331 results about "Laser intensity" patented technology

The invention relates to the field of gravity measurement, and aims to provide a small-size high-precision gravimeter based on an anti-magnetic suspension principle. The gravimeter comprises a low-frequency magnetic potential well unit, a suspension mechanical oscillator unit, a displacement detection unit and a cavity enclosing unit, and lens groups of the low-frequency magnetic potential well unit, the suspension mechanical oscillator unit and the displacement detection unit are all located in a cavity of a heat preservation shell on the innermost side. According to the invention, a measurement environment without external influence can be provided for the displacement detection of the suspension oscillator, the adjustment of the frequency in the vertical direction in a magnetic suspension potential well is resisted, the movement of an object to be measured is reflected by the voltage fluctuation brought by the laser intensity change measured by the photoelectric converter, and the high-precision gravity measurement is realized; the vibrator adopts a magnetic suspension mode and does not make mechanical contact with the environment, and long-term irreversible deformation can be avoided; and a temperature control and magnetic shielding device or other auxiliary equipment with a large volume is not needed, so that the gravimeter is small in overall size, convenient to move, low in cost and beneficial to popularization.

The invention discloses a LiDAR-IMU-camera tight coupling positioning and mapping method and device for a mobile platform, and belongs to the technical field of robot SLAM. Synchronously triggering the color camera, the laser radar and the IMU through hardware, and unifying timestamps; performing compensation and distortion removal on the laser point cloud motion by the IMU data; based on curvature, intensity and density self-adaptive downsampling, local plane fitting errors are used for distributing observation weights; the IMU pre-integration pose is used as an initial value, point-to-surface registration of the weighted point cloud and the local map is carried out, and a laser-IMU tight coupling odometer factor is obtained; the color image and the laser intensity graph are fused into a multi-mode loopback descriptor, and loopback factors are generated through global retrieval and geometric verification; and inputting an odometer, an IMU, a laser loopback factor and a visual loopback factor into an increment factor graph optimizer, jointly solving a global optimal key frame pose, and outputting a dense laser point cloud map and a color visual point cloud map. The method can be operated in real time on an embedded platform, effectively inhibits drifting, and realizes centimeter-level global consistent positioning and mapping.

The invention relates to the technical field of laser measurement, in particular to a structure deformation monitoring method, device and system based on laser ranging. The method comprises the following steps: analyzing the numerical distribution of current ranging data and the stability degree of local data in time sequence at each measuring point to obtain the structural stability degree of each measuring point; dividing according to the structural stability degree to obtain a structural region of the measurement point; obtaining a laser adjustment coefficient of each structural region through global position distribution and structural stability degree conditions of the structural regions; and obtaining final distance measurement data of the measurement point based on the laser adjustment coefficient for monitoring. According to the invention, by analyzing the change distribution of the current ranging data, the laser intensity is adaptively adjusted by determining the areas with similar structures so as to adapt to a more complex surface environment, and the monitoring accuracy is improved.

The invention relates to the technical field of image processing, in particular to a laser radar and camera external parameter calibration method, which comprises the following steps of: judging whether laser point cloud compactness meets requirements or not; generating a laser intensity image, a laser depth image and a laser index image, and performing image enhancement processing; processing the visual image into a visual intensity image and generating a visual depth image; estimating a depth corresponding point pair and an intensity corresponding point pair; pruning corresponding point pairs, and optimizing external parameters; deleting invisible laser point clouds under the visual angle of the camera, and generating a corrected laser intensity image, a corrected laser depth image and a corrected laser index image; the external parameters are optimized and solved from coarse to fine, and finally optimized external parameters are obtained. According to the method provided by the invention, through combination of a data accumulation evaluation criterion, an image enhancement scheme and a coarse-to-fine laser radar image correction strategy, a high-quality laser intensity image and a laser depth image can be obtained.

The invention discloses an all-optical three-dimensional scanning confocal fluorescent microscopic imaging device and an implementation method thereof. According to the invention, through a deep learning driven adaptive regulation and control method, CNN is adopted to process spatial distribution data and dynamically regulate and control a phase hologram and the light intensity and phase compensation of a laser, so that the focal point of exciting light is subjected to aberration-free axial displacement, a bidirectional parallel optical scanning track of a two-dimensional scanning system is optimized, and all-optical three-dimensional scanning is realized; lSTM and TCN are combined to obtain a time sequence dependency relationship, a laser light source, an adjustable diaphragm, an electric focus-adjustable lens and a photoelectric detector are integrally controlled, efficient synchronization and automatic operation and high-speed axial focusing adjustment are realized, errors and time sequence mismatch are eliminated, optical characteristics of different samples and environmental interference are automatically adapted, and high-quality imaging is kept. The robustness and the applicable scene range of the system are improved; the method is used for model biological embryo real-time tracking, intracellular signal molecule dynamic visualization, cell membrane protein migration and aggregation observation and intracellular organelle interaction tracking.

The invention discloses a wind tunnel PIV velocity field measurement method based on quadtree adaptive grid division, and belongs to the technical field of wind tunnel measurement. In order to solve the problem of wind tunnel PIV velocity field measurement of large gradient velocity gradient flow, a wind tunnel velocity field measurement system is built; adjusting a light path; after the mounting position of the sheet light head is determined, the laser sheet light thickness is adjusted by adjusting the lens distance in the sheet light head, the laser intensity of the double-cavity pulse laser is adjusted, and the image shooting effect is adjusted; turning on the double-cavity pulse laser and the double-frame camera, and adjusting emergent light of the first pulse laser cavity and emergent light of the second pulse laser cavity to be respectively distributed in double-frame exposure of the double-frame camera; measuring calibration parameters; acquiring a double-frame camera test image of a time sequence; calculating a displacement vector field for the processed double-frame camera test image by adopting a quadtree adaptive grid displacement vector field method; and calculating a velocity field based on the displacement vector field, the calibration coefficient and an interval between the light emitting moment of the pulse laser first cavity and the light emitting moment of the pulse laser second cavity.

The invention relates to the technical field of temperature monitoring, in particular to a welding joint temperature monitoring method in a thermoplastic composite material welding scene, which comprises the following steps: acquiring temperature data of different positions of a thermoplastic composite material in the welding scene at each acquisition moment to form a temperature image point matrix at each acquisition moment; acquiring fluctuation data of the temperature image point matrix at each temperature fluctuation moment; dividing each fluctuation data cluster of fluctuation data in the temperature image point matrix at each temperature fluctuation moment; calculating a fluctuation distribution factor at each temperature fluctuation moment; obtaining a temperature abrupt change factor of each fluctuation data cluster of the temperature image point matrix at each temperature fluctuation moment; acquiring a fluctuation abrupt change factor at each temperature fluctuation moment; acquiring the laser intensity nonuniform weight at each temperature fluctuation moment; and monitoring the temperature of the welding joint in the thermoplastic composite material welding scene based on the uneven weight of the laser intensity. The accuracy of welding joint temperature monitoring is improved.

The invention relates to the technical field of lane edge detection, and provides a multi-source feature lane edge line identification method and system based on a scoring mechanism, and the method comprises the following steps: obtaining and preprocessing road point cloud data, and obtaining road region point cloud data; the color information and the laser intensity information are fused for scoring, and the road area point cloud is processed to obtain a lane line point cloud; for the lane line point cloud, extracting boundary points based on the central main axis and the normal feature jump score to obtain an edge line of each lane line; and performing smooth fitting on the edge line of the lane line to obtain a fitted lane edge line. According to the method, the color and laser intensity double-scoring function is constructed, the intensity threshold is adaptively determined through the OTSU algorithm, and the intensity threshold and RGB color difference are subjected to weighted fusion, so that the recognition accuracy and continuity of the lane marking points are effectively improved, and the problems of extraction fracture, misrecognition and the like in a traditional method are solved.

The invention relates to a multi-pass cell cavity structure capable of realizing single-concentration standard gas rapid double-point calibration, which is characterized by comprising a laser device, a cavity mirror I with an entrance port, a cavity mirror II with an entrance port, a reflecting mirror and a detector, and the laser device, the reflecting mirror and the detector are positioned on the outer side of the cavity mirror I; the first cavity mirror and the second cavity mirror are oppositely arranged, a double-face cavity mirror is arranged between the first cavity mirror and the second cavity mirror, emitted light of the laser enters the light cavity between the first cavity mirror and the second cavity mirror from the incidence port according to the incidence angle designed by the multi-pass cell, goes back and forth in the light cavity for multiple times and then is emitted out from the incidence port, and emitted emergent light enters the detector through the reflecting mirror. The detector is used for measuring laser intensity changes. The multi-pass cell cavity is ingenious in structure, double-point calibration based on single-concentration standard gas can be achieved through the additionally-arranged double-face cavity mirror, the calibration frequency can be reduced, the calibration rate can be increased, then the standard gas for calibration can be saved subsequently, the use cost can be reduced, and the use experience can be enhanced.

The invention relates to the technical field of ultrasonic sensors, and discloses an optical fiber end face integrated micro-cavity sonic sensor which comprises a seven-core optical fiber, two light propagation waveguides, a coupling waveguide, a supporting assembly, a micro disc, a light emitter and a photoelectric detector, the two light propagation waveguides are arranged on the end face of the seven-core optical fiber, the coupling waveguide is arranged between the two light propagation waveguides, and the supporting assembly is arranged on the end face of the seven-core optical fiber. A supporting assembly is arranged on the end face of the seven-core optical fiber, a micro disc is arranged on the top of the supporting assembly, and the first fiber core and the second fiber core are connected with an external light emitter and an external photoelectric detector respectively. The wavelength of the laser output by the light emitter is locked at the linear slope of the micro-disk harmonic peak, the radius and the effective refractive index of the micro-disk are changed through the action of ultrasonic waves on the micro-disk and vibration, the harmonic peak drifts and the intensity of the output laser is changed, and then the ultrasonic waves are detected; compared with the prior art, ultrasonic waves are detected through a micro-disk resonance and laser sideband locking method, and the problem of electromagnetic interference can be effectively avoided by utilizing the optical principle.

The invention discloses an underwater navigation positioning method and system based on supercontinuum laser intensity correlation. The system comprises a master control system, a transmitting end underwater base station and a receiving end underwater carrier. The method comprises the following steps: firstly, a main control system generates a super-continuum laser signal with pseudo-random code information, the super-continuum laser signal is separated into optical signals of different wavelength channels through a light splitting module, and the optical signals are respectively sent to underwater base stations uniquely corresponding to the wavelength channels and are emitted; then the underwater carrier receives optical signals from a plurality of base stations, identifies a signal source base station according to wavelength identification, performs correlation operation with a locally copied pseudo-random code sequence, determines signal arrival time TOA and calculates a pseudo-range; and finally, resolving the three-dimensional coordinate and local clock error result of the underwater carrier by combining the pseudo-ranges, absolute positions and transmission delays of the underwater carrier and the at least four base stations. According to the invention, high-precision and high-robustness absolute positioning of the underwater environment is realized, and the reliability of long-time positioning and navigation of the underwater robot is enhanced.

The invention discloses a structured illumination obvious micro deep learning reconstruction method based on dual-supervised training. The method comprises the following steps: acquiring an original structure illumination obvious micro-super-resolution image and an original wide-field true value image under the conditions of high laser intensity and high exposure time, acquiring an original modulation wide-field image under the conditions of low laser intensity and short exposure in the same visual field, and performing image enhancement to obtain a training data set; generating a point spread function of the system according to imaging use parameters, and constructing a neural network for structured illumination obvious micro-reconstruction; performing gradient descent training on the neural network of the structured illumination obvious micro-reconstruction by using a dual-supervision form based on the structured illumination obvious micro-super-resolution image and the wide-field truth value image; according to the method, the performance of deep learning reconstruction of the structured light super-resolution microscopic image can be further improved; the method is applied to image reconstruction of mainstream structured light illumination microscopes such as stripe modulation structured light illumination microscopes and lattice modulation structured light illumination microscopes.

The invention relates to the technical field of laser cutting control, in particular to a laser machining method, device, equipment and system for a metal workpiece. According to the method, the reference cutting speed and the laser power range of a to-be-machined metal workpiece are counted in historical cutting data of a machined workpiece which is already machined. And according to the distribution volatility and the change degree of the scattering laser intensity, the processing low-quality degree of the current workpiece can be effectively quantified. The metal overheating probability is further obtained based on the workpiece surface temperature. And then the laser power adjustment direction in the current state can be determined according to the metal overheating probability, and power self-adaptive adjustment in the laser cutting process can be achieved by combining the power adjustment amount obtained by machining the low-quality degree. The quality state of the metal workpiece in the laser cutting process is monitored in real time, the laser cutting parameters are adjusted in a self-adaptive mode according to the quality state, and the cutting quality of the metal workpiece is guaranteed.

The invention discloses a single molecule positioning method based on high-speed phase-locked detection, which can perform high-precision single molecule positioning and imaging on a fluorescent sample under the condition of using a single laser light source. Molecular excitation of a sub-diffraction limit region is generated by using nonlinear characteristics of excitation and fluorescence emission when a fluorescence sample is excited by laser, and meanwhile, positioning information is obtained by surrounding a single molecule of a region of interest by using an illumination light beam; and the laser intensity is continuously improved, and the positioning precision is also improved until sub-five-nanometer precision information is obtained. And the detection end adopts a high-speed lock-in amplifier to lock fluorescence signal information of characteristic frequency in real time, and meanwhile, the final signal-to-background ratio is also improved. Compared with traditional high-precision positioning based on double laser light sources, the method has the advantages of a single laser light source, does not need special fluorescent dye, does not need special matching between double-wavelength lasers, and has universality; and the damage caused by phototoxicity and photobleaching due to over-high illumination intensity is avoided.

The invention relates to a laser crystal non-radiative decay life measurement method based on relaxation oscillation frequency analysis of a solid laser, which comprises the following core steps of: firstly, acquiring a laser intensity noise spectrum in real time by adopting a self-zero beat noise detection device (2) in a stable operation state of the solid laser (1); obtaining a relaxation oscillation frequency measured value of the laser through spectral line feature analysis; secondly, a relaxation oscillation frequency theoretical model is built based on a laser rate equation, and a theoretical function curve graph with the non-radiative decay life of the laser crystal as an independent variable and the relaxation oscillation frequency as a dependent variable is built in combination with actual operation parameters (including pumping power, cavity structure parameters and crystal characteristics) of the laser; and finally, matching the actually measured relaxation oscillation frequency with the frequency value in the theoretical curve, and determining the non-radiative decay life value of the laser crystal through abscissa inversion. The method breaks through the limitation of a traditional measurement method, can realize non-intrusive high-precision measurement in a continuous working state of the laser, and is particularly suitable for in-situ characterization and life evaluation of non-radiation attenuation dynamics of the laser crystal in a solid laser system.

The invention discloses a laser damage threshold testing method, and relates to the field of damage testing, and the method can accurately evaluate the attenuation condition of laser in the underwater propagation process by installing an environment sensor group, collecting underwater propagation medium data in real time and performing real-time processing and analysis through a central processing system. A laser intensity attenuation coefficient is calculated through a scattering and absorption algorithm model, preliminary test evaluation is carried out on the laser intensity attenuation coefficient and a laser damage threshold value, and whether the laser intensity exceeds the tolerance upper limit of equipment in the current underwater working environment or not is detected in time. And if the laser intensity is abnormal, the system triggers a dynamic adjustment mechanism to adjust the output power, wavelength and pulse frequency of the underwater laser transmitter so as to reduce the laser intensity and avoid equipment damage. Therefore, the underwater laser transmitter can be effectively protected, it is ensured that the underwater laser transmitter safely and stably works in a complex underwater environment, and the tolerance and safety of equipment are greatly improved.

The invention belongs to the technical field of size detection, and particularly relates to a BIM (Building Information Modeling)-based building prefabricated part size detection device, which comprises a base, the device further comprises a first conveyor, a second conveyor, a scanning detection mechanism, a waste grabbing mechanical arm, a guide mechanism, a roughness synchronous detection mechanism, a waste quantity statistics mechanism, a continuous detection disqualification warning mechanism, a processor and a PLC. According to the invention, a detected component can be guided and positioned, so that the component can be moved to a detection station more accurately, the smoothness of the surface of the component can be synchronously detected in the guiding process, and the laser intensity of the three-dimensional laser scanner is automatically regulated and controlled based on the difference of the smoothness of the component, so that the detection accuracy is improved. The number of unqualified components can be counted, and when the number of the unqualified components exceeds a set threshold value or the number of the unqualified components continuously exceeds 10 times, a signal is fed back in time to remind a worker to make corresponding processing.

The invention provides an ocean engineering pile foundation scouring experiment maximum scouring depth estimation method based on an integrated underwater imager. According to the integrated underwater imager, a self-adaptive algorithm is matched with a multi-wavelength laser technology, the laser intensity, the wavelength and the scanning speed are adjusted in real time according to the transparency and the turbidity of a water body so as to adapt to different water body conditions, and scour depth data are efficiently and accurately obtained in a complex underwater environment through data fusion processing in combination with a sonic sensor. In the experiment implementation process, the integrated imager carries out data scanning at regular time, the obtained depth-of-impact elevation data is rapidly processed, and the maximum depth of impact and the change rate of the maximum depth of impact are judged in real time. And when the change rate is less than 5% continuously twice, the experiment is judged to reach a balance state, so that time and manpower are saved. Afterwards, the ARIMA model is utilized to analyze and predict the maximum depth data obtained through previous scanning, a more accurate maximum depth value is obtained, and the defects of the experiment are further made up. The scientificity and practicability of the ocean engineering pile foundation scouring experiment are remarkably enhanced, and the ocean engineering pile foundation scouring experiment device has wide application prospects.

The invention discloses a tunnel brightness measurement method based on point cloud intensity, which belongs to the technical field of tunnel illumination, and comprises the following steps: establishing an object reflection model, determining received laser power Pr based on a Lambert model, and correcting the distance d between the object surface and a laser reflector based on the Lambert model, and then introducing a BRDF model to correct the included angle theta between the incident light and the surface of the object so as to eliminate the influence of the two factors of the incident angle and the distance on the laser intensity value to obtain the object reflectivity rho1 and fr under the condition of the point cloud intensity I, and finally calculating the road surface brightness after reflection of the side wall of the tunnel. According to the invention, brightness measurement is carried out from the perspective of a three-dimensional laser scanning technology, a new brightness measurement method is provided, a tunnel brightness detection model considering multi-dimensional space parameters is established, the change of tunnel light environment characteristics is comprehensively analyzed, and a multi-dimensional space brightness detection model is provided in an active light detection form.

Disclosed in the present invention are an optical apparatus for measuring a nanoparticle concentration and a measurement method thereof. The optical apparatus comprises a sample cell, a rotary wheel installed with a neutral-density filter, an APD detector, a PD detector, a laser device, a lens, a data acquisition card and a control unit, wherein a laser emitted by the laser device passes through the lens to illuminate a sample in the sample cell; in a transmission direction, the intensity of the transmitted laser is measured by means of the PD detector; and a scattered signal from the sample is accepted at a 90° or in a backward direction by the APD detector connected to an optical fiber. The measurement method comprises: measuring a volume fraction Φ of a sample by means of a transmitted laser intensity signal and a light extinction method; measuring a particle size distribution of the sample by means of a scattered laser signal and a dynamic light scattering method; and calculating a volume fraction Φi and a number concentration of each particle size peak by means of the volume fraction Φ and the particle size distribution. The present invention combines a light extinction method and a dynamic light scattering method to implement the measurement of both a volume concentration and a number concentration of a sample.

The invention discloses a servo total station and a polygon prism identification method. The total station comprises a target identification unit, a servo driving unit, a measuring unit, a main control unit, a communication unit and a storage unit. According to the invention, coordinate and angle information of all prisms in the field of view can be identified and output simultaneously; only one time of ATR is needed, and then automatic rotation can be carried out for measurement according to angle information identified for the first time; the laser intensity and the receiving gain can be dynamically adjusted according to the prism distance, the signal intensity and other conditions, the stability and accuracy of signals under different distances and light conditions are ensured, then clear and stable light spot characteristics are obtained, and the method is particularly suitable for stable measurement under the condition of large atmospheric jitter. In a word, compared with a traditional single-target servo total station, the total station has remarkable advantages in the aspects of measurement efficiency, operation convenience, environmental adaptability, intelligent data processing and the like, and particularly, the total station shows obvious efficiency improvement and environmental adaptability in a scene with multiple prisms.

The invention belongs to the field of flue gas detection, and particularly discloses a laser rapid detection device and method for heavy metal in solid fuel, and in the detection device, a sample unit is used for placing a sample to be detected; the laser generating unit is used for emitting incident laser to a sample to be measured, the microwave generating unit is used for coupling microwaves to the incident laser, when the content of heavy metal is measured, the laser intensity is 100-300 mJ / fuse, the microwave power is 160-200 W, when the form of the heavy metal is measured, the laser intensity is 40-140 mJ / fuse, and the microwave power is 100-150 W; and the signal receiving unit is connected with the data processing unit. The method does not need to perform pretreatment on the to-be-detected sample, can realize in-situ online detection of the heavy metal in the solid fuel, can realize detection of the content and form of the heavy metal by adjusting the laser intensity and the microwave power, and has the advantages of high speed, high sensitivity, strong accuracy and the like.

The invention relates to a laser processing system (1) having at least one laser source (3, 4) for generating a plurality of mutually independent laser intensity distributions (5, 6). The laser processing system (1) comprises a control device (7) for controlling the laser power levels (P1, P2, 13, 14) and / or the beam quality levels (K1, K2, 14, 16) of the laser intensity distributions (5, 6) independently of one another. The laser processing system (1) is designed to vary the laser power levels (P1, P2, 13, 15) and / or the beam quality levels (K1, K2, 14, 16) of the laser intensity distributions (5, 6) differently from one another within each laser pulse by means of the control device (7). The invention also relates to a corresponding method for processing material (2) by means of corresponding laser radiation (5, 6).

The invention provides a laser shock strengthening rapid coating method, and belongs to the technical field of laser strengthening. The laser shock peening rapid coating method comprises the following steps that the surface of a substrate material is pretreated, and the substrate material to be coated is obtained; coating the surface of the substrate material to be coated with a coating material to form a coating layer; an absorption layer and a restraint layer are arranged on the surface of the coating layer, and a substrate material to be reinforced is obtained; and the substrate material to be strengthened is subjected to laser shock treatment, then cooling and cleaning are conducted, and the substrate material with the strengthened surface is obtained. According to the rapid coating method for laser shock peening, the materials and the thicknesses of the absorption layer and the restraint layer are specially limited, so that laser can act on the coating to the maximum extent, the coating material can form a compactly-attached coating on the surface of the substrate material more quickly, and the bonding strength between the coating and the substrate material is remarkably improved.

The application relates to a detection method and system for measuring residual oxygen concentration by laser, and relates to the field of gas concentration detection. The method comprises the following steps: selecting laser with oxygen absorption peak wavelength as detection laser, applying a periodically changed modulation signal to form a modulation laser and irradiate the headspace, demodulating a direct current component from the modulation laser passing through the headspace, calculating a deviation rate according to the direct current component and a reference direct current, judging whether the deviation rate is within a threshold value, feeding back and adjusting the laser wavelength if the deviation rate is not within the threshold value, and finally outputting a laser intensity attenuation curve of residual oxygen to obtain the residual oxygen concentration. The detection system comprises an optical subsystem, an electrical subsystem, a feedback control subsystem and a data processing subsystem. The application can accurately measure the residual oxygen concentration in the headspace, effectively detect and correct the laser wavelength drift, and improve the measurement precision and stability.

The utility model belongs to the technical field of optical instruments, and particularly relates to an optical tweezer optical path module and a cell optimization system. The optical tweezer optical path module comprises a supporting base, a laser head mounting seat and a multi-stage attenuation module. The laser head mounting seat is arranged on the supporting base and is used for mounting a laser emitting head for emitting laser; and the multi-stage attenuation module is arranged on the supporting base and comprises a plurality of reflection attenuation mirror groups which are arranged on the light path at intervals, and each reflection attenuation mirror group is used for attenuating the laser intensity and changing the laser direction. The optical tweezer optical path module provided by the utility model has a multi-attenuation mechanism, and a relatively large attenuation multiple range is easier to realize, so that laser power adjustment in a relatively large range is realized, the laser power dynamic adjustment capability is favorably improved, the laser intensity is finely controlled, and cells are not damaged when various cells are fixed through an optical trap formed by laser.

The invention belongs to the technical field of tunnel detection, and particularly relates to a laser point cloud color giving method based on a linear array image, which comprises the following steps of: 1, scanning and preprocessing the linear array image, generating a laser intensity image by using point cloud reflection intensity information of a laser section scanner, storing laser intensity of all points of a section in each column of the image, and obtaining a laser intensity image; the columns are distributed in the mileage direction; 2, image mileage direction alignment is carried out, and the linear array image and the section laser intensity image represent data of one section in each column and are arranged along the mileage direction; 3, longitudinally stretching and correcting the image; 4, performing multi-source image feature matching; and 5, constructing a pixel coordinate transformation relation. According to the method, projection consistency of the laser intensity image and the optical image is achieved through re-projection, then accurate registration of the laser intensity image and the optical image is achieved through feature matching, and finally unification of the laser intensity image and the optical image is achieved through a polynomial model, so that corresponding color information is found for each laser point cloud.

In an example, the present invention provides a system including a light source configured to generate a laser. The system has an optical enhancement cavity coupled to the light source and configured to increase an intensity of the laser and a cavity dumper coupled to the optical enhancement cavity. The system has an acoustic wave coupled to the cavity dumper to diffract the laser.

The invention discloses a method for calculating and eliminating laser intensity modulation and carrier phase delay in a modulation absorption frequency stabilization system, and belongs to the technical field of semiconductor laser frequency stabilization and precision detection. In order to improve the stability and accuracy of the output center frequency of the laser, a modulation absorption frequency stabilization system is built; executing a coarse adjustment stage of laser intensity modulation and carrier phase delay parameters, and obtaining a phase difference between light frequency modulation and light intensity modulation; a fine stepping optimization stage is executed, laser intensity modulation and carrier phase delay parameter calculation are completed, and the updated phase corresponding to the maximum peak-to-peak value of the light intensity absorption 1f signal and the phase corresponding to the maximum value of the extreme value difference of the light intensity absorption 2f signal are obtained; performing elimination processing to obtain a light intensity absorption 1f signal after elimination processing; and for the modulation absorption frequency stabilization system, residual light intensity fluctuation caused by current modulation on the tunable semiconductor DFB laser is eliminated by using a light intensity stabilization device. The stability and the accuracy of the output center frequency of the laser are improved.

The present application relates to the technical field of sensor data calibration, and specifically relates to a multi-sensor data calibration processing method, system and medium, the method comprising: obtaining at least two sensor data and standard second harmonic signal data; obtaining the second harmonic signal data corresponding to the laser intensity signal from the sensor data; determining the harmonic abnormal feature, the first difference rate and the second difference rate according to the second harmonic signal data and the standard second harmonic signal data; determining the calibration error parameter according to the harmonic abnormal feature, the first difference rate and the second difference rate; based on the calibration error parameter, the initial detected target gas concentration is calibrated to obtain the calibrated target gas concentration. The present application can correct the initial detected target gas concentration according to the calibration error parameter, improve the calibration accuracy, and further reduce the deviation between the sensor detected gas concentration and the real gas concentration.