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Optical gas sensors using correlation spectroscopy. Report for Shell Research

Optical gas sensors using correlation spectroscopy. Report for Shell Research
Optical gas sensors using correlation spectroscopy. Report for Shell Research
This report reviews the feasibility of detection of impurities, in particular water vapour, in natural gas, using real-time correlation spectroscopy. The general concept relies on using a gas sample, contained in a reference cell, as a matched optical filter, to preferentially detect similar absorption spectra of the same gas in the measurement cell. All variations of the method have the advantage of excellent selectivity, provided the gases to be detected have narrow line spectra, even when using broadband sources for illumination. They are also suitable for direct-path measurements or for remote detection over optical fibre leads.

The report focuses on two main areas. Firstly, the Stark modulation method has been used to detect water and ammonia vapour. Secondly, we present an alternative correlation spectroscopic arrangement, in which the route of the light path is modulated. This new arrangement has been tested with both water vapour and ammonia. We give a comparison of the characteristics of both methods and discuss their suitability for determining water vapour contamination in natural gas.

Our conclusions are that the switched-path method has some potential of being developed to meet the Shell application for trace measurement of water vapour in high-pressure natural gas.
University of Southampton
Weigl, B.H.
ea511af1-ff39-494e-8424-28ef74bff5c9
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904
Weigl, B.H.
ea511af1-ff39-494e-8424-28ef74bff5c9
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904

Weigl, B.H. and Dakin, J.P. (1994) Optical gas sensors using correlation spectroscopy. Report for Shell Research (Optoelectronics Research Centre Papers) Southampton, GB. University of Southampton 19pp.

Record type: Monograph (Project Report)

Abstract

This report reviews the feasibility of detection of impurities, in particular water vapour, in natural gas, using real-time correlation spectroscopy. The general concept relies on using a gas sample, contained in a reference cell, as a matched optical filter, to preferentially detect similar absorption spectra of the same gas in the measurement cell. All variations of the method have the advantage of excellent selectivity, provided the gases to be detected have narrow line spectra, even when using broadband sources for illumination. They are also suitable for direct-path measurements or for remote detection over optical fibre leads.

The report focuses on two main areas. Firstly, the Stark modulation method has been used to detect water and ammonia vapour. Secondly, we present an alternative correlation spectroscopic arrangement, in which the route of the light path is modulated. This new arrangement has been tested with both water vapour and ammonia. We give a comparison of the characteristics of both methods and discuss their suitability for determining water vapour contamination in natural gas.

Our conclusions are that the switched-path method has some potential of being developed to meet the Shell application for trace measurement of water vapour in high-pressure natural gas.

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Published date: 1994
Additional Information: Report for Shell Research
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 393689
URI: https://eprints.soton.ac.uk/id/eprint/393689
PURE UUID: 0d033577-f80c-4a30-8be4-97e515695095

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Date deposited: 29 Apr 2016 15:40
Last modified: 17 Jul 2017 19:06

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Contributors

Author: B.H. Weigl
Author: J.P. Dakin

University divisions

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