Measurement of the D/H, 18O/16O, and 17O/16O isotope ratios in water by laser absorption spectroscopy at 2.73 μm

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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. © 2014 by the authors; licensee MDPI, Basel, Switzerland.

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Wu, T., Chen, W., Fertein, E., Masselin, P., Gao, X., Zhang, W., … He, X. (2014). Measurement of the D/H, 18O/16O, and 17O/16O isotope ratios in water by laser absorption spectroscopy at 2.73 μm. Sensors (Switzerland), 14(5), 9027–9045. https://doi.org/10.3390/s140509027

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