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
Current Analytical Chemistry
Title: Chemical Sensor Networks for Gas Detection and Environmental Monitoring
Volume: 4 Issue: 4
Author(s): Kevin Duffin, Walter Johnstone, Andrew McGettrick, Dave Moodie, George Stewart, Graham Thursby and Brian Culshaw
Affiliation:
Keywords: Chemical Sensor Networks, Gas Detection, Environmental Monitoring, diode laser, spectroscopy, Infrared Spectra
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.
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Cite this article as:
Duffin Kevin, Johnstone Walter, McGettrick Andrew, Moodie Dave, Stewart George, Thursby Graham and Culshaw Brian, Chemical Sensor Networks for Gas Detection and Environmental Monitoring, Current Analytical Chemistry 2008; 4 (4) . https://dx.doi.org/10.2174/157341108785914853
DOI https://dx.doi.org/10.2174/157341108785914853 |
Print ISSN 1573-4110 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6727 |
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