Accession Number : ADA188213

Title :   Depolarized Infrared Reflectance from Dry and Wetted Surfaces.

Descriptive Note : Technical rept. Dec 85-Nov 86,

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

Personal Author(s) : Carrieri, Arthur H ; Ditillo, John T ; Schlein, Mark S

PDF Url : ADA188213

Report Date : Sep 1987

Pagination or Media Count : 23

Abstract : Backscattering of the carbon dioxide laser was measured from soil, sand, concrete, asphalt, and military-specified painted metal plates before and after contamination by an infrared-absorbing liquid. Sensitivity of the 9- to 11-micron volume reflectance spectra to the targeted liquid contamination differed significantly between porous and nonporous scattering surfaces, indicating that diffusion of liquid the material bulk, not resonant absorption of the probe laser by the liquid, dictates direct detection sensitivity thresholds. Keywords: Intermediate infrared radiation; Depolarized radiance; Isotropic radiance; Dielectric surface; Light scattering; Infrared detection; Targeted liquid contamination.

Descriptors :   *INTERMEDIATE INFRARED RADIATION, *REFLECTANCE, ASPHALT, BACKSCATTERING, CARBON DIOXIDE LASERS, CONCRETE, CONTAMINATION, DETECTION, DIELECTRICS, DIFFUSION, INFRARED DETECTION, ISOTROPISM, LASERS, LIGHT SCATTERING, LIQUIDS, PROBES, RADIANCE, RESONANCE ABSORPTION, SAND, SCATTERING, SENSITIVITY, SURFACES, THRESHOLD EFFECTS, WETTING, SOILS, PAINTS, DECONTAMINATION MATERIALS, DEPOLARIZATION, DRY MATERIALS

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE