Optical Methods of Measuring Plasma Jet Temperatures. Part III. Interpretation of Photoelectric Pyrometric Measurements.
Technical documentary rept. Sep 61-30 Nov 62,
MASSACHUSETTS INST OF TECH CAMBRIDGE FUELS RESEARCH LAB
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A photoelectric pyrometer has been designed and used to measure the temperature of a one atmosphere argon plasma jet over the range 4000K - 8500K. The jet which was virtually transparent normally was partially opacified with sodium, a non-gray temperature probe, and temperature measurements were based on the application of a non-graygray brightness matching theory to a modified two-path optical temperature measuring technique. The pyrometer was designed to detect uniquely the spectral radiation from the added sodium and to match the brightness of this radiation with that of gray radiation, from a calibrated filament. The brightnesses were matched at one cycle-second and observed over the narrow waveband 8A of an interference filter centered on the D-line doublet of sodium 58905896A. The measured temperatures agree to within 1.6 of the enthalpy temperatures calculated from an energy balance over the whole system. Author
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- Unmanned Spacecraft