Abstract

Kalman adaptive filtering was applied for the first time, to our knowledge, to the real-time simultaneous determination of water isotopic ratios using laser absorption spectroscopy at 2.73μm. Measurements of the oxygen and hydrogen isotopologue ratios δO18, δO17, and δH2 in water showed a 1σ precision of 0.72‰ for δO18, 0.48‰ for δO17, and 0.84‰ for δH2, 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.

© 2010 Optical Society of America

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