An instrument and method of measuring monochromatic hemispherical reflectances of opaque materials are described. In this method a cool sample is exposed is exposed to blackbody radiation from a high temperature source and the monochromatic radiation ...
An instrument and method of measuring monochromatic hemispherical reflectances of opaque materials are described. In this method a cool sample is exposed is exposed to blackbody radiation from a high temperature source and the monochromatic radiation reflected from the surface is compared to the blackbody radiation from the cavity at that wavelength. The data are thus hemispherical angular monochromatic reflectances. The reflectances of copper black, nickel black and several other black paints are measured by this method.