A fiber-optic methane gas sensor system with improved accuracy using absorption-spectrum matched comb filter

Duan Liu; Ming Tang; Zhiyong Zhao; Songnian Fu; Deming Liu; P. Shum

doi:10.1117/12.970614

7 November 2012 A fiber-optic methane gas sensor system with improved accuracy using absorption-spectrum matched comb filter

Duan Liu, Ming Tang, Zhiyong Zhao, Songnian Fu, Deming Liu, P. Shum

Author Affiliations +

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 842165 (2012) https://doi.org/10.1117/12.970614
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

A fiber-optic methane gas sensor system is proposed and demonstrated with accurate gas concentration measurement with a sensitivity of ~410ppm. We employ the polarization-maintaining photonic crystal fiber (PM-PCF) based Sagnac loop filter to slice the spectrum of broadband light source so as to precisely match multiple absorption lines of the methane gas. Meanwhile, a compact gas cell with multiple reflections is designed to enhance the interaction between methane gas and the light beam. The proposed gas sensor is verified as low cost, temperature-insensitive, and high sensitivity.

Citation Download Citation

Duan Liu, Ming Tang, Zhiyong Zhao, Songnian Fu, Deming Liu, and P. Shum "A fiber-optic methane gas sensor system with improved accuracy using absorption-spectrum matched comb filter", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842165 (7 November 2012); https://doi.org/10.1117/12.970614

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