A metal vapor concentration measurement system for spout arc ablation based on optical fiber sensing
A technology for metal vapor and concentration measurement, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problem of difficult direct contact measurement of arc concentration at the nozzle, and achieve modular design, high measurement accuracy, and improved The effect of dynamic response speed
Inactive Publication Date: 2016-03-30
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology
[0007] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a metal vapor concentration measurement system based on optical fiber sensing for arc ablation at the nozzle, which solves the problem that the concentration of the arc at the nozzle is difficult to measure directly, and the measurement accuracy and reliability High performance, excellent dynamic response characteristics
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[0036] Such as figure 1 As shown, the nozzle arc ablation metal vapor concentration measurement system based on optical fiber sensing includes dynamic pressure measurement module, optical acquisition and processing system (data calculation system composed of high-speed A / D conversion circuit, FPGA and DSP), photoelectric conversion system, A data processing unit and a computer system. The optical acquisition and processing system includes an optical fiber detection array, an adjustable optical attenuator, and a wavelength division multiplexer; the photoelectric conversion system includes a multi-channel photodetector and a signal conditioning circuit. The calculation of arc temperature and metal vapor concentration is realized by using the light radiation intensity of the characteristic wavelength, and the data is communicated to the computer system through USB, and the results are displayed and stored by the upper computer software of the data storage and management system. ...
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The invention provides an optical fiber sensing-based measurement system for the concentration of electric arc ablation metal vapor of a nozzle. The measurement system comprises an optical acquisition and processing system, a photoelectric converting system, a data processing unit and a dynamic pressure measurement module. According to the measurement system, an optical fiber sensing technology is combined with an optical signal processing device to be used for modulating and detecting transfused optical wave characteristic parameters in optical fibers. The acquisition of optical signals is finished by an optical fiber detection array capable of being reliably nested with the nozzle; a one-dimensional pressure sensor array is used for measuring dynamic distribution of inner pressure of the nozzle; the data processing unit is used for operating by adopting an emission spectrum relative spectral line intensity method to obtain an electric arc plasma temperature so as to further calculate to obtain a single dependence relation of an electric arc light radiation coefficient and the concentration of the metal vapor under a certain temperature and a certain air pressure; the reverse interpolation is carried out to obtain the distribution of the concentration of the metal vapor in electric arc plasmas. The measurement system is good in light beam quality, strong in anti-jamming capability, compacted and integrated in structure, reliable in performance, high in measurement precision and high in dynamic responding speed, and has no disturbances on an electric arc field.
Description
technical field [0001] The invention relates to a nozzle arc ablation metal vapor concentration measurement system based on optical fiber sensing, which is especially suitable for monitoring the dynamic distribution of arc ablation metal vapor concentration in closed nozzles such as jet electric thrusters, arc plasma spray guns, and high-voltage circuit breakers. contact measurement. Background technique [0002] The method of generating arc plasma by discharge in the Laval nozzle is widely used in the fields of aerospace power propulsion, power fault current interruption, and surface material processing and preparation. The Rafal spout is an axisymmetric spout with a typical contraction section, confinement section and expansion section. There are two most common types: the sidewall of the spout doubles as the discharge anode and the sidewall of the spout is made of insulating material (respectively as figure 2 , image 3 shown). The former is widely used in devices such...
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IPC IPC(8): G01N21/00
Inventor 王伟宗于源王磊孙威薛明
Owner CHINA ACADEMY OF SPACE TECHNOLOGY