Optical scheme for the standard spectrophotometric suite (GÉT 156-91): 1) radiation source; 2) condenser lens; 3) monochromator; 4) mirror collimator; 5) sphere with diffusely reflecting coating and means of fastening specimen and radiation detector; 6) unit containing interchangeable filters; 7) chopper; 8) output condenser lens; 9, 19) plane mirrors; 10) set of aperture stops; 11) specimen displacement device; 12) integrating sphere to eliminate nonuniformity in the zonal sensitivity of the radiation detector 13; 14) measurement mirror; 15) photocell; 16) rotating device; 17) polarizer; 18) stop.

Context in source publication

Context 1

... reduced coeffi- cients for directional transmission τ(λ) = 0.001-0.100 and 0.01-0.99 in the wavelength 0.2-50.0 µm, for diffuse reflec- tion ρ(λ) d = 0.02-1.00 and specular reflection ρ(λ) s = 0.01-0.05 and 0.05-0.95 in the wavelength range 0.2-20.0 µm, and the scheme lays down the procedure for transmitting these units from the SPS GÉT 156-91 ( Fig. 3) to secondary standards by direct comparison, and also by direct and indirect measurement, and to working means of measurement by direct ...