A quantitative comparison of dispersion- and absorption-spectroscopic gas sensing

Jakob Hayden; Pedro Martín-Mateos; Pablo Acedo; Bernhard Lendl

doi:10.1117/12.2252624

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20 February 2017 A quantitative comparison of dispersion- and absorption-spectroscopic gas sensing

Jakob Hayden, Pedro Martín-Mateos, Pablo Acedo, Bernhard Lendl

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Proceedings Volume 10110, Photonic Instrumentation Engineering IV; 101100Z (2017) https://doi.org/10.1117/12.2252624
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

Dispersion spectroscopic sensing of trace gases, measuring the anomalous dispersion at a molecular resonance rather than absorption, has experienced increased attention in the past view years. Their advantages over absorption based spectroscopic sensing are the independence of signals from laser power and their linearity with concentration, even for optically thick samples. In this contribution, we give a comparative discussion of performance, noise and limitations of dispersion and absorption spectroscopy. We relate dispersion spectroscopy to phase-shift rangefinding, for which figures of merit are available in literature. Based on our analysis we conclude that dispersion spectroscopy cannot outperform absorption spectroscopy in most experimental situations. In some applications, where the optical power reaching the detector is unstable, dispersion spectroscopic techniques can, however, be advantageous.

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Jakob Hayden, Pedro Martín-Mateos, Pablo Acedo, and Bernhard Lendl "A quantitative comparison of dispersion- and absorption-spectroscopic gas sensing", Proc. SPIE 10110, Photonic Instrumentation Engineering IV, 101100Z (20 February 2017); https://doi.org/10.1117/12.2252624

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