A non-contact measurement system of nozzle arc temperature based on optical fiber transmission

Abstract

A non-contact measurement system for nozzle arc temperature based on optical fiber transmission, including an optical collection and processing system, a photoelectric conversion system, and a data processing unit. The invention utilizes optical fiber sensing technology combined with optical signal processing devices to modulate and detect characteristic parameters of light waves transmitted in optical fibers, and realizes dynamic measurement of temperature physical quantities. It has excellent beam quality, strong anti-interference ability, compact and integrated structure, high measurement accuracy, and The arc field has the advantages of no disturbance, safety and reliability, and fast dynamic response, which overcomes the problem of difficult sampling of optical signals in the nozzle; uses adjustable optical attenuators to realize real-time control of dynamic saturation of optical signals and adjustment of dynamic gain balance; wavelength division multiplexing The monochromatic beams of different characteristic wavelengths are separated by a device, and the integration is high; the infrared radiation temperature measurement method and the visible spectrum temperature measurement method are combined, and the digital processing unit is used to calculate the arc temperature through the relative spectral line intensity method, expanding the dynamic measurement range and Improve the dynamic response speed of the measurement.

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...

AI Technical Summary

Problems solved by technology

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

Therefore, spectroscopic diagnostic methods cannot be used when measuring the temperature distribution in the thermal boundary zone outside the arc column

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