Accession Number : ADA187071

Title :   Christiansen Effect in Infrared Spectra of Soil-Derived Atmospheric Dusts.

Descriptive Note : Technical rept. Jan 79-Dec 82,

Corporate Author : CHEMICAL RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD

Personal Author(s) : Carlon, Hugh R

PDF Url : ADA187071

Report Date : Sep 1987

Pagination or Media Count : 31

Abstract : The Christiansen effect occurs when a suspension of particles in a transparent medium is observed at a wavelength where the refractive indices of the particles and of the medium are equal, thus producing an optically homogeneous medium with optical bandpass or filter characteristics. It is shown that soil-derived atmospheric dusts and other particulates can exhibit the Christiansen effect at IR wavelengths and that their spectra can be simulated by equivalent, precipitated films of the particulates on optical substrates. Useful approximation equations are given. The implication of these observations should be considered by atmospheric physicists and IR system designers.

Descriptors :   *ATMOSPHERES, *DUST, EQUATIONS, FILTERS, INFRARED SPECTRA, OPTICAL MATERIALS, OPTICAL PROPERTIES, PARTICLES, PARTICULATES, REFRACTIVE INDEX, SUBSTRATES, SUSPENSION DEVICES, TRANSPARENCE

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE