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A Hollow-Waveguide Gas Correlation Radiometer for Ultra-Precise Column Measurements of Formaldehyde on MarsWe present preliminary results in the development of a miniaturized gas correlation radiometer that implements a hollow-core optical fiber (hollow waveguide) gas correlation cell. The substantial reduction in mass and volume of the gas correlation cell makes this technology appropriate for an orbital mission -- capable of pinpointing sources of trace gases in the Martian atmosphere. Here we demonstrate a formaldehyde (H2CO) sensor and report a detection limit equivalent to approximately 30 ppb in the Martian atmosphere. The relative simplicity of the technique allows it to be expanded to measure a range of atmospheric trace gases of interest on Mars such as methane (CH4), water vapour (H2O), deuterated water vapour (HDO), and methanol (CH3OH). Performance of a formaldehyde instrument in a Mars orbit has been simulated assuming a 3 meter long, 1000 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 ppb is possible.
Document ID
20110008107
Document Type
Preprint (Draft being sent to journal)
Authors
Wilson, Emily L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Neveu, Marc (Institut Superieur de L'Aeronautique et de L'Espace Toulouse, France)
Riris, Haris (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Georgieva, Elena M. (Maryland Univ. Baltimore, MD, United States)
Heaps, William S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Instrumentation and Photography
Distribution Limits
Public
Copyright
Public Use Permitted.

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