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prepared on an Al evaporated, reflecting glass surface, were chosen for experiment. When examined by a pyroelectric IR sensor, a relationship which includes a differential coefficient may be established between the radiance and the temperature of the film. The differential coefficient may be compared with that of blackbody radiation. The comparison has given the value of ƒÃ as a function of d, and the absorption coefficient to be 7.24•~10-3 ƒÊ m-1. The dependency of ƒÃ on d thus obtained is consistent with the formulation developed here after McMahon's theory of radiant characteristics of the partially transparent films.

Thermal Emissivity of Freely Radiating Body with Partially Transparent Surface Layer