Computer Science – Performance
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.2908r&link_type=abstract
American Astronomical Society, DPS meeting #31, #29.08
Computer Science
Performance
Scientific paper
The predicted importance of the hydroxyl radical, OH, in the chemistry of the atmospheres of Mars and Venus, icy satellites such as Europa, and comets illustrates the broad interest in making definitive OH measurements for a wide array of solar system objects. In particular, hydroxyl is central to the study of the Martian atmosphere, where it is thought to be the primary catalytic agent in the chemical cycles that allow long term stability of the CO_2 atmosphere. Observations of OH would thus provide an opportunity to test our understanding of the chemical evolution of the Martian atmosphere. Until now, a compact, highly-sensitive, and robust remote sensing instrument for space deployment capable of making the desired measurements has not been developed. We have recently completed the testing of laboratory and engineering models of a Spatial Heterodyne Spectrometer (SHS) suitable for making the desired measurements, and meeting the packaging requirements of small spacecraft. SHS is a field-widened Fourier-transform optical spectroscopic technique that requires no moving parts, has relaxed optical tolerances compared to conventional interference spectrometers, and, at a specified resolving power, achieves a throughput higher by four orders of magnitude than conventional grating instruments of similar size (Harlander et al., Ap. J., 396, 730, 1992). We will describe the basic operation of the SHS, illustrate the near-theoretical performance achieved with it in laboratory studies of the OH fluorescence band near 308 nm, and discuss plans for a monolithic, optically-contacted miniature SHS suitable, for example, for incorporating into a Mars or Europa mission. Supported in part by NSF grant ATM-9612228 to the University of Wisconsin.
Conway Robert R.
Harlander Jens
Roesler Fred L.
Summers Michael E.
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