Sensors | |
Measurement of the D/H, 18O/16O, and 17O/16O Isotope Ratios in Water by Laser Absorption Spectroscopy at 2.73 μm | |
Tao Wu4  Weidong Chen1  Eric Fertein1  Pascal Masselin1  Xiaoming Gao3  Weijun Zhang3  Yingjian Wang3  Johannes Koeth2  Daniela Br࿌kner2  | |
[1] Laboratoire de Physicochimie de l'Atmosphère, Université du Littoral Côte d'Opale, 189A, Av. Maurice Schumann, 59140 Dunkerque, France; E-Mails:;Nanoplus Nanosystems and Technologies GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany; E-Mails:;Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; E-Mails:;Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China; E-Mails: | |
关键词: isotope ratios; water; Kalman filtering; laser absorption spectroscopy; | |
DOI : 10.3390/s140509027 | |
来源: mdpi | |
【 摘 要 】
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.
【 授权许可】
CC BY
© 2014 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
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