UTILIZATION OF ABSOLUTE RADIOMETERS IN USSR NATIONAL STANDARDS OF IRRADIANCE UNITS

A high-precision absolute radiometer with a thermally stabilized cavity as the receiving element was designed in 1984 at the All-Union Research Institute for Optical and Physical Measurements (VNIIOFI) and used to derive the USSR National Special Standard of the solar irradiance unit. Since that time, the radiometer has been developed further. The absolute radiometer has taken part in the comparisons with the angstrom 212 pyrheliometer and other absolute radiometers and standards of COMECON countries. This work has made possible the development of a combined radiometric standard based on the absolute radiometer and black-body radiators.