Method for measuring long clearance air arc-plasma temperature

An arc plasma and plasma technology, which is applied in the field of plasma temperature measurement, can solve the problems of inability to characterize the light intensity distribution of arc cross-section, inability to obtain temperature field, large measurement error, etc. Accurate and flexible effects

Active Publication Date: 2008-11-12
CHINA ELECTRIC POWER RES INST +1
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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...

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  • Method for measuring long clearance air arc-plasma temperature
  • Method for measuring long clearance air arc-plasma temperature
  • Method for measuring long clearance air arc-plasma temperature

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Embodiment Construction

[0033] Embodiments of the present invention will be described below in conjunction with the accompanying drawings and specific examples.

[0034] figure 1 The overall structure of the measurement system made according to the present invention is mainly composed of long gap air arc generator, optical preprocessing device, color CCD high-speed image acquisition system and long gap air arc temperature calculation software. The long-gap air arc generator generates arc plasma to form an open arc with a length of 0.1-5m, a duration of 2s, and free movement in the atmosphere. The optical preprocessing device includes a neutral filter and two narrow-band filters, the neutral filter is optically neutral, the attenuation coefficient is constant in the full wavelength range, and the light intensity attenuation ratio is 8 / 1; the first The central wavelength λ1 of the narrow-band filter is 632.8nm, the half-peak bandwidth is 16nm, and the transmittance is 55%; the central wavelength λ2 of...

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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...

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Application Information

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IPC IPC(8): G01J5/00G01J5/50
Inventor 颜湘莲陈维江
Owner CHINA ELECTRIC POWER RES INST
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