Fiber Bragg grating strain sensor based on unbalanced Mach-Zehnder interferometer

Zhi-guo Wang; Jian-xin Li; Ri-hong Zhu

doi:10.1117/12.868793

9 November 2010 Fiber Bragg grating strain sensor based on unbalanced Mach-Zehnder interferometer

Zhi-guo Wang, Jian-xin Li, Ri-hong Zhu

Proceedings Volume 7853, Advanced Sensor Systems and Applications IV; 78531R (2010) https://doi.org/10.1117/12.868793
Event: Photonics Asia 2010, 2010, Beijing, China

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.

Citation Download Citation

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); https://doi.org/10.1117/12.868793

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