emittance (e)


ratio of the radiant intensity of the specimen to that emitted by a black body radiator at the same temperature and under the same geometric and wavelength conditions


  • NOTE Differentiation is made between: - Hemispherical emittance (eh) - conditions for incidence or viewing of flux over a hemispherical region. - Normal emittance (en) - conditions for incidence or viewing through a solid angle normal to the specimen. Ratio refers to the emissivity normal to the surface of the emitting body.
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