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 (ed.) 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|
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
|Date Deposited:||11 Mar 2010|
|Last Modified:||02 Mar 2012 13:45|
|Publisher:||The International Society for Optical Engineering|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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