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Proceedings Paper

Self Referenced Fiber Optic Methane Detection System
Author(s): Jacek K. Zientkiewicz
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Paper Abstract

A fiber optic multisensor methane detection system matched to topology and environment of a coal mine is reported. The system involves time domain multiplexed (TDM) methane sensors based on selective absorption of source radiation by atomic or 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 upon spectral resolution of the optical filters has also been investigated and described. The system performance was evaluated and the results are presented.

Paper Details

Date Published: 26 April 1989
PDF: 8 pages
Proc. SPIE 0992, Fiber Optics Reliability: Benign and Adverse Environments II, (26 April 1989); doi: 10.1117/12.960044
Show Author Affiliations
Jacek K. Zientkiewicz, Lublin Technical University (Poland)


Published in SPIE Proceedings Vol. 0992:
Fiber Optics Reliability: Benign and Adverse Environments II
Roger A. Greenwell; Dilip K. Paul; Shekhar G. Wadekar, Editor(s)

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