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Article Dans Une Revue Optics Letters Année : 2010

Kalman Filtering Real-Time Measurements of H2O Isotopologue Ratios by Laser Absorption Spectroscopy at 2.73 μm

Résumé

Kalman adaptive filtering was applied for the first time to the real-time simultaneous determination of water isotopic ratios using laser absorption spectroscopy at 2.73 μm. Measurements of the oxygen and hydrogen isotopologue ratios δ18O, δ17O, and δ2H in water showed a 1-σ precision of 0.72‰ for δ18O, 0.48‰ for δ17O, and 0.84‰ for δ2H, while sampling the output of the tuned Kalman filter at 1-s time intervals. Using a standard running average technique, averaging over ~30-s is required to obtain the same level of precision. The Kalman filter has the advantage of a faster response to step-like changes in the input than the 30-s averaged output and is significantly less susceptible to outlier values (‘spikes'). This is an important advantage for applications in which small but fast changes in the isotopic composition need to be resolved, such as, for example, in on-line breath analysis.
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Dates et versions

hal-00563766 , version 1 (07-02-2011)

Identifiants

  • HAL Id : hal-00563766 , version 1

Citer

Tao Wu, Weidong Chen, E. R. T. Kerstel, E. Fertein, Xiaoming Gao, et al.. Kalman Filtering Real-Time Measurements of H2O Isotopologue Ratios by Laser Absorption Spectroscopy at 2.73 μm. Optics Letters, 2010, 35, pp.634. ⟨hal-00563766⟩
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