Sensitive and selective monitoring of trace gases by laser photoacoustic spectroscopy

Markus W. Sigrist; Andreas M. Bohren; Irio G. Calasso; Markus Naegele; Albert Romann

doi:10.1117/12.386332

19 May 2000 Sensitive and selective monitoring of trace gases by laser photoacoustic spectroscopy

Markus W. Sigrist, Andreas M. Bohren, Irio G. Calasso, Markus Naegele, Albert Romann

Proceedings Volume 3916, Biomedical Optoacoustics; (2000) https://doi.org/10.1117/12.386332
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

Abstract

Important features of laser photoacoustic (PA) spectrometers employed in trace gas monitoring and multicomponent gas analysis are discussed. Narrowband laser sources with wide tunability in the mid-IR range are employed. We have developed and applied different laser-based PA spectrometers. These arrangements are briefly presented and the excellent detection performance in terms of sensitivity and specificity is illustrated by various examples. A high- pressure CO₂ laser, an optical parametric oscillator (OPO)-based difference frequency generation system and aline-tunable CO₂ laser, implemented in a trailer for in situ measurements, are employed as laser source. Novel PA cells and microphone arrays with up to 80 individual microphones have been developed. A detection limit of 10^-9 cm^-1 atm^-1 and a large dynamic range of seven orders of magnitude have been achieved with an extracavity multipass resonant PA cell. Examples to be presented include in situ multicomponent measurements on dynamically controlled atmospheres in fruit storage chambers or analyses of benzene-toluene-p-xylene mixtures.

Citation Download Citation

Markus W. Sigrist, Andreas M. Bohren, Irio G. Calasso, Markus Naegele, and Albert Romann "Sensitive and selective monitoring of trace gases by laser photoacoustic spectroscopy", Proc. SPIE 3916, Biomedical Optoacoustics, (19 May 2000); https://doi.org/10.1117/12.386332

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