Characteristics of the Optical System of the Solntse–Terahertz Scientific Equipment

The article presents a brief description of the main scientific objectives of the Solntse–Terahertz project. As part of this project, the Lebedev Physical Institute is manufacturing scientific equipment for installation on the Russian segment of the International Space Station. The optical system of each of the eight scientific equipment’s radiation receivers consists of a system of mirrors, an optical chopper, low-pass and bandpass filters. Spectral characteristics were obtained for each element of this system. When calibrating the device, a source—a black-body simulator (BBS)—is used, and, therefore, using numerical integration methods, the intensity of radiation from the BBS that passes through the filter system was calculated. To estimate the characteristic signal from the quiet Sun, the radiation intensity passing through the filter system was calculated using numerical integration methods using the standard ASTM E-490 solar spectrum.