Pioneer 10 has successfully encountered Jupiter and several of its satellites. The two-channel infrared radiometer used to obtain data relating to thermal properties of the planet and its atmosphere is described. The instrument features a body-fixed, 7.62-cm diam aperture Cassegrainian telescope with reststrahlen filters defining the 14-µm to 25-µm and 30-µm to 56-µm bands. Detectors are 88-junction evaporated thin-film thermopiles. Stringent weight constraints of 2 kg dictated all-beryllium construction. Power Consumption was 1.2 W.
M. L. Bender, P. W. Callaway, S. C. Chase, G. F. Moore, and R. D. Ruiz, "Infrared Radiometer for the Pioneer 10 and 11 Missions to Jupiter," Appl. Opt. 13, 2623-2628 (1974)