Portal de Periódicos da CAPES

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

2006; SAGE Publishing; Volume: 60; Issue: 8 Linguagem: Inglês

10.1366/000370206778062075

1943-3530

R. Vasudev,

Spectroscopy and Quantum Chemical Studies

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 (H 2 16 O, H 2 18 O, 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.