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Proceedings Paper

Fiber Bragg grating strain sensor based on unbalanced Mach-Zehnder interferometer
Author(s): Zhi-guo Wang; Jian-xin Li; Ri-hong Zhu
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Paper Abstract

The demodulations of the Bragg wavelength shifts are significant and gaining more and more interesting. Detecting the wavelength shifts based on the interferometry has a very high sensitivity. The unbalanced Mach-Zehnder interferometer system can translate the Bragg wavelength of FBGs caused by the strain into the phase information. The tested strain can be obtained through the phase variation by the three-step phase-shifting method. A finite element model is built up and theoretical analysis has been done. Series experiments measuring the strain properties of the cantilever are carried on. The results show that the tested strain and the changed phase have a linear relationship. The unbalanced Mach-Zehnder interferometer system owns a high-sensitivity and accuracy.

Paper Details

Date Published: 9 November 2010
PDF: 9 pages
Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78531R (9 November 2010); doi: 10.1117/12.868793
Show Author Affiliations
Zhi-guo Wang, Nanjing Univ. of Science and Technology (China)
Jian-xin Li, Nanjing Univ. of Science and Technology (China)
Ri-hong Zhu, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 7853:
Advanced Sensor Systems and Applications IV
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan; Lin Zhang, Editor(s)

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