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Evolution of highly-selective gas sensing methods using correlation spectroscopy

Evolution of highly-selective gas sensing methods using correlation spectroscopy
Evolution of highly-selective gas sensing methods using correlation spectroscopy
This review describes the recent history and latest developments in gas detection at Southampton University, using real-time correlation spectroscopy. The general approach has been to use a gas sample as a matched optical filter, to selectively detect similar absorption spectra of the same gas in a measurement region. All variations of the method exhibit excellent selectivity whenever the gases have narrow line spectra, even when simple broadband sources are used for illumination. Several have been employed in laboratory tests, for remote detection over optical fibre leads. The paper describes work in four main areas. Firstly, our earliest work on a pressure modulation for methane detection is briefly reviewed, secondly a Stark modulation method to form an optical hygrometer is described, thirdly a multi-line light source (formed by combining a broadband optical source with a Michelson interferometer, having a gas cell in one arm) is discussed and, finally the most recent
progress with a complementary modulated beam system, using either alternately-chopped or intensity modulated light sources, is described.
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904

Dakin, J.P. (2002) Evolution of highly-selective gas sensing methods using correlation spectroscopy. ASCOS 2002 Summer School. 25 - 30 Sep 2002.

Record type: Conference or Workshop Item (Other)

Abstract

This review describes the recent history and latest developments in gas detection at Southampton University, using real-time correlation spectroscopy. The general approach has been to use a gas sample as a matched optical filter, to selectively detect similar absorption spectra of the same gas in a measurement region. All variations of the method exhibit excellent selectivity whenever the gases have narrow line spectra, even when simple broadband sources are used for illumination. Several have been employed in laboratory tests, for remote detection over optical fibre leads. The paper describes work in four main areas. Firstly, our earliest work on a pressure modulation for methane detection is briefly reviewed, secondly a Stark modulation method to form an optical hygrometer is described, thirdly a multi-line light source (formed by combining a broadband optical source with a Michelson interferometer, having a gas cell in one arm) is discussed and, finally the most recent
progress with a complementary modulated beam system, using either alternately-chopped or intensity modulated light sources, is described.

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Published date: 2002
Venue - Dates: ASCOS 2002 Summer School, 2002-09-25 - 2002-09-30

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Local EPrints ID: 17018
URI: https://eprints.soton.ac.uk/id/eprint/17018
PURE UUID: 1cbd23d7-b4ba-46ac-8a34-df8eb375b92d

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Date deposited: 09 Sep 2005
Last modified: 12 Sep 2019 16:31

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Author: J.P. Dakin

University divisions

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