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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 5 — Mar. 1, 2010
  • pp: 634–636

Kalman filtering real-time measurements of H 2 O isotopologue ratios by laser absorption spectroscopy at 2.73 μ m

Tao Wu, Weidong Chen, Erik Kerstel, Eric Fertein, Xiaoming Gao, Johannes Koeth, Karl Rößner, and Daniela Brückner  »View Author Affiliations

Optics Letters, Vol. 35, Issue 5, pp. 634-636 (2010)

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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 2.73 μ m . Measurements of the oxygen and hydrogen isotopologue ratios δ O 18 , δ O 17 , and δ H 2 in water showed a 1 σ precision of 0.72‰ for δ O 18 , 0.48‰ for δ O 17 , and 0.84‰ for δ H 2 , 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

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:

Original Manuscript: September 17, 2009
Revised Manuscript: January 4, 2010
Manuscript Accepted: January 12, 2010
Published: February 22, 2010

Tao Wu, Weidong Chen, Erik Kerstel, Eric Fertein, Xiaoming Gao, Johannes Koeth, Karl Rößner, and Daniela Brückner, "Kalman filtering real-time measurements of H2O isotopologue ratios by laser absorption spectroscopy at 2.73 μm," Opt. Lett. 35, 634-636 (2010)

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