Authors: Duffin, Kevin; Johnstone, Walter; McGettrick, Andrew; Moodie, Dave; Stewart, George; Thursby, Graham; Culshaw, Brian

Source: Current Analytical Chemistry, Volume 4, Number 4, October 2008 , pp. 391-402(12)

Publisher: Bentham Science Publishers

Abstract:

This paper reviews the principles and prospects for optical fibre based measurement techniques for determining gas concentrations. Most of these exploit the precision and versatility of tuneable diode laser spectroscopy in the near infrared. We demonstrate the potential offered by large area multipoint totally passive networks and establish the performance potential which these may offer in hostile environments. These benefits include more than adequate sensitivity for most applications, automatic recalibration of both zero point and scale factor and the ability to precisely determine line shape information and in some cases perform detailed line spectrum analysis to determine concentration, pressure and temperature simultaneously. We also briefly describe the principles and application of photo acoustic spectroscopy and outline the performance improvements which tuneable diode laser systems also offer in this context. These studies have illustrated that, in appropriate niche applications, fibre based gas measurement systems offer substantial long term engineering potential.

Keywords: Chemical Sensor Networks; Gas Detection; Environmental Monitoring; diode laser; spectroscopy; Infrared Spectra

Document Type: Research article

DOI: http://dx.doi.org/10.2174/157341108785914853

Publication date: 2008-10-01

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• Current Analytical Chemistry publishes authoritative reviews, written by experts in the field on all the most recent advances in analytical chemistry. All aspects of the field are represented including analytical methodology, techniques and instrumentation in both fundamental and applied areas of the field. The journal is essential to all involved in analytical chemistry and applied areas.

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