Trace gas detection via cavity ring down spectroscopy

Richard A.H. Engeln; Rienk T. Jongma; Maarten G.H. Boogaarts; Iwan Holleman; Gerard C. M. Meijer

doi:10.1117/12.221077

20 September 1995 Trace gas detection via cavity ring down spectroscopy

Richard A.H. Engeln, Rienk T. Jongma, Maarten G.H. Boogaarts, Iwan Holleman, Gerard C. M. Meijer

Proceedings Volume 2506, Air Pollution and Visibility Measurements; (1995) https://doi.org/10.1117/12.221077
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

We report on the use of laser based cavity ring down spectroscopy in the near UV. It is this part of the spectrum that is particulary well-suited for trace gas detection, as many molecules have strong, well characterized absorption bands in this region. We show that the detection limit for e.g. NH₃ is in the order of 10 ppb, for OH below 1 ppb and for Hg at the ppt level. We propose a Fourier transform based cavity ring down spectrometer, in which the advantages of cavity ring down detection are combined with the multiplex advantage of a Fourier transform spectrometer. A theoretical description of this spectrometer, as well as a proposal for the construction of a prototype are worked out.

Citation Download Citation

Richard A.H. Engeln, Rienk T. Jongma, Maarten G.H. Boogaarts, Iwan Holleman, and Gerard C. M. Meijer "Trace gas detection via cavity ring down spectroscopy", Proc. SPIE 2506, Air Pollution and Visibility Measurements, (20 September 1995); https://doi.org/10.1117/12.221077

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