Latest developments in gas sensing using correlation spectroscopy

John P. Dakin; Henry O. Edwards; Bernhard H. Weigl

doi:10.1117/12.221720

29 September 1995 Latest developments in gas sensing using correlation spectroscopy

John P. Dakin, Henry O. Edwards, Bernhard H. Weigl

Proceedings Volume 2508, Chemical, Biochemical, and Environmental Fiber Sensors VII; (1995) https://doi.org/10.1117/12.221720
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

This 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 fiber leads. This paper describes work in three main areas. First, work on a Stark modulation method to investigate a novel hygrometer is reviewed. Second, a multiline light source, formed by combining a broadband optical source with a Michelson interferoemeter, which contains a gas in one arm, is described. Third, the most recent progress with a complimentary-beam correlation spectroscopy detection system 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.

Citation Download Citation

John P. Dakin, Henry O. Edwards, and Bernhard H. Weigl "Latest developments in gas sensing using correlation spectroscopy", Proc. SPIE 2508, Chemical, Biochemical, and Environmental Fiber Sensors VII, (29 September 1995); https://doi.org/10.1117/12.221720

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