Accession Number : AD0621496

Title :   A BAND-RATIO TECHNIQUE FOR DETERMINING TEMPERATURES AND CONCENTRATIONS OF HOT COMBUSTION GASES FROM INFRARED-EMISSION SPECTRA,

Corporate Author : GENERAL DYNAMICS/ASTRONAUTICS SAN DIEGO CALIF SPACE SCIENCE LAB

Personal Author(s) : Ferriso,C. C. ; Ludwig,C. B. ; Boynton,F. P.

Report Date : 1965

Pagination or Media Count : 15

Abstract : An infrared-band-ratio technique (BRT) was developed by which infrared emission spectra from various bands of H2O and CO2 in the 1-micron to 3.5-micron spectral region are used to determine the temperature and concentration ratio (CO2)/(H2O) of hot gases. BRT is based on the observation that the integrated intensities of various H2O and CO2 bands are temperature dependent and that emission in the 2.7-micron spectral region is due to both H2O and CO2. Although BRT is applicable to any molecule, the working curves obtained only for H2O and CO2, as an example of the method. The original technique is extended to include emission from a continuum source; moreover, working curves are given for small carbon particles in the hot-gas sample. The carbon work is based on a specific model for the absorption coefficient as a function of temperature and wavelength. The technique was applied to hotgas systems, where the temperatures and concentrations are known from an independent experiment, and the agreement with those values found by BRT is very good. (Author)

Descriptors :   (*COMBUSTION PRODUCTS, INFRARED SPECTROSCOPY), (*INFRARED SPECTROSCOPY, BAND SPECTRA), TEMPERATURE, GASES, WATER, CARBON DIOXIDE, EMISSIVITY, MOLECULAR SPECTROSCOPY

Distribution Statement : APPROVED FOR PUBLIC RELEASE