|Publication No: 1010||Search all ORC publications|
Latest developments in gas sensing using correlation spectroscopy
J.P.Dakin, H.O.Edwards* and B.H.Weigl**
Optoelectronics Research Centre, University of Southampton, U.K.
* Now at North West Water Ltd, Warrington WA5 3LW, U.K.
** Now at Department of Bioengineering, FJ-16, University of Washington, Seattle, WA 98195, USA
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.
Optics for Environmental and Public Safety: Conf Track on Chemical Biochemical and Environmental Fibre Sensors Munich 19-23 Jun (1995)
Copyright University of Southampton 2006