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29 October 1989 Self-Referenced Fiber Optic System For Remote Methane Detection
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Proceedings Volume 1120, Fibre Optics '89; (1989)
Event: Sira/Fibre Optics '89, 1989, London, United Kingdom
The paper discusses a fiber optic multisensor methane detection system matched to topology and environment of the underground mine. The system involves time domain multiplexed (TDM) methane sensors based on selective absorption of source radiation by atomic/molecular species in the gas sensing heads. A two-wavelength ratiometric approach allows simple self-referencing, cancels out errors arising from other contaminants, and improves the measurement contrast. The laboratory system consists of a high radiance LED source, multimode fiber, optical sensing head, optical bandpass filters, and involves synchronous detection with low noise photodiodes and a lock-in amplifier. Detection sensitivity versus spectral resolution of the optical filters has also been investigated and described. The system performance was evaluated and the results are presented.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jacek K. Zientkiewicz "Self-Referenced Fiber Optic System For Remote Methane Detection", Proc. SPIE 1120, Fibre Optics '89, (29 October 1989);


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