Four-layer d-shaped optical fiber surface plasmon resonance sensor for high-sensitivity strain measurement

Yu-Lung Lo; Chin-Ho Chuang; Zheng-Wei Lin

doi:10.1117/12.914227

30 January 2012 Four-layer d-shaped optical fiber surface plasmon resonance sensor for high-sensitivity strain measurement

Yu-Lung Lo, Chin-Ho Chuang, Zheng-Wei Lin

Author Affiliations +

Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 83512F (2012) https://doi.org/10.1117/12.914227
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

Abstract

A four-layer D-shaped optical fiber surface plasmon resonance (SPR) for high-sensitivity polarimetric strain sensor is proposed. In contrast to existing SPR-based sensors, which are based on changes in the refractive index of the over-layer, the sensor proposed in this study is based on the change in the refractive index of the fiber core in response to the application of an axial load. Specifically, the phase difference between the P- and S-waves after passing through the sensor under SPR conditions is measured using a common-path heterodyne interferometer and is used to determine the corresponding change in the refractive index of the core. The experimental results show that the sensitivity of the proposed sensor is around 2.19×104 Deg./ε, i.e., degree/strain. By contrast, that of a conventional (non-SPR) polarimetric fiber sensor is just 5.2×102 Deg./ε.

Citation Download Citation

Yu-Lung Lo, Chin-Ho Chuang, and Zheng-Wei Lin "Four-layer d-shaped optical fiber surface plasmon resonance sensor for high-sensitivity strain measurement", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83512F (30 January 2012); https://doi.org/10.1117/12.914227

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