Fibre-Optic Remote Gas Sensor With Diode Laser FM Spectroscopy

Arman Mohebati; Terence A. King

doi:10.1117/12.963188

13 February 1990 Fibre-Optic Remote Gas Sensor With Diode Laser FM Spectroscopy

Arman Mohebati, Terence A. King

Proceedings Volume 1172, Chemical, Biochemical, and Environmental Fiber Sensors; (1990) https://doi.org/10.1117/12.963188
Event: OE/FIBERS '89, 1989, Boston, United States

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.

Citation Download Citation

Arman Mohebati and Terence A. King "Fibre-Optic Remote Gas Sensor With Diode Laser FM Spectroscopy", Proc. SPIE 1172, Chemical, Biochemical, and Environmental Fiber Sensors, (13 February 1990); https://doi.org/10.1117/12.963188

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