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9 November 2010 Fiber Bragg grating strain sensor based on unbalanced Mach-Zehnder interferometer
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zhi-guo Wang, Jian-xin Li, and Ri-hong Zhu "Fiber Bragg grating strain sensor based on unbalanced Mach-Zehnder interferometer", Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78531R (9 November 2010); doi: 10.1117/12.868793; https://doi.org/10.1117/12.868793
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