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 (H₂¹⁶O, H₂¹⁸O, 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 <i>in situ</i> planetary exploration.

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