Self-Referenced Fiber Optic System For Remote Methane Detection

Jacek K. Zientkiewicz

doi:10.1117/12.960997

29 October 1989 Self-Referenced Fiber Optic System For Remote Methane Detection

Jacek K. Zientkiewicz

Author Affiliations +

Proceedings Volume 1120, Fibre Optics '89; (1989) https://doi.org/10.1117/12.960997
Event: Sira/Fibre Optics '89, 1989, London, United Kingdom

Abstract

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.

Citation Download Citation

Jacek K. Zientkiewicz "Self-Referenced Fiber Optic System For Remote Methane Detection", Proc. SPIE 1120, Fibre Optics '89, (29 October 1989); https://doi.org/10.1117/12.960997

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