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Proceedings Paper

Optical fibre sensors for the monitoring of harmful emissions from land transport vehicles
Author(s): Jim Mulrooney; John Clifford; Colin Fitzpatrick; Elfed Lewis; W. Z. Zhao; T. Sun; K. T. V. Grattan; M. Degner; H. Ewald; S. Lochmann; A. Al-Shamma'a; J. Lucas; E. Merlone Borla; P. Faraldi; M. Pidria
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Paper Abstract

In order to meet increasingly stringent emission control laws it is necessary to develop a sensor that can accurately monitor the level of pollutants entering the atmosphere from land transport vehicles. These pollutants are generally a mixture of hot gases and particulates. An optical fibre sensor is particularly well suited to this task. Due to it's small size and weight it is minimally invasive making it suitable for insertion into the vehicle's exhaust system. Optical fibres are immune from poisoning by the analyte gases, although they do require shielding from airborne particulates. As they do not transmit electricity they are also highly safe and furthermore they are immune from electromagnetic interference. To detect the presence of the gases it is proposed to use an optical absorption technique. The majority of gases of industrial and environmental importance have their fundamental absorption line in the mid-infrared region of the electromagnetic spectrum, with weaker overtones in the near infrared. Due to the greater availability of components, optimised for communications, most optical fibre gas sensing has taken place in the near-infrared region of the spectrum. In this paper mid-infrared optical fibre gas sensing techniques are investigated and the results of the investigation are presented. Due to the inhomogeneous state of the gas flow it is necessary to measure temperature especially just upstream of the after-treatment section where this can rise to as high as 650oC with large temporal gradients. Measurements of temperature of hot gases from a full size test engine using an optical fibre probe based on fluorescence decay time measurements are also presented.

Paper Details

Date Published: 3 June 2005
PDF: 12 pages
Proc. SPIE 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy, (3 June 2005); doi: 10.1117/12.606174
Show Author Affiliations
Jim Mulrooney, Univ. of Limerick (Ireland)
John Clifford, Univ. of Limerick (Ireland)
Colin Fitzpatrick, Univ. of Limerick (Ireland)
Elfed Lewis, Univ. of Limerick (Ireland)
W. Z. Zhao, City Univ. London (United Kingdom)
T. Sun, City Univ. London (United Kingdom)
K. T. V. Grattan, City Univ. London (United Kingdom)
M. Degner, Institute of General Electrical Engineering (Germany)
H. Ewald, Institute of General Electrical Engineering (Germany)
S. Lochmann, Hochschule Wismar (Germany)
A. Al-Shamma'a, Univ. of Liverpool (United Kingdom)
J. Lucas, Univ. of Liverpool (United Kingdom)
E. Merlone Borla, Ctr. Ricerche Fiat (Italy)
P. Faraldi, Ctr. Ricerche Fiat (Italy)
M. Pidria, Ctr. Ricerche Fiat (Italy)

Published in SPIE Proceedings Vol. 5826:
Opto-Ireland 2005: Optical Sensing and Spectroscopy
Gerard D. O'Sullivan; Brian D. MacCraith; Hugh James Byrne; Enda McGlynn; Alan G. Ryder, Editor(s)

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