Sensors | |
Measurement of the D/H, 18O/16O, and 17O/16O Isotope Ratios in Water by Laser Absorption Spectroscopy at 2.73 μm | |
Xiaoming Gao1  Weijun Zhang1  Yingjian Wang1  Xingdao He2  Tao Wu2  Eric Fertein3  Pascal Masselin3  Weidong Chen3  Johannes Koeth4  Daniela Brückner4  | |
[1] Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;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;Nanoplus Nanosystems and Technologies GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany; | |
关键词: isotope ratios; water; Kalman filtering; laser absorption spectroscopy; | |
DOI : 10.3390/s140509027 | |
来源: DOAJ |
【 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】
Unknown