8 results about "Beam density" patented technology

The embodiment of the invention discloses an ion source online detection method and device, electronic equipment and a storage medium, and relates to the technical field of ion sources, and the method comprises the steps: receiving an ion beam emitted by an ion source, and obtaining a first current signal and a second current signal based on the ion beam measurement; the first current signal is measured by moving the Faraday cup along a horizontal axis, and the second current signal is measured by the Faraday cup under at least one bias voltage; performing inversion according to the first current signal and a space response function of the Faraday cup to obtain beam density distribution of the ion source; and / or, according to the second current signal and the spatial response function, performing inversion to obtain ion energy distribution of the ion source; the spatial response function is used for representing the probability that the ion beam is collected after entering the Faraday cup; and carrying out on-line detection on the ion source based on the beam density distribution and / or the ion energy distribution. The embodiment of the invention is suitable for carrying out online detection on the large-size ion source, the detection mode is simple, and the cost is relatively low.

The utility model relates to a kind of diffraction waveguide light beam density regulation and control devices based on birefringence effect.The diffraction waveguide light beam density regulation and control devices based on birefringence effect include: waveguide substrate, made of material with birefringence effect;Coupling-in port, set in the incident plane of waveguide substrate, for coupling incident light;Coupling-out port, set in the exit plane of waveguide substrate, for coupling transmission light;Temperature regulation module, set in the side of waveguide substrate, for controlling the temperature of waveguide substrate, adjusting the propagation path of TE mode incident light and TM mode incident light inside waveguide substrate.The above-mentioned device utilizes the different diffraction angles of TE mode incident light and TM mode incident light due to different refractive indices, increases the propagation path width of light inside waveguide substrate, and improves the beam transmission density.Meanwhile, the temperature of waveguide substrate can be accurately controlled by temperature regulation module, to realize dark area distribution programmable and beam density dynamic optimization.

The invention provides a dynamic progressive micro-discharge polishing method for a grid assembly of an ion thruster, and relates to the technical field of space electric propulsion. According to the method, under the normal beam extraction working condition of the ion thruster, voltage between grids and extraction beam density are gradually increased in a staged mode, the controllable micro-discharge phenomenon on the surfaces of the grids is induced, and local high-temperature plasma generated by micro-discharge is used for conducting in-situ removal on burrs on the edges and the surfaces of grid holes. By optimizing the voltage-beam collaborative loading path, uniform etching and ablation of burrs are realized, and the surface quality of the grid electrode is remarkably improved. The method can be directly implemented after the ion thruster is assembled, disassembly or chemical treatment is not needed, and the method has the advantages of being high in process compatibility, high in efficiency and free of pollution.

The utility model discloses a light curtain protection mechanism of a high-speed laser cutting machine, and belongs to the technical field of light curtain protection devices. The light curtain protection mechanism of the high-speed laser cutting machine comprises a mounting bottom plate, an adjusting base is arranged on the mounting bottom plate, a first lead screw is arranged in the adjusting base, an emitter box body and a receiver box body are meshed on the first lead screw, and second lead screws are arranged in the emitter box body and the receiver box body. According to the light curtain protection mechanism of the high-speed laser cutting machine, through double adjustment of the first lead screw and the second lead screw, accurate control over the width, the height and the light beam density of a light curtain is achieved, different cutting requirements are met, the synchronous transmission design of the gear connecting rod telescopic frame ensures that the distance between the transmitter body and the receiver body is evenly adjusted, and the cutting efficiency is improved. The positioning precision and stability of the light curtain system are improved, deformation or missing detection of the light curtain is avoided, the multi-beam array design can cover a larger dangerous area, and protection blind areas are reduced.

The invention relates to the technical field of material experiments, in particular to a linear plasma material detection device which comprises a sample fixing assembly, a sample table and a fixing assembly, the sample fixing assembly comprises a water-cooling four-way assembly, a sample table and a fixing assembly, and the water-cooling four-way assembly comprises a first cylinder and at least one lateral cylinder which extend in the irradiation direction of a plasma beam; the first end of the first cylinder is connected with the plasma generation device, the first cylinder comprises a first side wall, a second side wall and a first cavity formed between the first side wall and the second side wall in a spaced mode, the first cavity is connected with the first water cooling assembly, the lateral cylinder penetrates through the side wall of the first cylinder, and the detection assembly is communicated with the experiment cavity through the lateral cylinder; the fixing assembly is used for fixing a sample to the irradiation position of the plasma beam, and the sample table is used for abutting against the sample and can cool the sample. Therefore, the problem that the temperature of the sample is too high due to the fact that higher plasma beam density is adopted in the plasma-driven permeation experiment process is solved.

The application discloses a three-dimensional laser scanning beam density precision regulation and control method based on a galvanometer dynamic regulation and control, and belongs to the technical field of three-dimensional laser scanning. The method comprises the following steps: performing initial three-dimensional laser scanning on a target region to obtain initial point cloud data; distributing grid coordinates to the point cloud; dynamically setting laser beam density and beam spacing according to parameter identification region types; analyzing the region according to the set parameters to generate a spiral scanning path; converting the path into a galvanometer control signal to control the laser beam to scan along the path; and precisely regulating laser parameters according to the scanning result. The method solves the technical problem that traditional three-dimensional laser scanning cannot adjust the spatial distribution density of the light beam in real time and cannot meet the differentiated precision structure surface complete scanning of the scene. The method realizes three-dimensional laser scanning beam density precision regulation and control, improves scanning precision and efficiency, reduces redundant data, and meets the scanning requirements of roadway surrounding rock, geological structure and other scenes.

The invention discloses a three-dimensional laser scanning beam density precise regulation and control method based on galvanometer dynamic regulation and control, and belongs to the technical field of three-dimensional laser scanning, and the method comprises the steps: carrying out the initial three-dimensional laser scanning of a target region, and obtaining initial point cloud data; grid coordinates are distributed to the point cloud; identifying the area type according to parameters, and dynamically setting the laser beam density and the light beam spacing; analyzing the area according to set parameters, and generating a spiral scanning path; converting the path into a galvanometer control signal, and controlling the laser beam to scan along the path; laser parameters are accurately regulated and controlled according to a scanning result; the technical problems that the spatial distribution density of light beams cannot be adjusted in real time in traditional three-dimensional laser scanning, and differential precision structural surface complete scanning of a scene is difficult to meet are solved. According to the invention, precise regulation and control of the three-dimensional laser scanning beam density are realized, the scanning precision and efficiency are improved, redundant data are reduced, and the technical effects of meeting the scanning requirements of scenes such as roadway surrounding rocks and geologic structures are achieved.

An ultrashort pulse laser having a multipass cell (2) which has at least two mirrors (3) arranged such that the at least two mirrors (3) repeatedly reflect laser pulses, wherein the multipass cell (2) has a partial beam density of at least 0.2 / cm3.