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Proceedings Paper

Fiber-optic curvature sensor based on step-index multimode fiber
Author(s): Yuan Gong; Tian Zhao; Yun-Jiang Rao; Yu Wu; Hui-Juan Wu
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Paper 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.

Paper Details

Date Published: 23 November 2011
PDF: 6 pages
Proc. SPIE 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 81990T (23 November 2011); doi: 10.1117/12.904127
Show Author Affiliations
Yuan Gong, Univ. of Electronic Science and Technology of China (China)
Chongqing Univ. of Technology (China)
Tian Zhao, Univ. of Electronic Science and Technology of China (China)
Yun-Jiang Rao, Univ. of Electronic Science and Technology of China (China)
Yu Wu, Univ. of Electronic Science and Technology of China (China)
Hui-Juan Wu, Univ. of Electronic Science and Technology of China (China)


Published in SPIE Proceedings Vol. 8199:
2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications

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