STUDY OF VARIOUS METHODS OF DETERMINING THE TEMPERATURE OF A PLASMA IN A MHD DUCT,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The authors report on experimental measurements of the temperature of a plasma consisting of combustion products in an MHD duct. The measurements were made by a number of different methods absolute spectral line intensity recording sodium line reversal a generalized method of spectral line inversion and dynamic thermocouple. The experimental set-up consisted of an oxy-acetylene combustion chamber and a small MHD duct. The conditions under which the measurements were made were similar to those in large experimental facilities. Using the above methods, the authors compared the results of simultaneous temperature measurements for different combustion chamber operating conditions depending on the amount of line indicator and the quantity of seed. By measuring the temperature in a given region of the plasma by the generalized method of the sodium line reversal and by means of a dynamic thermocouple it was possible to estimate the accuracy of the thermocouple. With the help of the dynamic thermocouple the temperature was also determined as a function of distance from the duct axis. In order to compare the accuracy of the spectral methods of temperature measurement, the authors examined spectrograms obtained in the 4000-7000A region and measured the spectral line contours by means of a Fabry-Perot interferometer.
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