26 April 1989 Self Referenced Fiber Optic Methane Detection System
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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.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jacek K. Zientkiewicz, Jacek K. Zientkiewicz, } "Self Referenced Fiber Optic Methane Detection System", Proc. SPIE 0992, Fiber Optics Reliability: Benign and Adverse Environments II, (26 April 1989); doi: 10.1117/12.960044; https://doi.org/10.1117/12.960044


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