Accession Number : ADP002743

Title :   Techniques for Measuring Radiance in the Air and Sea,

Corporate Author : TETRA TECH INC PASADENA CA

Personal Author(s) : Wells,W. H.

Report Date : AUG 1983

Pagination or Media Count : 17

Abstract : Measurements of scattered sunlight often employ simple radiometers that are incapable of scanning azimuth phi and zenith angle theta. Instead, they measure integral moments of the radiance. Consider a set of N+1 meters designed to measure moments lambda(1) through lambda N+1. If each meter is judiciously designed, then the lambda(j) may be processed quite simply to deduce inherent properties of the scattering medium, namely N moments of the volume scattering function. In the optimum design, each meter has an angular response that approximates a polynomial of degree N in cos theta. The theory of these meters is based on Boltzmann's equation of radiative transfer expressed in terms of spherical harmonics, a form in which this equation is particularly simple. (Author)

Descriptors :   *Radiometers, *Remote detectors, *Sea water, *Surface properties, *Optical properties, *Radiative transfer, Boltzmann equation, Light scattering, Azimuth, Air, Integrated systems, Response, Volume, Measurement, Optimization, Sunlight, Functions, Scattering, Scanning, Polynomials, Moments, Angles

Distribution Statement : APPROVED FOR PUBLIC RELEASE