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Sensors 2011, 11(2), 1620-1640; doi:10.3390/s110201620
Review

PCF-Based Cavity Enhanced Spectroscopic Sensors for Simultaneous Multicomponent Trace Gas Analysis

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Received: 20 October 2010 / Revised: 16 November 2010 / Accepted: 4 January 2011 / Published: 27 January 2011
(This article belongs to the Special Issue 10 Years Sensors - A Decade of Publishing)
View Full-Text   |   Download PDF [414 KB, 21 June 2014; original version 21 June 2014]   |   Browse Figures

Abstract

A multiwavelength, multicomponent CRDS gas sensor operating on the basis of a compact photonic crystal fibre supercontinuum light source has been constructed. It features a simple design encompassing one radiation source, one cavity and one detection unit (a spectrograph with a fitted ICCD camera) that are common for all wavelengths. Multicomponent detection capability of the device is demonstrated by simultaneous measurements of the absorption spectra of molecular oxygen (spin-forbidden b-X branch) and water vapor (polyads 4v, 4v + d) in ambient atmospheric air. Issues related to multimodal cavity excitation, as well as to obtaining the best signal-to-noise ratio are discussed together with methods for their practical resolution based on operating the cavity in a “quasi continuum” mode and setting long camera gate widths, respectively. A comprehensive review of multiwavelength CRDS techniques is also given.
Keywords: molecular spectroscopy; cavity ring-down absorption spectroscopy; cavity-enhanced absorption spectroscopy; photonic crystal fibres; supercontinuum lasers molecular spectroscopy; cavity ring-down absorption spectroscopy; cavity-enhanced absorption spectroscopy; photonic crystal fibres; supercontinuum lasers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nakaema, W.M.; Hao, Z.-Q.; Rohwetter, P.; Wöste, L.; Stelmaszczyk, K. PCF-Based Cavity Enhanced Spectroscopic Sensors for Simultaneous Multicomponent Trace Gas Analysis. Sensors 2011, 11, 1620-1640.

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