Abstract

This paper is a review of the theories of cavity-type radiant-energy sources that have properties approaching those of blackbodies. Sources having highly emissive walls are distinguished from light wells, which have highly reflective walls. Certain theorems, which are aids in generalizing for forms other than simple geometrical shapes, are proved. The theories of Buckley, Gouffé, and De Vos are reviewed individually. The approximation involved in each theory is noted and the method appraised. Relationships for several cavity shapes are derived for computing the effective emissivity of the source in terms of dimensions of cavity, emissivity of walls lining the cavity, and aperture size.

© 1961 Optical Society of America

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