Remote methane sensor using raman amplified open path TDLS
Mitchell, D.M. and Duffin, K. and Johnstone, W. (2009) Remote methane sensor using raman amplified open path TDLS. In: 7th International Conference on Tunable Diode Laser Spectroscopy, 2009-07-13 - 2009-07-17.
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Reported here is a long-range optical methane sensor designed with the purpose of enabling more efficient leak monitoring of natural gas pipelines, oil rigs and gas containers including ships. Combining sensitive Wavelength Modulation Spectroscopy (WMS) and a high power Raman amplifier system, the sensor launches a high power 1650.95nm signal at an inspection site at a distance of around 100m and analyses the backscatter via a large Fresnel lens to detect methane concentrations of 100ppm in a 1m gas cloud up to 100%. The work comprises the design and testing of a low-noise high-power fibre Raman amplifier system as a remote methane sensing source. Seeded by a single-mode 1650.95nm laser (DFB), upon which the WMS modulation is applied, the Raman amplifier produces a highpower, narrow-band methane sensing signal. Key to the system’s competitive advantage is its low cost, small size, low weight, high reliability and superior performance when compared to bulk long-range airborne systems. This results from designing a fibre based system that is constructed entirely from standard communications fibre and components. Lab trials at 11m have been conducted and show by extrapolation that a 1m cloud of methane at a concentration of 100ppm can be detected with a signal to noise ratio of 3:1 at a range of >100m.
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Item type: Conference or Workshop Item(Paper) ID code: 14798 Dates: DateEventJuly 2009PublishedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Strathprints Administrator Date deposited: 16 May 2011 13:33 Last modified: 02 Aug 2024 02:42 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/14798