Biology
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p21a0225w&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P21A-0225
Biology
5200 Planetary Sciences: Astrobiology, 5400 Planetary Sciences: Solid Surface Planets, 5700 Planetary Sciences: Fluid Planets, 6000 Planetary Sciences: Comets And Small Bodies, 6200 Planetary Sciences: Solar System Objects
Scientific paper
Development of a passive hollow-core fiber gas correlation radiometer instrument is presented for column absorption measurements of methane, formaldehyde and water vapor in the Martian atmosphere. This nadir viewing instrument consists of three sub-instruments for detecting CH4, H2CO, and H2O at 3.44 microns, 3.63 microns, and 3.12 microns respectively. At the core of each sub-instrument is a hollow-core optical fiber filled with a sample of the gas of interest which acts as a spectral filter. Gas correlation radiometers are a robust, reliable, highly developed technology. Adapting the newly available hollow-core optical fibers into this technology offers a substantial reduction in instrument mass and volume. This lightweight and compact instrument is highly suitable for deployment on a Mars orbiting mission. Performance of a Mars orbiting version of the hollow-core fiber instrument has been simulated assuming a 2 meter long, 500 micron inner diameter hollow-core fiber gas correlation cell, a 92.8 degree sun-synchronous orbit from 400 km with a horizontal sampling scale of 10 x 10 km2. Initial results indicate that for one second of averaging, a detection limit of 1 ppbv is possible for formaldehyde, with slightly better than 1 ppbv for methane. Because of its comprehensive measurement of both methane, formaldehyde, and water vapor at relevant detection limits and spatial scales, this instrument has the potential for localizing sources of these disequilibrium species on the Martian surface to aid in determining whether their origin is biogenic or geologic.
Georgieva E. M.
Heaps William S.
Wilson Leroy E.
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