Wavelength Modulated Cavity Enhanced Absorption Spectroscopy of Water in the 1.37 μm Region

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Abstract:

We describe the performance of a high-sensitivity wavelength modulated cavity enhanced infrared tunable diode laser absorption spectrometer for the detection of water vapor in the 1.37 μm region. The spectrometer can measure a fractional absorption of ∼10−5 for an absorption path length of a few kilometers. The instrument's sensitivity is more than sufficient to detect water isotopomers (H2 16O, H2 18O, HDO) at Martian atmospheric concentrations. The instrument is amenable to miniaturization, so a future compact, multiple-species version of the spectrometer will be highly suitable for in situ planetary exploration.

Keywords: DIODE LASER; ISOTOPOMERS; MARS; NEAR-INFRARED SPECTROSCOPY; PLANETARY; WATER

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206778062075

Affiliations: Jet Propulsion Laboratory, California Institute of Technology, MS 183–401, 4800 Oak Grove Drive, Pasadena, California 91109

Publication date: August 1, 2006

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