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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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