Physics – Optics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000came.work...67c&link_type=abstract
Concepts and Approaches for Mars Exploration, p. 67
Physics
Optics
Spectrometers, Thermal Emission, Mars Missions, Michelson Interferometers, Soil Mapping, Mars Surface, Infrared Imagery, Cassegrain Optics, Infrared Detectors
Scientific paper
The Miniature Thermal Emission Spectrometer (Mini-TES) is a mature, high-performance infrared remote sensing instrument designed specifically for use on the martian surface. The major objectives of the Mini-TES portion of the Athena investigation are: (1) to map the mineralogy of rocks and soils from the near field to the horizon; (2) to determine the temperature profile and dust, water vapor and water ice abundance of the lower atmosphere; and (3) to determine the thermophysical properties (particle size, induration, and sub-surface layering) of the surrounding terrain. The instrument uses optical, electronic, and mechanical designs with high heritage from the Mars Global Surveyor TES instrument currently in orbit around Mars. The Mini-TES will provide infrared spectral image cubes of the full 360 deg scene around the rover from 50 deg below to 30 deg above the horizon at spatial resolutions of 8 and 20 mrad (8 and 20 cm at 10 m distance). Mini-TES covers the spectral range from 5 to 30 microns (2000 to 333/cm) with a spectral resolution of 10/cm . An elevation mirror capable of rotating more than 180 deg is mounted atop the mast between the two Pan-cam camera heads, reflecting radiation down through the mast and the azimuthal drive system, and into the Mini-TES telescope and interferometer. This system provides a full panoramic view of the surface, the atmosphere, and an internal, full-aperture calibration target. The spectrometer telescope is a 6.35-cm diameter reflecting Cassegrain that feeds a flat-plate Michelson interferometer. The instrument uses an uncooled deuterated triglycine sulfate (DTGS) pyroelectric detector that can operate from -40 to +40 C with no required cooling or heating.
Christensen Per Rex
Gorelick Noel
Mehall Greg L.
Silverman Sam
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