Fiber-optic curvature sensor based on step-index multimode fiber

Yuan Gong; Tian Zhao; Yun-Jiang Rao; Yu Wu; Hui-Juan Wu

doi:10.1117/12.904127

22 November 2011 Fiber-optic curvature sensor based on step-index multimode fiber

Yuan Gong, Tian Zhao, Yun-Jiang Rao, Yu Wu, Hui-Juan Wu

Proceedings Volume 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 81990T (2011) https://doi.org/10.1117/12.904127
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

A fiber-optic curvature sensor based on the singlemode-multimode-singlemode (SMS) fiber structure is developed. Several notches in the transmitted spectrum of the SMS fiber structure are generated due to the multimode interference effect. The dependence of the wavelength shifts and intensity changes of three transmission notches on the applied curvature are different from each other. The maximum sensitivities of wavelength-curvature and intensity-curvature relationships are - 10.38 nm/m^-1 and - 130.37 dB/m^-1, respectively. By properly choosing to measure wavelength shifts or intensity changes, high sensitivity measurement of curvature over a large scale can be obtained. The wavelength of the second notch is insensitive to the curvature change, offering the possibility for simultaneous measurement of curvature and other parameters such as temperature or strain.

Citation Download Citation

Yuan Gong, Tian Zhao, Yun-Jiang Rao, Yu Wu, and Hui-Juan Wu "Fiber-optic curvature sensor based on step-index multimode fiber", Proc. SPIE 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 81990T (22 November 2011); https://doi.org/10.1117/12.904127

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