12 results about "Beam plasma" patented technology

The invention provides an electromagnetic field constraint system and constraint method for a CO2 laser amplifier, and the system comprises a spiral electrode which is wound on a discharge tube of the CO2 laser amplifier, the spiral electrode comprises a first DC positive electrode, a radio frequency positive electrode, a second DC positive electrode and a ground electrode which are sequentially and adjacently arranged, and the current flows through the first DC positive electrode in the electric field direction from the first DC positive electrode to the ground electrode. The electric field direction of the current from the second direct current positive electrode to the ground electrode is partially perpendicular to the electric field direction of the current from the radio frequency positive electrode to the ground electrode; the CO2 laser amplifier discharge tube and the Helmholtz coil are coaxially arranged, and the magnetic field direction of the Helmholtz coil is perpendicular to the electric field direction from the radio frequency positive electrode to the ground electrode. In the discharge area of the CO2 laser amplifier, the strong electromagnetic field restraint system is adopted, the vertical alternating high-voltage electric field and the vertical alternating high-voltage magnetic field are used for restraining plasma movement, the electro-optical conversion efficiency can reach about 20%, the CO2 laser power can be effectively improved, and the arc discharge problem under the high radio frequency power injection condition is avoided.

The application provides a kind of electric thruster beam plasma parameter characteristic diagnostic system and method, it is related to plasma diagnostic field, the system includes vacuum chamber, for accommodating electric thruster and providing vacuum environment;Optical fiber signal acquisition module is set to the inside of vacuum chamber, for from multiple angles acquisition optical signal of the beam plasma generated by electric thruster;Image acquisition module is set to the outside of vacuum chamber, with optical fiber signal acquisition module light path connection, for receiving optical signal and converting into two-dimensional image time sequence;Data processing module is connected with communication with image acquisition module, for processing two-dimensional image time sequence, to reconstruct the four-dimensional distribution of the parameter of beam plasma.The application realizes low disturbance, low cost multi-parameter synchronous diagnosis by means of calibration optical fiber, light splitting filter and inversion process, improves efficiency and resolution.

The invention discloses a combined type micro-beam plasma arc welding shielding gas support cover capable of being flexibly positioned. The combined type micro-beam plasma arc welding shielding gas support cover comprises a clamping mechanism, a shielding gas cover body and a positioning bracket, the clamping mechanism is clamped with the welding gun; the protective gas hood body comprises a main protective gas hood and an auxiliary protective gas hood, the main protective gas hood and the auxiliary protective gas hood are buckled in a sliding mode, and a notch for a welding gun to penetrate through is formed in the buckling position of the main protective gas hood and the auxiliary protective gas hood. The outer walls of the main protective gas hood and the auxiliary protective gas hood are connected with gas delivery pipes; the positioning support comprises a pressing plate and spherical hinges, and the two ends of the pressing plate are movably connected with the spherical hinges. The two ends of the pressing plate are hinged to the clamping mechanism and the main protective gas hood through spherical hinges correspondingly, and the position of the protective gas hood body is flexibly adjusted. The protective gas supporting cover can be flexibly positioned and provide sufficient protective gas atmosphere.

The invention relates to the technical field of graphene preparation, and particularly discloses a controllable preparation method of high-uniformity laser-induced graphene, which comprises the following steps of: acting a main processing light beam, an annealing auxiliary light beam and a quenching auxiliary light beam on the same processing area of a substrate in a space-time synergistic manner, the main processing light beam is used for inducing the substrate to generate graphitization to form an sp2 carbon network; the annealing auxiliary light beam is triggered by a pulse of a preset delay time relative to the main processing light beam and is used for carrying out in-situ annealing on the processing area so as to repair defects in the sp2 carbon network; and the quenching auxiliary light beam is used for generating a plasma sheath layer in the processing area to isolate air and prevent oxidation. Through a three-beam space-time cooperative processing mechanism of main processing beam induced graphitization-annealing auxiliary beam in-situ annealing-quenching auxiliary beam plasma quenching, the problems of uneven interlayer structure and high defect density caused by a heat accumulation effect in traditional single-beam laser processing are solved.

An example plasma monitoring apparatus includes a monitoring structure fixed to a sidewall of a plasma chamber housing such that the monitoring structure is in contact with a viewport located in the sidewall of the plasma chamber housing, a cylindrical lens provided inside the monitoring structure and located at a front end of the monitoring structure, the cylindrical lens configured to receive a plurality of rays of plasma emission light emitted from a plasma space of interest inside the plasma chamber housing, and a plasma detector provided inside the monitoring structure and located at a rear end of the monitoring structure, the plasma detector configured to detect the plurality of rays of plasma emission light transmitted through the cylindrical lens. The cylindrical lens includes a side surface in a form of a circumferential surface convex or concave in a second horizontal direction.

The application discloses a coaxial pulse plasma thruster with a magnet as an outer electrode, and belongs to the technical field of microsatellite aerospace propulsion. The coaxial pulse plasma thruster with a magnet as an outer electrode mainly comprises an anode, a magnet cathode, a metal cathode, a propellant, an insulating outer shell, an insulating base, a supply spring and a spark plug. The metal cathode is divided into a perforated metal cathode and a non-perforated metal cathode. The thruster is coaxial in shape; the inner electrode is a solid cylinder, the outer electrode is a hollow pipe with a circular cross section, the solid propellant is located between the inner and outer electrodes, the supply spring is arranged between the tail of the propellant and the insulating base, and the outer electrode adopts segmented magnets and metal as the cathode. The application utilizes the magnetic field to restrict the radial movement of plasma so as to improve the collision ionization level, and provides Lorentz force to better accelerate the plasma. The segmented magnetic field provided by the segmented magnets with different magnetic poles opposite to each other can provide the magnetic field while reducing the overall mass of the thruster, and is beneficial to adjusting the magnetic field distribution in the thruster pipeline.

The utility model provides a normal-pressure plasma discharge device. The normal-pressure plasma discharge device comprises a device body, an air inlet, an outlet and a dielectric electrode, a columnar containing cavity is formed in the device body, a dielectric electrode is installed in the columnar containing cavity, and a plurality of cooling holes are formed in the dielectric electrode. The gas inlet is formed in one side, close to the process gas input source, of the device body, and the gas inlet is communicated with the columnar accommodating cavity; an outlet is formed in the side, close to the to-be-treated workpiece, of the device body, is formed in the axial direction of the columnar containing cavity in a slit shape and communicates with the columnar containing cavity. According to the device, the plurality of cooling holes are formed in the dielectric electrode, heat generated in the discharging process can be taken away in time, and performance reduction or damage caused by overheating of the electrode is avoided. The outlet is formed in the axial direction of the columnar containing cavity in a slit shape, wide plasma beams can be generated, a larger area can be covered in the working process of the device, and compared with a narrow-beam plasma processing mode, the processing efficiency is remarkably improved.

The invention provides an electric thruster beam plasma parameter characteristic diagnosis system and method, and relates to the field of plasma diagnosis, and the system comprises a vacuum chamber which is used for accommodating an electric thruster and providing a vacuum environment; the optical fiber signal acquisition module is arranged in the vacuum bin and is used for acquiring optical signals of beam plasma generated by the electric thruster from a plurality of angles; the image acquisition module is arranged outside the vacuum bin, is in light path connection with the optical fiber signal acquisition module and is used for receiving the optical signal and converting the optical signal into a two-dimensional image time sequence; and the data processing module is in communication connection with the image acquisition module and is used for processing the two-dimensional image time sequence so as to reconstruct four-dimensional distribution of parameters of the beam plasma. By means of optical fiber calibration, light splitting filtering and inversion processes, low-disturbance and low-cost multi-parameter synchronous diagnosis is achieved, and efficiency and resolution are improved.

The application discloses a multi-filament ion source, which comprises an ion source chamber, a cavity structure for ionization arranged in the ion source chamber, a gas supply assembly for uniformly inputting working gas into the ion source chamber, a multi-filament ionization assembly distributed along the length direction of the ion source chamber and used for ionizing the input working gas into plasma, a power supply protection assembly used for supplying power to the multi-filament ionization assembly, a magnet assembly used for forming a magnetic field in the ion source chamber and restraining the distribution of the plasma in the ion source chamber through the magnetic field, and an extraction electrode assembly used for directing the plasma to be extracted from the ion source chamber. The application ensures uniform ionization of the working gas in the chamber through the distributed filament ionization assembly and the uniform gas supply, forms stable distributed plasma, solves the problem of uneven distribution of the plasma, and has the advantages of improving ionization efficiency, equipment operation stability and consistency of ion beam output.

The utility model provides an alloy chemical element two-dimensional distribution detection system, and belongs to the technical field of metal detection. The alloy chemical element two-dimensional distribution detection system comprises an emitter, a light splitting part and a photoelectric detector, the emitter is configured to be capable of emitting laser, when the laser irradiates a sample, the sample can generate plasma light beams, the plasma light beams comprise characteristic light beams of at least two elements, and when the plasma light beams irradiate the light splitting part, the photoelectric detector emits photoelectric signals. Wherein the characteristic light beam of one element can penetrate through the light splitting part, the characteristic light beam of the other element can be reflected on the light splitting part so as to separate the plasma light beam into two characteristic light beams containing different element characteristics, and the photoelectric detector is configured to be capable of receiving the characteristic light beams of the elements so as to detect the content of the elements. According to the two-dimensional distribution detection system for the alloy chemical elements, the sample detection time can be shortened, and the efficiency of analyzing the distribution of various elements in the sample is improved.

The invention provides a beam light field quasi-periodic reconstruction system and method for discharge oscillation of an electric thruster. The method comprises the steps that after the electric thruster is started, beam plasma is sprayed out of the vacuum bin; the monitoring and modulation system monitors the discharge current, can send an image acquisition trigger signal to the shooting and processing system, or modulates the voltage input into the electric thruster to obtain the modulated discharge current, and returns to the step of monitoring the discharge current of the electric thruster; and the shooting and processing system is used for carrying out image acquisition on the beam plasma based on the image acquisition trigger signal to obtain a beam circumferential projection drawing time sequence after the current rotation of a preset angle, and processing the beam circumferential projection drawing time sequences at different angles according to a three-dimensional chromatography reconstruction algorithm to obtain a beam three-dimensional light intensity field time sequence. According to the method, low-cost and high-synchronization-precision dynamic reconstruction of the time sequence of the three-dimensional light field of the beam is realized.

The application provides a beam light field quasi-periodic reconstruction system and method for discharge oscillation of an electric thruster. The method comprises the following steps: spraying a beam plasma in a vacuum chamber after the electric thruster is started; monitoring and modulating a discharge current, sending an image acquisition trigger signal to a shooting and processing system, or modulating a voltage input into the electric thruster to obtain a modulated discharge current, and returning to the step of monitoring the discharge current of the electric thruster; based on the image acquisition trigger signal, the shooting and processing system acquires an image of the beam plasma, obtains a beam circumferential projection picture time sequence after a preset angle of rotation, processes the beam circumferential projection picture time sequence under different angles according to a three-dimensional tomographic reconstruction algorithm, and obtains a beam three-dimensional light field time sequence. The method realizes dynamic reconstruction of a beam three-dimensional light field time sequence with low cost and high synchronization accuracy.