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Proceedings Paper

Fibre-Optic Remote Gas Sensor With Diode Laser FM Spectroscopy
Author(s): Arman Mohebati; Terence A. King
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Paper Abstract

A fibre-optic remote gas sensor utilising the frequency modulated spectroscopy technique is described which is capable of detecting pollutants and trace gases in the atmosphere in ppm to ppb levels with an extremely high degree of specificity. The present system allows absorption measurements of 5 x 10-3% for long pathlengths in multipass White cells and approximately 10-3% for shorter pathlengths when single-mode fibre links are employed. The use of multimode fibre links can reduce the sensitivity and accuracy of the measurements. This effect is shown to be due to the modal noise in the fibre and it is demonstrated how it can be minimised by suitable data acquisition and processing techniques. Data from a fibre-optic methane sensor is presented as an example to show the typical performance of the system.

Paper Details

Date Published: 13 February 1990
PDF: 8 pages
Proc. SPIE 1172, Chemical, Biochemical, and Environmental Fiber Sensors, (13 February 1990); doi: 10.1117/12.963188
Show Author Affiliations
Arman Mohebati, University of Manchester (United Kingdom)
Terence A. King, University of Manchester (United Kingdom)


Published in SPIE Proceedings Vol. 1172:
Chemical, Biochemical, and Environmental Fiber Sensors
Robert A. Lieberman; Marek T. Wlodarczyk, Editor(s)

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