24 results about "Plasma electron" patented technology

This invention belongs to the field of laser cladding detection technology, specifically relating to a method for extracting and analyzing spectral signal features during the cladding process of PDC drill bits. The method includes: acquiring a real-time plasma spectral sequence of the PDC drill bit cladding process using a fiber optic probe and spectrometer; obtaining spectral line effectiveness weights based on the intensity and signal-to-noise ratio of characteristic spectral lines in the plasma spectral sequence; obtaining elemental fusion state indices based on the spectral line effectiveness weights, the intensity of hard phase spectral lines, and the intensity of binder phase spectral lines; obtaining cladding quality stability based on the elemental fusion state index and plasma electron density fluctuations; and determining cladding defects in the PDC drill bit based on the cladding quality stability. This invention effectively suppresses the interference of strong background noise on the monitoring results by integrating spectral signal-to-noise ratio weights and electron density fluctuation characteristics, thus improving the accuracy of detecting component segregation and thermodynamic instability in the cladding layer.

This invention relates to the field of aerospace propulsion technology, and in particular to an oxygen-resistant Hall thruster electric propulsion system, comprising a Hall thruster, a radio frequency neutralizer, a power processing unit, a working propellant storage and supply system, and an integrated electronic control system. This invention establishes an electrical connection between the Hall thruster and the radio frequency neutralizer, directly connecting the collecting electrode to the negative terminal of a high-voltage power supply, eliminating the holding electrode and its independent power supply branch. Simultaneously, it combines a dual-path working propellant supply structure with oxidation-resistant conductive materials for the anode and collecting electrode. This allows the radio frequency neutralizer to rapidly establish a plasma electron source without the need for traditional hot cathode preheating. After the Hall thruster ejects the ion beam, electrons are automatically extracted based on the potential gradient. This not only reduces the complexity of the system's power supply structure and improves the discharge stability and electron compensation capability in low-purity working propellants and oxygen-containing environments, but also enhances the system's oxygen-resistant lifetime and rapid start-up performance in low Earth orbit oxygen-rich environments.

The application discloses a kind of dual-channel wave-absorbing devices based on plasma composite material, it is related to plasma application field, device includes: metal base, first wave-absorbing material layer, plasma array, second wave-absorbing material layer, first isolation protection layer and second isolation protection layer;First wave-absorbing material layer is set on the upper surface of metal base;First wave-absorbing material layer top is equipped with plasma array;The top of plasma array is equipped with second wave-absorbing material layer;First isolation protection layer and second isolation protection layer are set on the two sides of plasma array;Two wave-absorbing material layers and two isolation protection layers constitute cavity structure;Plasma array is set in cavity structure, so that plasma array is in the cavity formed by wave-absorbing material layer, conducive to the generation and maintenance of plasma electron density, to improve wave-absorbing effect and wave-absorbing performance, in addition, using plasma and wave-absorbing material layer combination forms composite dual-channel wave-absorbing structure, greatly improve wave-absorbing performance.

The application discloses a plasma electron temperature two-dimensional distribution multi-time point diagnosis method and device based on an X-ray waveband sheet array, equipment and a medium, and comprises the following steps: acquiring two X-ray coded images under the same time signal; reconstructing the X-ray coded images through a coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image; constructing a corresponding relationship between the intensity ratio and the electron temperature of the two high-resolution X-ray intensity images at the same position based on the working principle of a multi-channel filter sheet method; determining the electron temperature two-dimensional distribution information at the time point according to a plurality of corresponding relationships, and expanding the electron temperature two-dimensional distribution multi-time point data. The application belongs to the field of plasma electron temperature diagnosis. The application can improve the light collection efficiency and the spatial resolution.

The application discloses a kind of plasma electron sponge nanochannel composite membranes and preparation method and application thereof, the composite membrane includes a layer of self-assembled arrangement plasma electron sponge film and a layer of membrane material with large pore structure, part of the pore in the self-assembled arrangement plasma electron sponge film and part of the large pore in the membrane material with large pore structure are communicated correspondingly, and electron sponge refers to polyoxometalates (POMs). The application first uses plasma electron sponge nanomaterial as functional material to make nanochannel composite membrane, and plasma electron sponge has excellent and stable performance, mild preparation condition, simple operation and green environmental protection. In addition, the plasma electron sponge nanochannel composite membrane prepared by the application can be used as ion selective membrane in salinity gradient energy conversion, and has the advantages of excellent and stable performance, high conversion power and green environmental protection.

The invention discloses a laser-induced breakdown spectroscopy analysis method and device based on parameter matching. The method comprises the following steps: acquiring a plurality of characteristic spectra; calculating the plurality of characteristic spectrums to obtain a plurality of plasma temperatures and a plurality of plasma electron densities corresponding to the calibration sample, and calculating to obtain a plasma temperature relative standard deviation and a plasma electron density relative standard deviation corresponding to the calibration sample; screening the plurality of plasma temperatures and the plurality of plasma electron densities to enable the corresponding relative standard deviations to meet preset conditions, and obtaining a screened plasma temperature subset and a screened plasma electron density subset; constructing characteristic spectrums corresponding to the screened subsets into characteristic spectrum subsets; and constructing a target characteristic calibration model based on the characteristic spectrum subset, wherein the target characteristic calibration model is used for calibrating a plurality of characteristic spectrums corresponding to the to-be-detected sample with unknown target characteristics. Therefore, the accuracy and precision of quantitative analysis on the sample can be improved.

The invention belongs to the technical field of laser cladding detection, and particularly relates to a spectral signal feature extraction and analysis method for a PDC drill bit cladding process, and the method comprises the steps: obtaining a real-time plasma spectrum sequence of the PDC drill bit cladding process through an optical fiber probe and a spectrometer; obtaining a spectral line effectiveness weight according to the intensity and the signal-to-noise ratio of a characteristic spectral line in the plasma spectrum sequence; obtaining an element fusion state index according to the spectral line effectiveness weight, the hard phase spectral line intensity and the binding phase spectral line intensity; the cladding quality stability is obtained according to the element fusion state index and the plasma electron density fluctuation; and performing cladding defect judgment on the PDC drill bit according to the cladding quality stability. According to the method, the spectral signal-to-noise ratio weight and the electron density fluctuation characteristics are fused, so that the interference of strong background noise on a monitoring result is effectively inhibited, and the accuracy of cladding layer component segregation and thermodynamic instability detection is improved.

The present application relates to the technical field of coal quality industrial analysis, and provides a coal quality industrial analysis method based on laser-induced breakdown spectroscopy characteristic peak selection set, comprising the following steps: data acquisition, using laser-induced breakdown experiment to collect coal sample spectrum data; data preprocessing, sequentially completing spectrum continuous radiation removal, local maximum value peak searching, characteristic peak selection, spectrum peak value fitting, and solving electron density and plasma electron temperature; quantitative analysis, taking standard coal sample test results as a training set, and using partial least square regression method to realize quantitative calculation of coal quality industrial analysis components of the sample; the present application can realize coal quality industrial quantitative analysis based on laser-induced breakdown spectroscopy, is suitable for the characteristic peak set of coal quality industrial analysis, and the integrated application of the method can achieve fitting degrees of sample ash content, volatile matter and fixed carbon all above 0.85.

This invention discloses a visible light bremsstrahlung diagnostic device and a method for measuring the electron density profile of fusion plasma. The visible light bremsstrahlung diagnostic device includes a vacuum chamber, an objective lens, an optical fiber, a spectrometer, and a spectral detector. The vacuum chamber is used to generate plasma and has an observation window. The objective lens, optical fiber, spectrometer, and spectral detector are sequentially connected to form an optical diagnostic system for observation. Accordingly, the front end of the objective lens faces the observation window, and the visible light bremsstrahlung of the plasma is observed through the observation window. The method for measuring the electron density profile of fusion plasma includes the following steps: S100 Measurement: Measuring the radiation of the plasma using the visible light bremsstrahlung diagnostic device; S200 Calculation: Calculating the plasma electron density profile using a formula. Compared with existing contact measurement methods, the visible light bremsstrahlung diagnostic device and the method for measuring the electron density profile of fusion plasma provide a non-contact, interference-free measurement method.

The application discloses an element concentration detection method based on laser-induced breakdown spectroscopy, and belongs to the technical field of laser spectrum analysis. The method comprises the following steps: acquiring plasma electron temperature, electron number density and element interference in LIBS of an unknown sample, and then acquiring energy and area of a plasma acoustic spectrum image corresponding to the unknown sample; inputting five features corresponding to the unknown sample into a mapping relationship to obtain a standard spectrum deviation, so as to correct an actual spectrum of a spectrum line to be corrected and obtain a corrected spectrum after elimination of a matrix effect; and finally, substituting the corrected spectrum into a calibration curve to obtain an element concentration after elimination of the influence of the matrix effect. The application summarizes main factors influencing spectral intensity due to the matrix effect, extracts features from LIBS and a plasma acoustic spectrum image, performs fitting and correction on the deviation of each spectrum, and has the advantages of clear physical meaning, no need for pretreatment, no need for complicated parameter adjustment, low cost and small amount of calculation compared with existing methods.

The invention discloses a multifunctional nanofluid hybrid membrane as well as a preparation method and application thereof. The hybrid membrane comprises a layer of self-assembled and arranged plasma electronic sponge membrane and a layer of membrane material with a macroporous structure, plasma nano particles in the plasma electronic sponge membrane are gold nano particles and are connected with ssDNA probes through Au-S bonds, the ssDNA probes comprise a probe 1 and a probe 2, the probe 1 is matched with protein on the surface of tumor-derived extracellular vesicles, and the probe 2 is complementarily paired with miRNAs released by the vesicles; and the electronic sponge is polyacid. The multifunctional nanofluid hybrid membrane disclosed by the invention can integrate capture and quantification of tumor-derived extracellular vesicles and in-situ detection of miRNAs released by the tumor-derived extracellular vesicles, is excellent and stable in performance, realizes multiple detection of tumor-derived extracellular vesicle biomarkers, and provides a new strategy with a wide prospect for efficient clinical diagnosis.

The utility model provides a detector of a polychromator, the polychromator, a plasma diagnosis system and a fusion reaction system.The detector comprises a first circuit board and a second circuit board, the first circuit board is fixedly provided with a photodiode and an amplifying circuit, the second circuit board is fixedly provided with a temperature control circuit, and the photodiode is integrated with a thermistor and a thermoelectric cooler; the output end of the photodiode is connected with the input end of the amplifying circuit; the thermistor and the thermoelectric cooler are electrically connected with the temperature control circuit through wires. By optimizing the circuit layout, the accuracy and stability of signal detection are remarkably improved, the problem that the quality of an amplified electric signal on an amplifying circuit is reduced due to electromagnetic interference and thermal noise is solved, and the accuracy of plasma electron temperature and electron density measurement is improved.

The application relates to a high-temperature plasma electron density primary device. The high-temperature plasma electron density primary device comprises a microwave interferometer diagnostic system, a helicon plasma generating device and a feedback control system, which can be organically combined, so that stable generation, high-precision measurement and automatic adjustment of a plasma electron density reference can be realized. Therefore, the high-temperature plasma electron density primary device can provide a stable and traceable plasma electron density reference for high-temperature plasma electron density diagnosis of a nuclear fusion device, reduce the system deviation of fusion triple product evaluation results, and realize accurate evaluation of fuel density in the fusion triple product based on unified metrology and calibration of the plasma electron density reference.

The invention discloses a short dipole probe antenna and method for high-precision measurement of plasma electron density, and belongs to the technical field of plasmas, and the short dipole probe antenna comprises two antenna arms which are fixed through insulating supports and are symmetrically arranged; the feed interface is positioned in the middle of the insulating support and is electrically connected with the two antenna arms; the short dipole probe antenna is connected with the feed interface through a transmission line; the length of the short dipole probe antenna is selected according to the frequency of the plasma, so that the characteristic impedance curve of the short dipole probe antenna in the plasma can be distinguished; the length of the short dipole probe antenna is set to be 1 / 50-1 / 10 of the radiation wavelength; the method is suitable for measurement of different plasma electron densities by modifying the length of the short dipole probe antenna. According to the invention, high-precision measurement of the ionized layer electron density is realized; the problem that the ionosphere electron density measurement precision is insufficient in the prior art is solved.

The application provides a multi-frequency microwave excited plasma electric heat thruster. It aims to solve the problem that the microwave cannot be effectively absorbed after the critical plasma electron density under the excitation of a single frequency microwave source. The thruster adopts a multi-port excitation system and a frequency band separation design, and is excited by a discontinuous microwave power source with different duty cycles, so that the output can be flexibly adjusted, the plasma density and uniformity in the time dimension of the discharge process can be accurately controlled, the waveguide system adopts a waveguide slot antenna to form a waveguide slot array, the energy distribution is adjusted by accurately controlling the slot position, inclination and size, and the microwave energy in the spatial dimension of the thruster is finely adjusted. The design effectively breaks through the microwave absorption efficiency bottleneck of single frequency excitation, reduces the interference between microwave sources, improves the coupling efficiency, ensures the effective transmission of microwave energy, further improves the plasma density and uniformity, and optimizes the overall performance of the thruster.

The application provides an EMC device and a production method thereof. The method comprises the following steps: dividing an in-situ plasma state monitoring area of a PECVD and sputtering process chamber, and generating plasma multi-parameter space distribution data; acquiring plasma electron density, excitation temperature and ion energy distribution data based on an OES spectrum real-time acquisition system, combining the plasma multi-parameter space distribution data to construct a dynamic process parameter mapping model, and deploying an intelligent regulation and control terminal to form a closed-loop control network; through the in-situ plasma state monitoring and the closed-loop control network, the adaptability of the production process to plasma state drift and material batch difference is greatly improved, the process parameters can be accurately adjusted in real time, and the flexibility and stability of production are enhanced.

The invention provides a gas discharge plasma synchronous multi-probe diagnosis device and method, and relates to the technical field of plasmas, and the device comprises a plasma excitation module, a scanning signal generation module, a probe assembly, a signal adjustment module and a signal detection module. The plasma excitation module is used for generating and maintaining plasma in the discharge space; the plurality of measuring probes are connected in parallel with the scanning signal generation module through the corresponding detection resistors so as to form a parallel measuring channel; a multi-channel synchronous acquisition system of the signal detection module ensures that all space measuring point data strictly correspond to a plasma state at the same moment from physical connection; plasma diagnosis is promoted from a traditional'single-point and slow-speed 'mode to a'multi-point and fast' mode. Space and time errors caused by time-sharing measurement are eliminated, and the real space distribution form of the plasma electron energy distribution function at a certain moment can be accurately obtained.

This invention discloses a method for recovering lanthanum, cerium, and zirconium from the tailings of a three-way catalyst, belonging to the field of metal recovery technology. The method includes the following steps: (1) grinding, sieving, and drying the tailings of the three-way catalyst; (2) ball milling in a plasma ball mill jar; (3) adding the ball-milled activated powder to a mixed acid solution and stirring to leach; (4) adding sodium hydroxide solution and stirring to adjust the pH value to generate a precipitate; (5) adding a high-concentration sodium hydroxide solution and stirring to adjust the pH value to generate a precipitate, filtering, adding magnesium powder, and stirring to carry out a displacement reaction to generate zirconium precipitate. This invention utilizes the synergistic effect of high-energy plasma electrons and mechanical impact force to accelerate the refinement, increase the specific surface area, and activate the activity of the tailings powder of the three-way catalyst. Simultaneously, it induces thermal stress to promote material breakage. This method significantly shortens the leaching time of lanthanum, cerium, and zirconium and significantly improves their recovery rates, achieving recovery rates of up to 99.98%, 99.97%, and 99.98%, respectively.

The invention discloses a nuclear fusion device edge plasma electron density and temperature diagnosis system and method. Relates to the technical field of spectrum diagnosis. On one hand, the structure of a nuclear fusion device edge plasma electron density and temperature diagnosis system is improved, spatial isolation is achieved between light energy needing to collect a spectrum band and light energy not needing to collect the spectrum band based on a light splitting system comprising an upper layer channel and a lower layer channel, interference of background stray light is reduced, and the detection accuracy is improved; the signal-to-noise ratio can be effectively improved; on the other hand, a nuclear fusion device edge plasma electron density and temperature diagnosis method is improved, the electron density and the electron temperature are measured based on the ratio of four visible spectrums of HeI of a neutral helium atom spectral line, and the spatial resolution of the plasma electron density and the temperature result is improved.

The application discloses a LIBS trace element detection method and system driven by physical and data hybrid, and belongs to the technical field of spectral analysis. The method comprises the following steps: acquiring plasma electron temperature and electron density of a target element in LIBS, identifying, reconstructing and interval spectrum optimizing a specific spectral line, fusing multi-modal information such as optimized LIBS data, plasma physical parameters, experimental setting parameters and observation conditions, constructing a hybrid quantitative model of physical mechanism and data driving by using a physical information neural network, embedding Saha-Boltzmann graphic information, combining ResNet-Transformer feature extraction and Bootstrap-Dropout uncertainty quantification, effectively overcoming interference such as LIBS matrix effect, spectral line aliasing and self-absorption, and significantly improving the precision, stability and generalization ability of trace element detection.

The present invention relates to an apparatus for processing an object (O) comprising: an activator (A) for activating a precursor gas (P) to generate a component (C) from the precursor gas; a guide (G) for providing the component locally on the object; a beam unit (BU) for providing a particle (B) beam on the object. Further aspects relate to an according method and computer program.

The application discloses a plasma parameter transient terahertz wave transmission testing device, method and system, and relates to the technical field of plasma transmission testing.The device comprises a first microwave darkroom, a measured device, a second microwave darkroom, a vector network analysis module and an industrial computer, and the measured device is provided with plasma;the first microwave darkroom is provided with a first spread spectrum module, a transmitting horn antenna and a first lens, the second microwave darkroom is provided with a second spread spectrum module, a second lens and a receiving horn antenna, the transmitting horn antenna is connected with the first spread spectrum module, the receiving horn antenna is connected with the second spread spectrum module, and the vector network analysis module is connected with the first spread spectrum module, the second spread spectrum module and the industrial computer.The application obtains the terahertz wave transmission signal passing through the plasma, inverts the key parameters of plasma electron density and collision frequency, improves the accuracy of the model, does not need to intrude into the plasma, and is suitable for different processes and various application scenarios.

The application discloses a high-spatial-resolution far-infrared laser interferometer and relates to the technical field of optical interferometers.The high-spatial-resolution far-infrared laser interferometer comprises an optical platform, an optical tower, an optical support and a phase comparator system, the optical platform is fixedly provided with a far-infrared laser light source, a heterodyne interferometer table light path, a single-point frequency mixer and a linear array frequency mixer, the far-infrared laser light source comprises a first far-infrared light source and a second far-infrared light source, the light signal transmitting ends of the first far-infrared light source and the second far-infrared light source are connected with the heterodyne interferometer table light path, the far-infrared laser light emitted by the two far-infrared light sources enters the single-point frequency mixer through the interferometer table light path, the linear array frequency mixer is used as a detection channel frequency mixer and is used for receiving the signals emitted by the two sources, and the application realizes the system layout of multi-position detection under a single detection channel light path and provides a reliable measurement tool for high-spatial-resolution measurement of plasma electron density.

The application relates to a plasma flow field electron density distribution electromagnetic correction method, and relates to the electromagnetic correction field, and comprises the following steps: simulating the electron density of a model surface, and taking the simulated flow field electron density distribution as a basic distribution; inverting a correction function through the RCS measurement result of an observation point; expanding the correction function at the original point into a Taylor series to obtain the correction function; multiplying the correction function and the basic distribution at any position to obtain the correction value of the electron density at the any position; and the optimal individual screened out by a genetic algorithm is the inversion correction result, so that the simulation result of the plasma flow field electron density distribution can be corrected after the known target shape, the simulation result of the plasma flow field electron density distribution, the change amount of the RCS of the target within a limited azimuth angle and a limited frequency point after being affected by the plasma, and the accuracy of the simulation result of the plasma electron density is further improved.