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

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

Institute of Experimental Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin, Germany
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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)
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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. View Full-Text
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
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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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