19 results about "Spot scanning" patented technology

The application provides a point melting forming method and system based on an electron beam heat source, and the method comprises the following steps: model slicing and path planning, adaptively slicing a three-dimensional model to obtain two-dimensional contour data of each layer section; point array processing, dividing a single layer section area into a contour point array and a filling point array, adaptively discretizing and sampling the contour point array based on curvature change, and generating a basic point array mode with regular arrangement for the filling point array; scanning sequence generation and optimization, converting the discretized point array into an ordered scanning instruction sequence, predicting thermal field evolution under different scanning sequences by establishing a thermal influence model, and iteratively optimizing the scanning sequence based on a multi-objective optimization algorithm; and layer-by-layer point melting forming, controlling electron beam point-by-point melting of metal powder according to the optimized point scanning sequence. The application replaces continuous line scanning with a discrete point melting mode, significantly reduces thermal accumulation and thermal stress, and improves the size accuracy and surface quality of the formed part.

The application discloses a multi-system microwave nondestructive testing and imaging scanning system and method, relates to the technical field of nondestructive testing, and comprises a near-field probe, a single-port vector network analyzer, a plane scanning frame and an upper computer.

The present application provides a fixed-target sample scanning method and system based on an X-ray free electron laser. The method comprises: acquiring a fixed target sample image of an X-ray free electron laser; performing sample identification on the basis of the fixed target sample image to obtain an identified sample image; acquiring a pulse point of the X-ray free electron laser, and sorting sample coordinates in the identified sample image on the basis of coordinates of the pulse point, to determine a scanning path of a fixed target sample; and performing fixed-point scanning on the fixed target sample on the basis of the scanning path. The present application realizes the identification and fixed-point scanning of a fixed target sample of an X-ray free electron laser, thereby improving the utilization rate, and further improving the experimental efficiency and the quality of data.

The utility model relates to a kind of fine-tunable galvanometer fixed frame, for installing galvanometer, including base and installation fixed plate, base is equipped with galvanometer mounting portion, galvanometer mounting portion surface is galvanometer mounting face, first recess is equipped on galvanometer mounting face, installation fixed plate is buckled on galvanometer mounting face, galvanometer is installed between galvanometer mounting portion and installation fixed plate, installation fixed plate is connected with galvanometer mounting portion by adjusting screw, adjusting screw is located at the both sides of galvanometer.Compared with prior art, the utility model has installation fixed plate and galvanometer mounting portion are connected by adjusting screw, after adjusting screw is tightened, the clamping of galvanometer is realized, and the angle of galvanometer can be changed by fine-tuning adjusting screw, the installation error caused by slight eccentricity of galvanometer or machining tolerance is compensated;Further ensure the stability and repeatability of laser spot scanning path, especially suitable for the two-photon fluorescence imaging system with extremely high requirements for scanning consistency and spatial optical axis coincidence degree.

The present application relates to the technical field of crystal nondestructive testing, and particularly relates to a crystal defect nondestructive testing method and system based on pumped probe transient absorption spectrum, which comprises the following steps: detecting a target region of a crystal to be tested by using pump light and probe light; collecting a transient absorption image of the target region according to a preset time delay between the pump light and the probe light, and extracting a target risk region; focusing the pump light and the probe light, and performing point-by-point scanning on the target risk region by using the focused pump light and probe light; collecting three-dimensional transient absorption intensity distribution and defect dynamic evolution data of each scanning point in the target risk region under different time delays; performing correlation calibration based on the transient absorption image and the three-dimensional transient absorption intensity distribution to obtain defect parameters; and constructing a damage prediction model based on sample damage threshold data, and outputting damage threshold prediction results according to the defect parameters. The purpose is to realize nondestructive and rapid detection of internal defects of deuterated potassium dihydrogen phosphate crystals.

The present application relates to a kind of low content component energy spectrum analysis method, belong to metallurgical dust resource utilization and material microanalysis technical field.The method includes: preparation sample exposure center section, obtain full section image by scanning electron microscope image splicing, and different analysis regions are divided;Low multiple energy spectrum area scanning is carried out in each analysis region, and the element distribution and zinc content data of multiple positions are obtained;For each analysis region, the arithmetic mean of residual zinc content is calculated as the regional representative value;Based on the characteristic data image of zinc element distribution, high multiple energy spectrum area scanning and point scanning are carried out on the characteristic micro area of zinc element aggregation to analyze the phase form and element composition of residual zinc.The present application realizes the quantitative, zoned, spatial positioning and multi-scale characterization of residual zinc content distribution and occurrence state in metallized pellet by "overall observation-zoned statistics-micro area analysis" progressive analysis, provides more accurate data support for process optimization.

The application discloses a hollow blade ceramic core processing method, and relates to the technical field of turbine blade manufacturing. One specific embodiment of the method comprises the following steps: first, scanning a core blank material; generating a milling cutter movement and a laser spot scanning track according to the size and shape of the core to be finally processed; measuring a processed core profile to fit and obtain an optimal pose of the core; obtaining a compensation distance of the core surface relative to a focal plane by laser ranging scanning in the coordinate system; setting different laser processing parameters for structures such as partitions, ribs and spoiler columns; and after processing is completed, removing the core, soaking it in an alkaline solution to remove surface residues, and corroding and chamfering sharp edges. The application can reduce the cost of opening a core mold, and realize rapid verification of various internal cavity air cooling structures.

A flying-spot scanning device, an imaging device, an adjustment method, a system, and a readable storage medium, relating to the field of security detection, and for use in improving the imaging quality of a flying-spot scanning device. The flying-spot scanning device comprises a base (1), a driving mechanism (2), a transmission mechanism (3), a flywheel (4), a detection mechanism (5), and a control assembly. The base (1) is configured to provide support. The driving mechanism (2) is mounted on the base (1) and supported by the base (1). The transmission mechanism (3) is mounted on the base (1) and supported by the base (1). The transmission mechanism (3) is drivingly connected to the driving mechanism (2) so as to rotate under the drive of the driving mechanism (2). The flywheel (4) is drivingly connected to the transmission mechanism (3). The detection mechanism (5) comprises a vibration detection assembly (51). The vibration detection assembly (51) is mounted on the transmission mechanism (3). The control assembly is electrically connected to the detection mechanism (5). The control assembly is configured to calculate, on the basis of the amplitude of vibration detected by the vibration detection assembly (51), whether the vibration of the flywheel (4) during movement meets requirements. Scanning and imaging can be performed only when the flywheel vibration meets the requirements, thereby ensuring imaging quality.

This invention relates to the field of laser precision welding technology, specifically to a dual-wavelength beam spot flexible adjustment composite welding system and method. The system includes a ring welding laser source, an adjustable ring beam shaping and deflection device, a spot scanning laser source, a pre-compensation beam expanding and shaping system, and a dichroic mirror. The ring welding laser source emits a first fundamental mode laser beam; the spot scanning laser source emits a second fundamental mode laser beam; the two beams are coaxially combined by the dichroic mirror and focused onto the target working surface. This invention achieves multi-dimensional and multi-condition flexible adjustment of the ring beam spot and precise welding control through the adjustable ring beam shaping and deflection device. The auxiliary optical path is responsible for high-precision spot scanning welding. Utilizing the characteristics of real ring beam generation and coaxial collaboration of the two optical paths, it solves the problems of arc initiation and termination defects, scanning haloing, and distortion in traditional ring welding, overcomes the shortcomings of complex beam spot adjustment in existing laser welding, and improves welding quality and processing flexibility. It is particularly suitable for precision welding of new energy lithium battery components.

The conventional crystal structure modeling method used to model crystalline materials to the atomic level is modified to determine point placement for radiation processing. The cross-sectional shape of the processing target is specified 202; the location (peak) in the density field inside the shape is determined using the crystal structure model 204; the location of points in the processing target is determined for point scanning 206, where the location corresponds to the location (peak) inside the shape determined using the crystal structure model; and the location of the points is stored as candidates to be potentially included in the radiation processing plan 208.

The application provides an optical imaging device and an optical imaging method. The optical imaging device comprises a light source module, a first galvanometer module, a second galvanometer module, a switching module and a main mirror body module. The second galvanometer module controls the two-dimensional deflection angle of the incident laser beam, realizes point-by-point scanning of the laser beam, adopts a two-photon excitation form of point-by-point scanning, improves the spatial resolution, increases the accuracy of optical stimulation, and accurately stimulates a single neuron. In addition, the holographic optical stimulation technology in the related art disperses laser light to multiple regions. Since two-photon excitation is proportional to the square of light intensity, a more expensive high-power femtosecond laser is often required. In the application, the laser beam is scanned point by point, so that each region receives sufficient stimulation energy, and a high-energy optical stimulation laser is not required, thereby reducing the cost and being more easily obtained.

The application discloses a flying point scanning control method and device, and belongs to the technical field of X-ray scanning imaging. The method is realized based on a flying focal point X-ray source and a static constraint device, and comprises the following steps: acquiring scanning control parameters which are independently set for multiple scanning positions, wherein the scanning control parameters comprise scanning time lengths corresponding to the scanning positions, and different scanning positions can be set as different values; and controlling a focal point switching process of the flying focal point X-ray source according to the scanning control parameters to perform flying point scanning. The application is based on pre-identification of a scanning area, different areas adopt different scanning modes, empty areas can be directly skipped, and key areas are strengthened for scanning. The application reduces a radiation dose, improves scanning efficiency, and improves imaging quality of key areas. However, the existing feedback type scheme cannot distinguish empty areas and metal areas (scattering signals are also weak), and is prone to misjudgment and resource waste.

This invention discloses a high-quality exfoliation method for large-size diamonds using dual-laser composite modification, comprising the following steps: placing and fixing the sample on a three-dimensional moving platform, with the upper surface of the sample being the (100) crystal plane; focusing a laser generated by an ultrafast laser generator through the upper surface of the sample into the sample interior, and then performing a first point scan on the sample using the laser generated by the ultrafast laser generator to form an independent dot matrix structure; performing a second point scan on the sample using the laser generated by the ultrafast laser generator to form a crack-interconnected dot matrix structure; performing a third line scan on the sample using a laser generated by a nanosecond laser generator; and finally, ultrasonically exfoliating the sample in a water bath. This invention, by employing a dual-laser composite modification process combined with a biomimetic "honeycomb" and "tortoise shell" crack structure design, effectively guides the cracks to propagate directionally along the (100) crystal plane, avoiding the oblique cracking problem of the previous exfoliation surface being the (111) crystal plane, and greatly improving the integrity and smoothness of the exfoliation surface.