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20 January 2012 Spectroscopic measurements of isotopic water composition using a new modulation cancellation method
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Abstract
We report on the application of an innovative spectroscopic balancing technique to measure isotopologue abundance quantification. We employ quartz enhanced photoacoustic spectroscopy in a 2f wavelength modulation mode as an absorption sensing technique and water vapor as a test analyte. Isotope absorption lines with very close lower energy levels and with the same quantum numbers have been selected to limit the sensitivity to temperature variations and guarantee identical broadening relaxation properties. A detection sensitivity in measuring the deviation from a standard sample δ18O of 1.4%o, in 200 sec of integration time was achieved.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vincenzo Spagnolo, Lei Dong, Anatoliy A. Kosterev, and Frank K. Tittel "Spectroscopic measurements of isotopic water composition using a new modulation cancellation method", Proc. SPIE 8268, Quantum Sensing and Nanophotonic Devices IX, 82682E (20 January 2012); https://doi.org/10.1117/12.912499
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