A number of infrared radiometers have been developed at the Santa Barbara Research Center for the determination of planetary thermal balance and surface thermal properties. These instruments have performed well on Mariners 6 and 7 (Mars fly-by), Mariner 9 (Mars Orbiter), Mariner 10 (Venus fly-by and Mercury Orbiter), Pioneers 10 and 11 (Jupiter fly-by), and most recently Viking Orbiter. All use thin-film antimony-bismuth thermopiles developed at SBRC. Details of design, construction, performance, and sig-nificance of the data are discussed.
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