from the second laser is selected to calibrate the frequency discrimination curve. In the detection state, the received atmospheric backwave signal light is selected for atmospheric remote sensing detection. Therefore, the calibration cost of the frequency discrimination curve is reduced, and the calibration efficiency of the frequency discrimination curve is improved on the basis of ensuring the calibration accuracy and stability of the frequency discrimination curve.