Optical feedback cavity-enhanced absorption spectroscopy for in situ measurements of the ratio 13C:12C in CO2 |
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| Authors: | R. Wehr S. Kassi D. Romanini L. Gianfrani |
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| Affiliation: | (1) Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Via Vivaldi 43, Caserta, 81100, Italy;(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 |
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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. PACS 42.62.Fi; 07.57.Ty; 33.20.Ea |
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