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Proceedings Paper

A quantitative comparison of dispersion- and absorption-spectroscopic gas sensing
Author(s): Jakob Hayden; Pedro Martín-Mateos; Pablo Acedo; Bernhard Lendl
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Paper 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.

Paper Details

Date Published: 20 February 2017
PDF: 7 pages
Proc. SPIE 10110, Photonic Instrumentation Engineering IV, 101100Z (20 February 2017); doi: 10.1117/12.2252624
Show Author Affiliations
Jakob Hayden, Technische Univ. Wien (Austria)
Pedro Martín-Mateos, Univ. Carlos III de Madrid (Spain)
Pablo Acedo, Univ. Carlos III de Madrid (Spain)
Bernhard Lendl, Technische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 10110:
Photonic Instrumentation Engineering IV
Yakov G. Soskind; Craig Olson, Editor(s)

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