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Optical feedback cavity-enhanced absorption spectroscopy for in situ measurements of the ratio 13C:12C in CO2

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Abstract

We report on the design and laboratory performance of a portable infrared absorption spectrometer for the measurement of the isotopic ratio 13C:12C in CO2. The design relies on optical feedback cavity-enhanced absorption spectroscopy in the 2 μm spectral region to achieve optimal performance at ambient CO2 concentrations. The prototype instrument measures δ13C, relative to a standard calibration bottle, with a precision of ±0.7‰ for a 20-s integration time and with an automatic recalibration every 6 min. The absolute accuracy obtained is 0.9‰. The principal performance limitations are discussed along with improvements currently being implemented for the second generation instrument.

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Authors and Affiliations

  1. Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Via Vivaldi 43, Caserta, 81100, Italy

    R. Wehr & L. Gianfrani

  2. Laboratoire de Spectrométrie Physique – CNRS UMR5588, Université J. Fourier de Grenoble, 140 Rue de la Physique, Batiment E45, 38402, St. Martin d’Hères, France

    S. Kassi & D. Romanini

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  1. R. Wehr
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  2. S. Kassi
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  3. D. Romanini
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  4. L. Gianfrani
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Correspondence to R. Wehr.

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PACS

42.62.Fi; 07.57.Ty; 33.20.Ea

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Wehr, R., Kassi, S., Romanini, D. et al. Optical feedback cavity-enhanced absorption spectroscopy for in situ measurements of the ratio 13C:12C in CO2 . Appl. Phys. B 92, 459–465 (2008). https://doi.org/10.1007/s00340-008-3086-3

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  • DOI: https://doi.org/10.1007/s00340-008-3086-3

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