Accession Number : AD0436839

Title :   INFRARED TRANSMISSION STUDIES. VOLUME I. SPECTRAL BAND ABSORPTANCE FOR ATMOSPHERIC SLANT PATHS,

Corporate Author : PHILCO NEWPORT BEACH CALIF AERONUTRONIC DIV

Personal Author(s) : Plass,Gilbert N.

Report Date : 02 AUG 1962

Pagination or Media Count : 42

Abstract : A number of equations are derived for the absorptance along a slant path. Various combinations of assumptions are made in the derivation of these equations as to the variation of the temperature and absorber concentration along the path, the extent and nature of the overlapping of the spectral lines, the variation of the intensity and half-width from line to line, the shape of the spectral lines, and the extent of the frequency interval considered. The assumptions are clearly stated for each result. A general method is developed for obtaining slant path absorptances from homogeneous path data when either the weak or strong line approximation is valid. When these equations which are valid in the weak and strong line limits are simultaneously satisfied, new general expressions are obtained for slant path absorptance which are correct in both of these limits and provide a good approximation for all values of the parameters. (Author)

Descriptors :   (*INFRARED SPECTROSCOPY, WAVE PROPAGATION), ABSORPTION SPECTRA, MEASUREMENT, BESSEL FUNCTIONS, MATHEMATICAL MODELS, LINE SPECTRA, EQUATIONS, GASES, TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE