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 . Measurements of the oxygen and hydrogen isotopologue ratios , , and in water showed a precision of 0.72‰ for , 0.48‰ for , and 0.84‰ for , while sampling the output of the tuned Kalman filter at 1 s time intervals. Using a standard running average technique, averaging over is required to obtain the same level of precision.
© 2010 Optical Society of America
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