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Proceedings Paper

Temperature-independent fiber Bragg grating micro-displacement sensor
Author(s): Tuan Guo; Qida Zhao; Lifang Xue; Guiling Huang; Shiyu Gao; Yu Yan; Luming Zhao; Lihui Liu
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Paper Abstract

Temperature-independent micro-displacement measurement using a single fiber Bragg grating based on broadened reflection spectrum is proposed and experimentally demonstrated. The structure of specially designed bending cantilever beam (BCB) is proposed. The BCB induces axial strain gradient along the sensing FBG, resulting in a Bragg bandwidth modulation. The broadening of FBG spectrum bandwidth and the reflected optical power correspond to micro-displacement changes, insensitive to spatially uniform temperature variations. For a displacement variation of 20mm and a temperature change from 20°C to 100°C, the micro-displacement measurement deviation error is ±0.12mm without any temperature compensation. Through optical power detecting by a pin photodiode (PD), the micro-displacement sensor avoids complex demodulation process and potentially costs little.

Paper Details

Date Published: 10 June 2006
PDF: 7 pages
Proc. SPIE 6344, Advanced Laser Technologies 2005, 634433 (10 June 2006); doi: 10.1117/12.694436
Show Author Affiliations
Tuan Guo, Nankai Univ. (China)
Qida Zhao, Nankai Univ. (China)
Lifang Xue, Nankai Univ. (China)
Guiling Huang, Nankai Univ. (China)
Shiyu Gao, Nankai Univ. (China)
Yu Yan, Nankai Univ. (China)
Luming Zhao, Nankai Univ. (China)
Lihui Liu, Nankai Univ. (China)

Published in SPIE Proceedings Vol. 6344:
Advanced Laser Technologies 2005
Ivan A. Shcherbakov; Kexin Xu; Qingyue Wang; Alexander V. Priezzhev; Vladimir I. Pustovoy, Editor(s)

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