Quasi-Optical Blackbody Radiation Sources, Attenuators and Loads

Samples of quasi-optical blackbody radiation sources in the form of a thin resistive film on a dielectric substrate have been developed, manufactured and studied. The emissivity factor of the samples was measured at normal incidence on the quasi-optical tract. The samples give a fairly uniform absorption and radiation, but the emissivity factor is small compared to the same indicator for industrial absorbers in the form of complex three-dimensional structures. However, the use of an integrating cavity makes it possible to almost double the emissivity of the resistive film.