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Proceedings Paper

Study on strain sensing of asymmetric Mach-Zehnder fiber filter
Author(s): Chunyu Liu; Hongan Ye
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Paper 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.

Paper Details

Date Published: 11 July 2009
PDF: 5 pages
Proc. SPIE 7491, PIAGENG 2009: Remote Sensing and Geoscience for Agricultural Engineering, 749104 (11 July 2009); doi: 10.1117/12.836942
Show Author Affiliations
Chunyu Liu, College of Heilongjiang Province (China)
Hongan Ye, College of Heilongjiang Province (China)


Published in SPIE Proceedings Vol. 7491:
PIAGENG 2009: Remote Sensing and Geoscience for Agricultural Engineering
Honghua Tan; Qi Luo, Editor(s)

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