Method for measuring dual-jet direct-current arc plasma space temperature field in real time

Abstract

The invention provides a method for measuring a dual-jet direct-current arc plasma space temperature field in real time, and belongs to the technical field of hot plasma temperature measurement. The method is characterized in that in a real-time measurement system, internal and external parameters of given cameras are worked out, calibration and stereo correction are conducted, two matched target images preprocessed through a set parallax deviation are obtained, the intensities of spectral lines on corresponding pixel points at the same moment are obtained from a spectrograph, a gray value-spectral line intensity mapping table is built, and the electron excitation temperature of a spatial point corresponding to the similar spectral lines is calculated through the relative intensities of the spectral lines, wherein the real-time measurement system is composed of a plasma generator, an image information acquisition device, a spectrum acquisition device and a computer, the image information acquisition device is formed by splicing the two CCD cameras, optical filters with different central wavelengths are arranged in front of lenses on the two sides, the spectrum acquisition device is mainly composed of the spectrograph, and the computer is connected with a triggering signal output card used for synchronously triggering the two CCD cameras and the spectrograph. The method is simple and feasible, the resolution ratio and temperature measurement accuracy are high, and dynamic performance is good.

Description

technical field [0001] The invention relates to a real-time measurement method for double-jet DC arc plasma temperature, which belongs to the field of thermal plasma temperature measurement. Background technique [0002] Based on the high temperature characteristics of thermal plasma, commonly used temperature diagnosis methods can be divided into probe method and emission spectroscopy method. The experimental equipment required by the probe method is simple and easy to operate, but it has the following disadvantages: the spatial resolution is low; the measurement temperature range is narrow; the temperature of unsteady objects cannot be measured well; Plasma, the reaction speed cannot meet the real-time requirements; the contact with the measured object will also affect the temperature field distribution of the thermal plasma to a certain extent. [0003] When using emission spectroscopy to measure temperature, it is usually assumed that the plasma satisfies the local ther...

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Problems solved by technology

The experimental equipment required by the probe method is simple and easy to operate, but it has the following disadvantages: the spatial resolution is low; the measurement temperature range is narrow; the temperature of unsteady objects cannot be measured well; Plasma, the reaction speed cannot meet the real-time requirements; the contact with the measured object will also affect the temperature field distribution of the thermal plasma to a certain extent

[0005] In the actual radiation imaging system, the lens group, optical glass, filter and other optical devices are often loaded in front of the CCD sensor, and it is difficult to achieve a strictly proportional relationship between the intensity of the spectral line and the gray level of the image.

It is relatively simple to calibrate the gray value and temperature by using the absolute intensity method of spectral lines, but the temperature measurement accuracy is low

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