Abstract
The infrared spectrometer that recorded spectra of the atmosphere and surface of Mars during the Mariner 6 and 7 flyby missions is described. The instrument continuously scanned the 1.9-μ to 14.4-μ spectral region at 10 sec per scan. Approximately 1 % spectral resolution was furnished by two rotating, circular, variable interference filters. The spectral region 1.9–6.0 μ was recorded with a PbSe detector cooled to 175 K by radiation to deep space. The spectral region 3.9–14.4 μ was modulated by a cold (175 K) tuning fork chopper and recorded with a mercury-doped germanium detector cooled to 22 K by a Joule-Thomson two-stage (N2 and H2) cryostat. The total weight of the instrument was 17.4 kg (monochromator plus electronics, 11.5 kg; gas delivery system, 5.9 kg), and it consumed 11 W of power.
© 1972 Optical Society of America
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