Accession Number : ADA017708

Title :   Development of an Electronics Package for use in Real Time, Optically Thin, Isothermal Spectral Line Intensity Ratio Temperature Measurements.

Descriptive Note : Interim technical rept. Mar 73-Jan 74,

Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Baust,Henry D. ; Bader,Jon B.

Report Date : JUN 1975

Pagination or Media Count : 73

Abstract : An analog electronics package (or calculator) has been constructed which calculates in real time the temperature of an isothermal region (slab) of copper contaminated equilibrium air from the intensity ratio of two optically thin copper spectral lines. This calculator is capable of being used for temperature measurements in the range of 3000 to 10,000 K while using the intensity ratio of the 5106/5153A copper atomic lines. The basic design takes into account the possibility of a significant background (i.e., continuum) intensity in the neighborhood of the copper spectral lines. For a given nominal temperature setting, the package possesses simultaneously a response time of 1 to 2 microsec, accepts temperature variations of + or - 20%, accepts absolute intensity changes in the 5106 spectral line of one order of magnitude, and still maintains a calculated temperature accuracy of + or - 3%. While the present emphasis has been placed on the use of the 5106/5153A copper atomic lines in the temperature range of 3000 to 10,000 K, the calculator can be applied to any isothermal slab of gas which possesses a species with a suitable pair of optically thin spectral lines. (Author)

Descriptors :   *Calculators, *Signal processing, *Temperature, Spectroscopy, Analog systems, Atomic spectroscopy, Modules(Electronics), Real time, Measurement, Copper, Line spectra, Reentry vehicles, Enthalpy

Subject Categories : Electrical and Electronic Equipment
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE