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Sensors 2014, 14(5), 9027-9045; doi:10.3390/s140509027

Measurement of the D/H, 18O/16O, and 17O/16O Isotope Ratios in Water by Laser Absorption Spectroscopy at 2.73 μm

Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
Laboratoire de Physicochimie de l'Atmosphère, Université du Littoral Côte d'Opale, 189A, Av. Maurice Schumann, 59140 Dunkerque, France
Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
Nanoplus Nanosystems and Technologies GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany
Author to whom correspondence should be addressed.
Received: 1 March 2014 / Revised: 12 May 2014 / Accepted: 15 May 2014 / Published: 21 May 2014
(This article belongs to the Section Physical Sensors)
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A compact isotope ratio laser spectrometry (IRLS) instrument was developed for simultaneous measurements of the D/H, 18O/16O and 17O/16O isotope ratios in water by laser absorption spectroscopy at 2.73 μm. Special attention is paid to the spectral data processing and implementation of a Kalman adaptive filtering to improve the measurement precision. Reduction of up to 3-fold in standard deviation in isotope ratio determination was obtained by the use of a Fourier filtering to remove undulation structure from spectrum baseline. Application of Kalman filtering enables isotope ratio measurement at 1 s time intervals with a precision (<1‰) better than that obtained by conventional 30 s averaging, while maintaining a fast system response. The implementation of the filter is described in detail and its effects on the accuracy and the precision of the isotope ratio measurements are investigated. View Full-Text
Keywords: isotope ratios; water; Kalman filtering; laser absorption spectroscopy isotope ratios; water; Kalman filtering; laser absorption spectroscopy

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Wu, T.; Chen, W.; Fertein, E.; Masselin, P.; Gao, X.; Zhang, W.; Wang, Y.; Koeth, J.; Brückner, D.; He, X. Measurement of the D/H, 18O/16O, and 17O/16O Isotope Ratios in Water by Laser Absorption Spectroscopy at 2.73 μm. Sensors 2014, 14, 9027-9045.

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