Hodges, J.
and Lisak, D.
(2006),
Frequency-Stabilized Cavity Ring-Down Spectrometer for High-Sensitivity Measurements of Water Vapor Concentration, Applied Physics B
(Accessed April 23, 2025)
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Frequency-Stabilized Cavity Ring-Down Spectrometer for High-Sensitivity Measurements of Water Vapor Concentration
Published
Author(s)
,
Abstract
We present a portable spectrometer that uses the frequency-stabilized cavity ring-down spectroscopy technique to realize high-precision measurements of trace water vapor concentration. Measuring one of the strongest rovibrational transitions in the 1 + 3 water vapor combination band near ~ =7181:156 cm 1, we compare spectroscopic and thermodynamic determinations of tracewater vapor in N2, and nd systematic di erences attributable to water vapor background e ects and/or uncertainties in line intensities. We also compare the frequency-stabilized ring-down method with other cavity ring-down approaches that are based on unstabilized probe lasers and unstabilized ring-down cavities. We show that for the determination of water vapor concentration, thefrequency-stabilized cavity ring-down method has the minimum measurement uncertainty of these three techniques. The minimum noise-equivalent absorption coefficient of the spectrometer was 1:2 10 10 cm 1 Hz 1=2.Citation
Applied Physics B
Volume
85
Pub Type
Journals
Keywords
cavity ring down, hygrometer, laser spectroscopy, water vapor
Citation
Issues
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Created January 1, 2006, Updated February 19, 2017