EXPERIMENTAL MEASUREMENT OF THE EMISSION AND ABSORPTION OF RADIATION BY AN ARGON PLASMA

A thermistor bolometer was used to obtain spatially resolved measurements of the total radiation of an argon plasma in the spectral ranges of 0.2 to 3.5 microns and 0.2 to 22 microns. The measurements were correlated with temperature at pressures of 0.5, 1.0 and 2.0 atmospheres. The use of a free bu...

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Bibliographic Details
Main Authors: Evans,D L, Tankin,R S
Format: Report
Language:English
Subjects:
ARGON
ENERGY
JET FLOW
MEASUREMENT
Plasma Physics and Magnetohydrodynamics
PLASMAS(PHYSICS)
THERMAL RADIATION
Thermodynamics
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Summary:A thermistor bolometer was used to obtain spatially resolved measurements of the total radiation of an argon plasma in the spectral ranges of 0.2 to 3.5 microns and 0.2 to 22 microns. The measurements were correlated with temperature at pressures of 0.5, 1.0 and 2.0 atmospheres. The use of a free burning arc as a source allowed measurements at temperatures from 10,000 to 26,000K. Spectroscopic measurements and the well known Fowler-Milne technique were used to determine the temperature. For the one atmosphere case, absorption measurements were made so that the emission results could be corrected for absorption. Corrections for the ultraviolet radiation were also made and results are compared with existing theories and data. Measured values agree well with those made by Avco while corrected values are close to those of Emmons. The 6965.43 AI line was also studied. Line shifts, 1/2-halfwidths, absorption coefficients and emission coefficients were measured. Transition probabilities from both emission and absorption studies are found to be in agreement. The value obtained is within the experimental error of Olsen. (Author)