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Techniques for Measuring Radiance in the Air and Sea,
TETRA TECH INC PASADENA CA
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 N1 meters designed to measure moments lambda1 through lambda N1. If each meter is judiciously designed, then the lambdaj 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 Boltzmanns equation of radiative transfer expressed in terms of spherical harmonics, a form in which this equation is particularly simple. Author
This article is from 'Propagation Factors Affecting Remote Sensing by Radio Waves,' AD-A137 559, p44-1-44-17.