1876 results about "Pulsed laser" patented technology

The invention relates to the technical field of power equipment state monitoring, in particular to an oil-immersed transformer distributed temperature measurement method based on a fluorescent optical fiber sensor, and the method comprises the steps: arranging the fluorescent optical fiber sensor in a key temperature rise region in a transformer in a partitioned and layered three-dimensional topological structure, and forming a distributed temperature measurement network; exciting light is injected through a pulse laser to excite a fluorescence signal; a dual-channel phase-locked amplification technology is used to collect signals, and a dual-weight adaptive attenuation model and an oil flow coupling compensation function are combined to demodulate the temperature; reconstructing a dynamic temperature field based on a three-dimensional thermodynamic inversion algorithm, and marking high-gradient hot spots; and temperature, load current and oil flow velocity data are fused to realize graded alarm. According to the invention, the limitation of traditional single-point monitoring is broken through, the strong electromagnetic interference resistance is excellent, a global temperature field can be accurately reconstructed, dynamic early warning is realized, and the operation safety and the operation and maintenance efficiency of the transformer are remarkably improved.

The invention discloses a high-temperature airflow two-dimensional temperature field and velocity field synchronous measurement system and method based on laser-induced phosphorescence, and the system comprises phosphorescence particles, a low-frequency double-pulse laser, an image collection device, a synchronous controller, and an image processing device. The image processing device analyzes the gray intensity ratio of different wave band images acquired by the two PIV cameras at the same time, and combines a temperature response function calibrated by an experiment to realize inversion of a temperature field; meanwhile, a double-frame time-resolved image acquired by any PIV camera is subjected to cross-correlation calculation, particle displacement is extracted, and then a velocity field is reconstructed. According to the invention, synchronous acquisition of temperature and speed based on the same data source is realized, and the system has the remarkable advantages of simple structure, high measurement precision and wide application environment.

Various implementations of implants and implant surfaces for clinical rehabilitation or enhancement of a patient, related systems, and computer programs and methods for the design and manufacturing of implants are disclosed. A macroscale shape, a microscale surface texture, and a nanoscale surface topography are overlaid to increase, condition, and thereby functionalize an implant surface. A thin-film coating and / or laser interferometry is utilized to overlay on a machined implant substrate a nanoscale surface topography. Manufacturing the macroscale shape and the microscale texture may be performed with an ultrashort pulsed laser system in separate process steps. The design of a dental implant may be assisted by a self-learning computer program product, based on trained coupled shape models including, for example, mesh-based statistical shape and orientation models.

The invention discloses a device and method for measuring dust concentration distribution at an inlet of an aero-engine, and belongs to the field of aero-engine sand swallowing tests, the device comprises a pulse laser light source, a shaping module, an optical image acquisition module and a data post-processing module, the pulse laser light source is arranged at a preset position around the aero-engine and is used for emitting laser beams, and the shaping module is used for shaping the laser beams; the aero-engine is located in a sand dust environment to be detected; the shaping module is used for receiving the laser beam and outputting a sheet-shaped beam; the optical image acquisition module is used for receiving coherent scattered light emitted by the grit in the irradiation area of the flaky light beam to form a laser speckle image, and transmitting the obtained laser speckle image to the data post-processing module; and the data post-processing module processes the laser speckle image by adopting an inlet sand dust concentration measurement algorithm to obtain the concentration distribution of the inlet sand dust of the aero-engine. The device is simple in structure, and is suitable for measuring the sand dust concentration distribution at the inlet in the sand swallowing experiments of aero-engines with different sizes or stages.

A concrete damage real-time positioning method based on laser induction and dynamic wave velocity correction comprises the following steps: constructing a damage induction platform integrated with a high-energy pulse laser, combining with a three-dimensional mobile platform to realize accurate positioning of a laser focus, and arranging a phase demodulation type optical fiber acoustic emission sensor array to construct a full-coverage monitoring network; synchronous acquisition of high-frequency acoustic emission signals is realized by adopting a multi-channel coupling phase demodulation system, and noise suppression is completed in combination with a self-adaptive wavelet threshold algorithm; a dynamic wave velocity attenuation model is established based on space-time reference information, a propagation path is optimized through a Basic Theta * path planning algorithm, a wave velocity field is reconstructed by applying an ART algebraic iteration algorithm, and a thermodynamic diagram is generated; and finally, constructing a convolution-graph neural joint network model, and realizing accurate monitoring and positioning analysis of the concrete structure damage through a damage probability distribution generation and multi-scale verification module by using a multi-modal data fusion and transfer learning technology.

The invention provides a laser surface treatment method, device and equipment based on visual control, and the method comprises the steps: carrying out the energy waveform capture processing of pulse laser outputted by laser marking equipment, and carrying out the multi-channel visual detection of a surface reflection region of a to-be-marked part based on a pulse energy reference, and obtaining the surface feature information; planning an initial scanning path according to the surface feature information, and synchronously correcting a trigger time sequence of the pulse laser to obtain a target marking path; and in combination with the target marking path and the pulse energy reference, dynamic observation and local heat dispersion treatment are conducted on the marking area, and the treated part surface is obtained. The method is suitable for performing fine marking on a high-reflectivity or complex geometric surface, and can perform timely adjustment according to local temperature rise or optical characteristic change in the marking process to reduce depth unevenness and thermal damage.

A wide-field dynamic magnetic imaging device and method. The wide-field dynamic magnetic imaging device comprises: a probe assembly (1), comprising a diamond (101) containing NV centers; a microwave magnetic field assembly (2) configured to generate a uniform microwave field and a uniform bias magnetic field in the vicinity of the diamond (101), so as to regulate the spin energy level of the diamond (101) and the quantum state evolution process; a laser modulation assembly (3) configured to output an initial uniform pulsed laser to excite the diamond (101) to emit fluorescence; a fringe light modulation assembly (4) configured to modulate the initial uniform pulsed laser to output a fringe pulsed laser, causing the fluorescence emitted by the diamond (101) to be fringe fluorescence, or to modulate the fluorescence emitted by the diamond (101) into fringe fluorescence; a fluorescence detection assembly (5) configured to perform spatial imaging on the fringe fluorescence to obtain magnetic field information of a sample under test (7), thereby obtaining an initial magnetic image of said sample (7); and a data processing assembly (6) configured to perform Fourier transform and inverse Fourier transform on the initial magnetic image to obtain a first magnetic image.

A pulsed laser source device configured to a plurality of Fabry Perot resonant cavities. The pulsed laser source device provides a frequency, a wavelength, and a phase, each of which is matched with a plurality of laser beams configured, respectively, with the plurality of Fabry Perot resonant cavities to generate a high intensity beam for laser fusion.

The invention discloses a laser coaxial beam combining system for improving the repetition frequency of laser pulses, which comprises p polarization pulse lasers, a pulse time sequence controller and n stages of beam combining devices, each stage of beam combining device comprises an s polarization pulse laser, a polarization beam combiner and an electro-optical Q switch, and n is a non-negative integer and is greater than or equal to 1. The invention has the following advantages: a plurality of beams of laser in different polarization states can be combined, the pulse repetition frequency and the output average power of the laser are improved, the optimal pulse energy and peak power are maintained, and coaxial output of pulses in the same polarization state is realized.

The invention discloses an extensible multi-path beam combination laser assembly and a laser, and relates to the technical field of laser beam combination. The extensible multi-path beam combining laser assembly comprises a half-wave plate, a reflecting element, a polaroid, a Q switch, a controller and 2n basic lasers. The basic laser can output initial pulse laser with the polarization direction being the first direction, every two of the 2n initial pulse laser beams can be combined into 2n-1 pulse laser beams, and every two of the 2n-1 pulse laser beams can be combined into 2n-2 pulse laser beams until the 2n pulse laser beams are combined into one beam of output pulse laser. When the Q switch is turned on, the polarization direction of the pulse laser penetrating through the Q switch can be deflected by 90 degrees. When the pulse laser beams are combined, the first pulse laser beam passes through a Q switch and a reflecting element which are arranged along the light path of the first pulse laser beam, the polarization direction is the first direction or the second direction, and the first pulse laser beam is reflected to a polaroid arranged along the light path of the second pulse laser beam to be combined. Therefore, beam combination of multiple paths of laser is achieved, and even if light path faults exist, the multiple paths of laser after beam combination can be output.

The invention relates to the field of medical image processing, in particular to a lesion recognition method and system for non-staining biopsy cells, and the method comprises the steps: carrying out the imaging collection of the non-staining biopsy cells flowing at a high speed through the time sequence synchronous control of pulse laser and high-speed imaging, and obtaining an original cell image; performing image preprocessing on the original cell image to obtain a preprocessed cell image; performing multi-target cutting on the preprocessed cell image to obtain a standardized single cell image; extracting multi-scale features of the standardized single cell image based on a deep learning model to obtain a lesion recognition result corresponding to the non-staining biopsy cells; and based on a preset structured report generation algorithm and a statistical distribution modeling mechanism, performing structured integration on the lesion recognition result to obtain a structured cell diagnosis report. Through pulse laser imaging and deep learning feature extraction, automatic lesion recognition of non-staining biopsy cells is realized, a report is efficiently generated, and accurate diagnosis is assisted.

Various implementations of implants and implant surfaces for clinical rehabilitation or enhancement of a patient, related systems, and computer programs and methods for the design and manufacturing of implants are disclosed. A macroscale shape, a microscale surface texture, and a nanoscale surface topography are overlaid to increase, condition, and thereby functionalize an implant surface. A thin-film coating and / or laser interferometry is utilized to overlay on a machined implant substrate a nanoscale surface topography. Manufacturing the macroscale shape and the microscale texture may be performed with an ultrashort pulsed laser system in separate process steps. The design of a dental implant may be assisted by a self-learning computer program product, based on trained coupled shape models including, for example, mesh-based statistical shape and orientation models.

The invention relates to a semiconductor wafer generation method, which comprises the following steps of: firstly, setting laser scanning times, and then respectively setting a scanning path and a dot spacing of each laser scanning; determining a laser scanning speed and a laser pulse repetition frequency based on a calculation rule preset for each laser scanning, and determining a corresponding modified point diameter, laser pulse energy and an offset distance of a laser focus relative to a preset stripping surface; the pulse laser is focused on a preset stripping surface in the crystal ingot or below the preset stripping surface, and n times of laser scanning are carried out, so that modified points and cracks are sequentially formed on the preset stripping surface; and stripping the crystal ingot along the preset stripping surface to obtain a wafer and a residual crystal ingot. The method not only can eliminate burrs at the edge of the wafer, but also can further reduce the material loss of laser stripping, and has the advantages of simple process conditions, good modified layer morphology, low wafer stripping difficulty and suitability for large-scale industrial application.

Various implementations of implants and implant surfaces for clinical rehabilitation or enhancement of a patient, related systems, and computer programs and methods for the design and manufacturing of implants are disclosed. A macroscale shape, a microscale surface texture, and a nanoscale surface topography are overlaid to increase, condition, and thereby functionalize an implant surface. A thin-film coating and / or laser interferometry is utilized to overlay on a machined implant substrate a nanoscale surface topography. Manufacturing the macroscale shape and the microscale texture may be performed with an ultrashort pulsed laser system in separate process steps. The design of a dental implant may be assisted by a self-learning computer program product, based on trained coupled shape models including, for example, mesh-based statistical shape and orientation models.

The invention relates to a hard and brittle material large depth-diameter ratio small hole laser milling-precision grinding process and a device thereof.The method comprises the steps that firstly, a mapping relation between an inlet aperture and laser parameters is established through a response surface method, laser machining parameters are determined, and laser machining parameters are obtained on the basis of an optical image acquisition system; a pulse laser is adopted to prepare the large-depth-diameter-ratio micro through hole with the accurate and controllable ablation amount, the grinding amount is reduced, meanwhile, the strength, hardness or fracture toughness of materials at the machining position is reduced, and therefore the grinding force for machining hard and brittle materials and tool abrasion are reduced; and secondly, machining damage such as microcracks, recast layers and taper caused by laser machining is removed through grinding machining, and the machining quality of the small hole with the large depth-diameter ratio is improved. The device mainly comprises a machine body, a workbench, a laser machining main shaft, a grinding machining main shaft, a differential interference difference microscope, an optical CCD camera and an X-axis and Y-axis servo driving module, different machining processes and in-situ detection can be completed on the same machine tool, the problems of secondary clamping, poor repeated positioning precision and the like of workpieces are solved, the machining efficiency is improved, and the machining cost is reduced. According to the method, bottom hole laser machining of the hard and brittle materials is highly combined with grinding hole repairing and hole expanding, high-quality and high-efficiency machining of the hard and brittle materials is achieved, tool abrasion is reduced, and the machining cost is reduced.

Various implementations of implants and implant surfaces for clinical rehabilitation or enhancement of a patient, related systems, and computer programs and methods for the design and manufacturing of implants are disclosed. A macroscale shape, a microscale surface texture, and a nanoscale surface topography are overlaid to increase, condition, and thereby functionalize an implant surface. A thin-film coating and / or laser interferometry is utilized to overlay on a machined implant substrate a nanoscale surface topography. Manufacturing the macroscale shape and the microscale texture may be performed with an ultrashort pulsed laser system in separate process steps. The design of a dental implant may be assisted by a self-learning computer program product, based on trained coupled shape models including, for example, mesh-based statistical shape and orientation models.

The invention discloses a synchronous clock correction device and method for a time-gated spectral measurement and optical imaging system, and the device comprises a pulse laser, a sample stage, a spectrometer, an image intensifier, a detector, a delayer, a gating module, a control computer, and a synchronous correction module. The pulse laser outputs sample exciting light to the sample table, the spectrograph, the image intensifier and the detector, one path of a synchronous trigger signal is output to the synchronous correction module, and the other path of the synchronous trigger signal is transmitted to the image intensifier through the delayer and the gating module; detecting a gating signal through a synchronous correction module, comparing a time difference between the gating signal and a synchronous trigger signal to obtain a delay adjustment value, and adjusting a delayer through a control computer, so that the time when the gating signal starts an image intensifier is consistent with the time when an optical signal generated after a sample is excited to reach the image intensifier; according to the invention, the influence of temperature drift in an electronic system is reduced, the stability of the system is improved, and the measurement error is reduced.

The invention provides an online detection and compensation method for local decarburization of a high-strength spring steel band, which comprises the following steps: arranging an oxygen content sensor in a continuous annealing furnace to monitor oxygen concentration in real time, and marking a potential decarburization risk section; scanning the risk section steel strip by adopting infrared thermal imaging, and generating a carbon distribution map to position a decarburization area; pulse laser heating is conducted on the decarburization area, and methane-argon mixed gas is introduced to achieve in-situ carburization; and finally, local thermal stress is eliminated through high-frequency induction heating. According to the method, decarburization risk dynamic early warning, defect accurate positioning, local efficient carbon supplementation and stress homogenization control are achieved, and the surface quality and fatigue performance of the steel strip are remarkably improved.

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 discloses an array type optical fiber ultrasonic imaging system based on multi-path delay parallel detection, and belongs to the technical field of ultrasonic detection and imaging. The main working process of the system is as follows: continuous laser output by a laser is modulated into pulse laser to be transmitted to an optical fiber ultrasonic detector array, and ultrasonic waves emitted by an ultrasonic wave generating device act on each detection array element to cause the property change of a detection optical signal; through multi-path time delay with the optical fiber as the medium, the detection optical signal forms different transmission time in each channel, is distinguished in a time division mode and is combined into a single path to be output. After photoelectric conversion, electric signals containing multi-channel detection information are collected in parallel, the signals are analyzed at a terminal processor by means of an imaging algorithm with an array parallel architecture, information of a to-be-detected target is obtained, and image reconstruction is completed. The array type optical fiber ultrasonic imaging system has the advantages of being accurate and rapid in scanning detection, simple and compact in system structure and efficient and high-quality in image reconstruction, and large-scale and low-cost array type optical fiber ultrasonic imaging is achieved.

The invention provides a dual-wavelength tunable all-solid-state mid-far infrared laser, relates to the technical field of lasers, and is used for solving the technical problems that high-performance dual-wavelength 3 [mu] m waveband laser and mid-far infrared waveband laser generated by pumping of the high-performance dual-wavelength 3 [mu] m waveband laser are difficult to obtain in the prior art. The middle and far infrared laser comprises an erbium-doped laser and an optical parametric oscillator, the erbium-doped laser is used for providing dual-wavelength 3-micron wave band pulse laser, and the erbium-doped laser comprises a pumping source, an erbium-doped laser medium, a gain modulator, a high reflective mirror and an output mirror; the optical parametric oscillator is used for obtaining medium-wave infrared laser and long-wave infrared laser which are output in a dual-wavelength mode under the pumping effect of the dual-wavelength pulse laser in the 3-micron wave band. The mid-far infrared laser is simple in structure and convenient to use, can obtain tunable dual-wavelength mid-far infrared pulse laser with high beam quality, and meets the light source requirements of differential absorption of toxic gas telemetering of laser radar and photoelectric countermeasure.

An electrodeless laser-driven light source includes a laser that generates a CW sustaining light. A pump laser generates pump light. A Q-switched laser crystal receives the pump light generated by the pump laser and generates pulsed laser light at an output in response to the generated pump light. A first optical element projects the pulsed laser light along a first axis to a breakdown region in a gas-filled bulb comprising an ionizing gas. A second optical element projects the CW sustaining light along a second axis to a CW plasma region in the gas-filled bulb comprising the ionizing gas. A detector detects plasma light generated by a CW plasma and generates a detection signal at an output. A controller generates control signals that control the pump light to the Q-switched laser crystal so as to extinguish the pulsed laser light within a time delay after the detection signal exceeds a threshold level.

The invention relates to a phase-sensitive optical time domain reflectometer based on a parallel frequency division multiplexing sequence. Continuous laser is divided into a local path and a detection path through an optical coupler; the local path is input to the polarization coherent receiving module, the detection path is converted into a pulse laser sequence with intensity modulation through a light intensity modulator driven by a radio frequency signal provided by the signal generation circuit module, and the radio frequency signal is composed of two frequency division multiplexing sequences with difference; the pulse laser sequence enters the sensing link to be measured to generate Rayleigh backscattered light, and the Rayleigh backscattered light and local continuous laser are subjected to beat frequency coherent receiving through a circulator; and the signal acquisition circuit is used for sampling and analyzing the interference signal, and performing frequency domain comparison on an interleaving result of the two frequency division multiplexing pulse sequences to eliminate a harmonic frequency and retain a real strain signal frequency. Compared with the prior art, the non-harmonic strain signal measurement is realized, the high-frequency response performance and the high-precision strain measurement capability are excellent, and meanwhile, the long-distance coverage capability is also realized.

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 discloses an endoscope system based on harmonic imaging and multiphoton fluorescence imaging. The endoscope system comprises a first femtosecond pulse laser, a second femtosecond pulse laser, a prism, an X-Y scanning galvanometer, a first long-wave-pass dichroscope, a coupling objective lens, an optical fiber bundle, an endoscope and an imaging device. The first femtosecond pulse laser and the second femtosecond pulse laser respectively emit near-infrared femtosecond pulse laser, the near-infrared femtosecond pulse laser enters the X-Y scanning galvanometer after being converged by the prism, then penetrates through the first long-wave-pass dichroscope, is coupled into the optical fiber bundle through the coupling objective lens, and finally is focused on a measured tissue through the endoscope. The first long-wave-pass dichroscope excites the detected tissue and the fluorescent substance thereof to generate second harmonic, third harmonic, two-photon fluorescence and three-photon fluorescence, and harmonic and fluorescence signals return along the same path and enter the imaging device after being reflected by the first long-wave-pass dichroscope, so that a second harmonic image, a third harmonic image, a two-photon fluorescence image and a three-photon fluorescence image of the detected tissue are obtained. Harmonic waves and multi-photon fluorescence imaging are combined, and pathological tissues in the cavity can be detected.

The invention provides a single-line excitation OH plane laser-induced fluorescence temperature measurement system and method, and belongs to the technical field of aero-engine special tests, the system comprises an Nd: YAG laser, a sheet light shaping lens group, two ICCD cameras and a data acquisition device, the laser outputs quadruplicated pulse laser, the sheet light shaping lens group is arranged at the output end of the laser, and the data acquisition device is arranged at the output end of the laser. Laser sheet light is output through the sheet light shaping lens group to illuminate a to-be-detected area in the flame and reacts with OH groups in the flame to generate fluorescent light; the cameras are respectively arranged opposite to flames, are respectively in communication connection with the data acquisition device, are respectively provided with a band-pass optical filter with different bandwidths, and are used for synchronously measuring fluorescence to obtain a bispectral fluorescence image, and the data acquisition device is used for carrying out data processing on the image to realize two-dimensional temperature distribution measurement. Through the processing scheme provided by the invention, the measurement system configuration and the data processing flow are remarkably simplified, and the light spot quality and the signal-to-noise ratio are improved.

The invention relates to a low-power pulse laser-induced enhanced double-TIG (Tungsten Inert Gas) composite heat source medium-thickness plate narrow-gap efficient welding method, which adopts two independent TIG welding machines, a pulse laser and a wire feeder, and two TIG welding guns are positioned in a narrow-gap groove on the same side of a plane on which a laser beam perpendicular to the plate welding direction is positioned, the angle and distance of each heat source can be independently adjusted, before welding, the space angle and distance among the two TIG welding guns, laser beams and welding wires are adjusted, tungsten electrodes at the front ends of the two TIG welding guns and the laser beams emitted by a laser device are arranged in the corresponding space range, and a plate to be welded and the welding wires can obtain sufficient heat for melting, wetting and spreading; during welding, welding parameters are adjusted, the coupling plasma energy density in the narrow gap space range is controlled, and the droplet transition behavior of a welding wire and the flow characteristic of a molten pool are adjusted and controlled in real time. Compared with traditional arc welding, the welding process window can be improved, and the welding deposition efficiency is improved by more than 10 times.

The invention discloses an infrared photothermal imaging system and method in structured light illumination fluorescence detection, and belongs to the field of super-resolution imaging. The system comprises a structured light generation module, a fluorescence excitation module, a fluorescence collection module and a mid-infrared light thermal module. The structured light generation module generates structured light with adjustable phase and direction; the fluorescence excitation module inputs the structured light to a to-be-analyzed sample and excites the sample to emit fluorescence; meanwhile, infrared pulse laser can be input into a sample by utilizing a mid-infrared photothermal module, and the fluorescence intensity is modulated by utilizing a photothermal effect; finally, fluorescent light emitted by the sample is collected by a fluorescent light collecting module, and an infrared photothermal image in structured light illumination is obtained. The system breaks through the diffraction limit, the resolution ratio is increased by two times at most, the intrinsic infrared spectrum of the sample is obtained through mid-infrared photothermal imaging, and the chemical components and the structure of the sample are reflected. According to the invention, two technologies are combined, so that the intrinsic infrared spectrum information of the sample is provided under the sub-diffraction limit.

The invention belongs to the technical field of photoelectric countermeasure, and particularly relates to a CMOS detector damage system based on time-domain composite pulse laser, which comprises a time-domain composite pulse laser generation module, a light beam transmission and focusing module, a target damage monitoring module, a parameter optimization control module and a detector to be damaged. The time domain composite pulse laser generating module comprises a short pulse laser, a long pulse laser, a pulse synchronous controller, a power adjusting unit, a power supply module and a cooling device, and the power adjusting unit is electrically connected with the short pulse laser and the long pulse laser; and the power supply module is electrically connected with the long pulse laser, the short pulse laser and the cooling device. According to the method, energy loss generated by plasmas in a traditional laser damage method is avoided, the damage efficiency is remarkably improved, efficient transmission and concentration of energy in the multilayer structure are achieved through the synergistic effect of long pulses and short pulses, all layers of materials synchronously lose efficacy in a short time, and the damage consistency of the whole multilayer structure is ensured.

Disclosed is a detection device for laser spot welding micro-weld spot quality based on laser ultrasound, comprising: a nanosecond pulsed laser configured to emit a laser; a half-wave plate configured to generate a phase difference of the laser; a scanning galvanometer configured to focus the laser as a point source and excite an ultrasonic wave on a surface of a sample; a multi-axis displacement platform configured to place and / or move the sample; a laser Doppler vibrometer configured to emit a probe light; an image sensor configured to acquire image data of the sample in a plurality of attitudes; an optical filter configured to receive the probe light to adjust an intensity of the probe light; and a processor configured to be in communication connection with the image sensor, the optical filter, the nanosecond pulsed laser, the scanning galvanometer, the multi-axis displacement platform, and the laser Doppler vibrometer.