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Design of a portable optical sensor for methane gas detection

Massie, Crawford and Stewart, George and McGregor, George and Gilchrist, John R. (2006) Design of a portable optical sensor for methane gas detection. Sensors and Actuators B: Chemical, 113 (2). pp. 830-836. ISSN 0925-4005

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Abstract

A detailed investigation has been carried out on the design of a low-cost portable optical sensor for methane detection with a sensitivity of not, vert, similar1% of the Lower Explosive Level (LEL) for methane (500 ppm) and able to operate in harsh environments with temperature variation between −20 and 50 °C. The sensor design is based on the use of near-IR LEDs operating around the overtone absorption lines of methane at 1660 nm using a stainless steel tube to direct the light through the gas to the detectors. Various configurations of source/detector layout have been examined to provide appropriate reference and signal paths in order to achieve reliable methane detection at LEL levels in the presence of temperature variation. An optimum design has been identified using two detectors with appropriate optical filtering and with temperature stabilisation of the source and detectors. Based on this design, a prototype instrument has been demonstrated with an ultimate sensitivity of 0.2% LEL methane (100 ppm).

Item type: Article
ID code: 7111
Keywords: methane sensor, optical gas sensor, portable gas sensor, hydrocarbon gas sensor, Electrical engineering. Electronics Nuclear engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Professional Services > West of Scotland KTP Centre
Unknown Department
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 05 Nov 2008
    Last modified: 12 Mar 2012 10:46
    URI: http://strathprints.strath.ac.uk/id/eprint/7111

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