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Abstract
A simple optical system has been designed for making spatially resolved measurements of the emission and self-absorption of an extended radiator. The system, which is a highly efficient collector of radiation, isolates a conical region extending through the radiating body. If the radiator is uniform along the line of sight, no mathematical inversion is required to determine the local emission and absorption coefficients. Since the isolated region is the radiation source for measuring its own absorption, source and absorber are identical, and the analysis for wavelength dependent absorption is simplified. The system can also be used for making spatially resolved measurements of the absorption of externally generated radiation. This paper describes the basic concept as well as an instrument containing only reflection optics that has been constructed for measuring radial profiles of radiative properties of a gas discharge plasma.
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