Study on strain sensing of asymmetric Mach-Zehnder fiber filter

Chunyu Liu; Hongan Ye

doi:10.1117/12.836942

10 July 2009 Study on strain sensing of asymmetric Mach-Zehnder fiber filter

Chunyu Liu, Hongan Ye

Proceedings Volume 7491, PIAGENG 2009: Remote Sensing and Geoscience for Agricultural Engineering; 749104 (2009) https://doi.org/10.1117/12.836942
Event: International Conference on Photonics and Image in Agriculture Engineering (PIAGENG 2009), 2009, Zhangjiajie, China

Abstract

An asymmetric Mach-Zehnder fiber filter was used as a substitute for fiber Bragg grating sensor, in order to solve the problem of cross-sensitivity between strain and temperature, while the characteristics of wavelength encoding were retained. In this paper, sensing characteristics of an asymmetric Mach-Zehnder fiber filter was analyzed theoretically. The result showed that the frequency separation of an asymmetric Mach-Zehnder fiber filter had a nearly linear relationship with the strain pressed on it. This conclusion had been verified by experiments. In our experiment, a cantilever beam was employed to tune strain on the asymmetric Mach-Zehnder fiber filter. Changing of frequency separation was used to describe the size of the strain. When variation of strain was about 1300 με, the changing of frequency separation would be about 6 THz. While, when temperature varied between 20°C and 70°C, the changing of frequency separation would not more than 0.02 THz. The structure of strain sensors had the advantage of wavelength encoding. At the same time; temperature change on the effects of strain sensing had been eliminated. It could be used for fiber-optic sensor to measure strain changes.

Citation Download Citation

Chunyu Liu and Hongan Ye "Study on strain sensing of asymmetric Mach-Zehnder fiber filter", Proc. SPIE 7491, PIAGENG 2009: Remote Sensing and Geoscience for Agricultural Engineering, 749104 (10 July 2009); https://doi.org/10.1117/12.836942

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