Hollow-Core Optical Fiber Gas Correlation Radiometer for CH4, H2CO, and H2O vapor measurements on Mars

Details Hollow-Core Optical Fiber Gas Correlation Radiometer for CH4, H2CO, and H2O vapor measurements on Mars Hollow-Core Optical Fiber Gas Correlation Radiometer for CH4, H2CO, and H2O vapor measurements on Mars

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p53c1465h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P53C-1465

Computer Science

Performance

0300 Atmospheric Composition And Structure, 0343 Planetary Atmospheres (5210, 5405, 5704), 0394 Instruments And Techniques

Scientific paper

We present the development of a reduced mass and volume gas correlation radiometer that implements a hollow-core fiber gas correlation cell. The reduction in size makes this technology appropriate for a Mars orbital or aircraft probe mission - capable of pin-pointing sources of atmospheric trace gases potentially indicative of life (methane, formaldehyde and water). The relative simplicity of this technique allows it to be easily expanded to include other species measurements such as 12C/13C ratios of methane. This instrument will consist of three sub-instruments for detecting CH4, H2CO, and H2O at 3.44 μm, 3.63 μm, and 3.12 μm respectively. Within each sub-instrument, a hollow-core optical fiber filled with a sample of the gas of interest acts as a spectral filter. 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 km x 10 km. 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. Preliminary results are presented for the formaldehyde sub-instrument development.

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