Isotopic resolution of carbon monoxide and carbon dioxide by NIR diode laser spectroscopy

Steffen Lau; Katharina Salffner; Hans-Gerd Löhmannsröben

doi:10.1117/12.662765

25 April 2006 Isotopic resolution of carbon monoxide and carbon dioxide by NIR diode laser spectroscopy

Steffen Lau, Katharina Salffner, Hans-Gerd Löhmannsröben

Proceedings Volume 6189, Optical Sensing II; 618924 (2006) https://doi.org/10.1117/12.662765
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

Near-infrared (NIR) absorption spectroscopy with tunable diode lasers allows the simultaneous detection of the three most important isotopologues of carbon dioxide (¹²CO₂, ¹³CO₂, ¹²C¹⁸O¹⁶O) and carbon monoxide (¹²CO,¹³CO, ¹²C¹⁸O). The flexible and compact fiber-optic tunable diode laser absorption spectrometer (TDLAS) allows selective measurements of CO₂ and CO with high isotopic resolution without sample preparation since there is no interference with water vapour. For each species, linear calibration plots with a dynamic range of four orders of magnitude and detection limits (LOD) in the range of a few ppm were obtained utilizing wavelength modulation spectroscopy (WMS) with balanced detection in a Herriott-type multipass cell. The high performance of the apparatus is illustrated by fill-evacuation- refill cycles.

Citation Download Citation

Steffen Lau, Katharina Salffner, and Hans-Gerd Löhmannsröben "Isotopic resolution of carbon monoxide and carbon dioxide by NIR diode laser spectroscopy", Proc. SPIE 6189, Optical Sensing II, 618924 (25 April 2006); https://doi.org/10.1117/12.662765

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KEYWORDS

Carbon monoxide

Gas lasers

Spectroscopy

Semiconductor lasers

Laser spectroscopy

Near infrared

Absorption

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