Abstract

Because of the lack of theory and methods of measuring the ambient radiation in real situations, it is impossible to quantify the self-radiation properties of a target. Our earlier paper, (13) proposed a theory, “Equivalent Blackbody Radiation Theory,” and a design method for infrared systems that can measure quantitatively the ambient radiation and self-radiating properties of opaque targets. We now extend our treatment to the more general case which includes opaque, semi-transparent and transparent objects. As examples, the ambient radiation in different situations, the self-radiation properties of an opaque metal plate and a semi-transparent crystal, and the true temperature difference of human breath during inspiration and exhalation are measured quantitatively and successfully.

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