Self Referenced Fiber Optic Methane Detection System

Jacek K. Zientkiewicz

doi:10.1117/12.960044

26 April 1989 Self Referenced Fiber Optic Methane Detection System

Jacek K. Zientkiewicz

Proceedings Volume 0992, Fiber Optics Reliability: Benign and Adverse Environments II; (1989) https://doi.org/10.1117/12.960044
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

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.

Citation Download Citation

Jacek K. Zientkiewicz "Self Referenced Fiber Optic Methane Detection System", Proc. SPIE 0992, Fiber Optics Reliability: Benign and Adverse Environments II, (26 April 1989); https://doi.org/10.1117/12.960044

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