Research of surface plasma resonance optical fiber hydrogen sensor

Zhonghua Ou; Xiaowei Guo; Dejun Chen; Zhiyong Dai; Zengshou Peng; Yongzhi Liu

doi:10.1117/12.807109

2 February 2009 Research of surface plasma resonance optical fiber hydrogen sensor

Zhonghua Ou, Xiaowei Guo, Dejun Chen, Zhiyong Dai, Zengshou Peng, Yongzhi Liu

Proceedings Volume 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications; 715716 (2009) https://doi.org/10.1117/12.807109
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

An optical fiber hydrogen sensor based on the measuring principle of surface plasma resonance is introduced. The structure of the hydrogen-sensitive head which is coated with Pd-Ag alloy film on the surface of the etched optical fiber is investigated theoretically. When hydrogen gas is absorbed into the Pd thin layer of the sensing head, the Pd hydride is formed and then the refraction index of the etched optical fiber surface will be changed with different hydrogen gas concentration. The surface plasma wave is stimulated by the light wave in optical fiber and the surface plasma resonance occurs between the thin metal layer and the medium surface of hydrogen gas. The Pd-Ag alloy film thickness versus the sensitivity of hydrogen sensing head is analyzed and optimized via the numerical method. The sensing head which is based on surface plasma resonance is manufactured and used in the experiment system of hydrogen gas detecting, and the experiment results demonstrate that the detecting system has high sensitivity with the hydrogen concentration in the range of 0%-4%, the accuracy, resolution and response time are respectively 5%, 0.1% and 30s. This sensor structure can be applied to detecting the low concentration of hydrogen gas.

Citation Download Citation

Zhonghua Ou, Xiaowei Guo, Dejun Chen, Zhiyong Dai, Zengshou Peng, and Yongzhi Liu "Research of surface plasma resonance optical fiber hydrogen sensor", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 715716 (2 February 2009); https://doi.org/10.1117/12.807109

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