INFRARED SPECTRAL EMISSIVITY OF OPTICAL MATERIALS

摘要

The spectral emissivity of several optical materials was measured in the 2- to 15-micron region of the infrared spectrum, at temperatures of 40 to 180℃. The emission from each sample was compared with that from a black body, by means of a modified Beckman IR-3 spectro¬photometer. Spectral emissivity curves are presented for germanium, silicon, cadmium sulfide, KRS-5, glass, and quartz. From these data, the absorption coefficient was calculated for germanium and for cadmi¬um sulfide. The results indicate that this method is an excellent one' for measuring low values of the absorption coefficient.