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

Content Provider	MDPI
Author	Wu, Tao Chen, Weidong Fertein, Eric Masselin, Pascal Gao, Xiaoming Zhang, Weijun Wang, Yingjian Koeth, Johannes Brückner, Daniela He, Xingdao
Abstract	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.
File Size	904192
Ending Page	9045
Page Count	19
Starting Page	9027
File Format	PDF
e-ISSN	14248220
DOI	10.3390/s140509027
Journal	Sensors
Issue Number	5
Volume Number	14
Language	English
Publisher Date	2014-05-21
Access Restriction	Open
Subject Keyword	isotope ratios water Kalman filtering laser absorption spectroscopy
Content Type	Text
Resource Type	Article

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