Abstract

To quantitatively measure the ambient radiation reflected by a target, in an earlier paper [ Zhang, et al., Appl. Opt. 25, 3683– 3689 ( 1986)] we presented the equivalent blackbody radiation theory. In this paper we give a theoretical demonstration of that theory and generalize it from the case of an opaque body to the case of a semitransparent body. Several methods are proposed to measure the transmittance, the emissivity, the reflectance, and the true temperature of an opaque or semitransparent body. Good quantitative experimental results are obtained.

© 1989 Optical Society of America

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