Accession Number : AD0855691

Title :   Optical Methods of Measuring Plasma Jet Temperatures. Part III. Interpretation of Photoelectric Pyrometric Measurements.

Descriptive Note : Technical documentary rept. Sep 61-30 Nov 62,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE FUELS RESEARCH LAB

Personal Author(s) : Hottel, H. C. ; Williams, G. C. ; Dundas, P. H.

Report Date : MAR 1963

Pagination or Media Count : 72

Abstract : 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-gray/gray 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 (5890/5896A). The measured temperatures agree to within 1.6% of the enthalpy temperatures calculated from an energy balance over the whole system. (Author)

Descriptors :   *PLASMA JETS), (*PHOTOELECTRIC PYROMETERS, (*REENTRY VEHICLES, PLASMA JETS), ARGON, AIR, OPTICAL ANALYSIS.

Subject Categories : Test Facilities, Equipment and Methods
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE