Nozzle arc temperature non-contact measurement system based on optical fiber transmission

A technology of non-contact measurement and arc temperature, which is applied in the field of arc temperature optical measurement system, can solve the problems that the spectral diagnosis method cannot be used, and achieve the effect of being free from electromagnetic interference, realizing real-time control, and high technical content

Inactive Publication Date: 2014-06-25
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

However, in the thermal boundary region outside the arc column, this condition is not satisfied
Therefore, spectroscopic diag

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  • Nozzle arc temperature non-contact measurement system based on optical fiber transmission
  • Nozzle arc temperature non-contact measurement system based on optical fiber transmission
  • Nozzle arc temperature non-contact measurement system based on optical fiber transmission

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specific Embodiment approach

[0039] The workflow of the whole measurement system is as follows: figure 1 As shown, including optical acquisition and processing system (fiber detection array, adaptive adjustable attenuator, multiple wavelength division multiplexer), photoelectric conversion system (multi-channel photon detector, signal conditioning circuit), data processing unit and computer system . The optical acquisition and processing system realizes optical power adjustment and monochromatic characteristic light splitting selection, and the photoelectric conversion system converts multiple optical signals into electrical signals, and performs filtering and signal processing. The data processing unit (high-speed A / D conversion circuit, FPGA and DSP joint structure) realizes the calculation of the arc temperature by using the optical radiation intensity of the characteristic wavelength, and communicates to the computer system through USB data, and realizes the result by the upper computer software of t...

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Abstract

A nozzle arc temperature non-contact measurement system based on optical fiber transmission comprises an optical acquisition and processing system, a photoelectric converting system and a data processing unit. According to the nozzle arc temperature non-contact measurement system based on the optical fiber transmission, the optical fiber sensing technology is combined with optical signal processing device modulation and detection of optical wave characteristic parameters in the optical fiber transmission to achieve dynamic measurement on temperature physical quantity, and the system has the advantages of being good in beam quality, strong in anti-interference capacity, compact and compositive in structure, high in measurement precision, free of disturbance on arc fields, safe, reliable, fast in dynamic response speed and the like, and the problem that optical signals in a nozzle are difficult to sample is solved. Real-time control over dynamic saturation of optical signals and adjustment of dynamic gain balance can be achieved by using a variable optical attenuator. Monochromatic light beams of different characteristic wavelengths are separated through a wavelength division multiplexer, and an integration level is high. An infrared radiation thermometry and a visible spectrum thermometry are combined, the arc temperature is obtained by adopting a digital processing unit through operation of a relative spectral line intensity method, a dynamic measurement range is enlarged, and the dynamic response speed of measurement is improved.

Description

technical field [0001] The invention relates to an arc temperature optical measurement system combining optical fiber sensing technology and spectral radiation theory, which is especially suitable for non-contact measurement of arc plasma dynamic temperature at nozzles of jet thrusters, arc plasma torches, high-voltage circuit breakers and other devices. Measurement. Background technique [0002] Arcing is a self-sustaining discharge phenomenon that can exist independently. Among them, the method of generating arc plasma by discharge in the Laval nozzle is widely used in the fields of aerospace power propulsion, surface material processing and preparation, and power fault current interruption. A Rafal spout is an axisymmetric spout with typical constricting, constraining, and diverging segments. Due to the difference in the application background, its manufacturing materials are also different. There are two most common types: the side wall of the spout doubles as the disc...

Claims

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Application Information

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IPC IPC(8): G01K11/32
Inventor 王伟宗王思佳刘波史也林晴晴
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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