Latest developments in gas sensing using correlation spectroscopy

Dakin, J.P., Edwards, Henry O. and Weigl, Bernhard H. (1995) Latest developments in gas sensing using correlation spectroscopy. In, Scheggi, Annamaria (eds.) Proceedings of Chemical, Biochemical, and Environmental Fiber Sensors VII. Optics for Environmental and Public Safety: Conf Track on Chemical Biochemical and Environmental Fibre Sensors Bellingham, US, The International Society for Optical Engineering, 2-17. (Proceedings of SPIE, 2508). (doi:10.1117/12.221720).


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The paper reviews latest developments in gas detection using real-time correlation spectroscopy. The general method relies on using a gas sample in a reference cell as a matched optical filter, to preferentially detect similar absorption spectra of the same gas in a measurement cell. All variations of the method have the advantage of excellent selectivity, provided the gases have narrow line spectra, even when using broadband sources for illumination. They are also suitable for remote detection over optical fibre leads. The paper describes work in three main areas. Firstly, work on a Stark modulation method to investigate a novel hygrometer is reviewed. Secondly, a multi-line light source, formed by combining a broadband optical source with a Michelson interferometer, which contains a gas in one arm, is described. Thirdly, the most recent progress with a complimentary-beam correlation spectroscopy detection systems using either alternately-chopped or intensity modulated light sources, is described. The latter methods are very simple as they allow use of a fixed reference gas cell

Item Type: Book Section
Digital Object Identifier (DOI): doi:10.1117/12.221720
ISBNs: 9780819418661
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions : University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 77021
Accepted Date and Publication Date:
29 September 1995Delivered
Date Deposited: 11 Mar 2010
Last Modified: 31 Mar 2016 13:11

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