Abstract
A two-channel radiometer has been developed to measure the equivalent blackbody surface temperatures of the equatorial and colder south polar regions of Mars. Two spectral channels, 8–12 μ and 18–25 μ, cover the temperature range of 140 K to 325 K. Evaporated thin film thermopile detectors of unusual design provide temperature resolution capability of better than 0.5°C for a surface temperature of 140 K. A simple low power stepping mirror in conjunction with a dc restore-memory circuit eliminates the need for a chopper, but at the same time provides a zero radiation reference and an inflight calibration point. The complete radiometer weighs 3.75 kg and consumes 3 W of power.
© 1969 Optical Society of America
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