Method for measuring long clearance air arc-plasma temperature

Abstract

Provided is a method for measuring temperature of long-gap air arc plasma, relating to heat plasma temperature measurement field. The method is based upon spectrum diagnosis principle of air arc plasma radiation, shooting long-gap air arc image through an attachment double-narrow-band-pass filter and a calibrated color CCD high speed image acquisition system, and storing in BMP format which data is not compressed; correcting pixel value of arc color bitmap file responded with two feature center wavelengths to original data of arc radiation intensity; obtaining arc radial light intensity distribution through Abel transformation, then calculating arc plasma projection temperature distribution or arc plasma temperature radial distribution by a colorimetry of spectrum relative intensity, and rebuilding tridimensional temperature field. The method of the present invention can measure open arc plasma temperature in air of several meters accurately and provides an important plasma parameter for researching microcosmic mechanism of long-gap air arc.

Description

technical field [0001] The invention relates to a method for measuring the temperature of long-gap air arc plasma, which belongs to the field of thermal plasma temperature measurement. Background technique [0002] The temperature of the air arc plasma is high, the heat capacity limit of the probe or thermocouple is difficult to meet the requirements, and the contact probe will interfere with the temperature field of the measured arc, so the non-contact method is usually used to measure the arc plasma temperature. [0003] At present, infrared temperature measurement technology has been widely used in the field of non-contact temperature measurement. The continuous spectrum of air arc plasma radiation mainly covers the visible light region, while the response wavelength of the infrared thermal imager is far beyond the wavelength range of the arc plasma radiation. High, high radiation energy, may damage the infrared lens. In addition, the spectrometer, which obtains the arc...

AI Technical Summary

Problems solved by technology

However, since the CCD response curve is limited by the bandwidth, and the plasma radiation signal will introduce errors after various transformations of the image acquisition system, the direct use of the colorimetric temperature measurement method has a large measurement error, and reducing the error is One of the main difficulties of this temperature measurement technique

At the same time, the color CCD image is the projection (integral value) of the three-dimensional radiation space of the arc on the two-dimensional CCD target surface. temperature field

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