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- Title
Optical feedback cavity-enhanced absorption spectroscopy for in situ measurements of the ratio <sup>13</sup>C:<sup>12</sup>C in CO<sub>2</sub>.
- Authors
Wehr, R.; Kassi, S.; Romanini, D.; Gianfrani, L.
- 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.
- Subjects
SPECTRUM analysis instruments; INFRARED spectroscopy; GAS detector calibration; SPECTROMETERS; DIAGNOSTIC use of spectrum analysis
- Publication
Applied Physics B: Lasers & Optics, 2008, Vol 92, Issue 3, p459
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-008-3086-3