Temperature-Independent Fiber Bragg Grating Micro-displacement Sensor

Guo Tuan; Zhao Qida; Liu Lihui; Huang Guiling; Xue Lifang; Yan Yu; Gao Shiyu

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Temperature-Independent Fiber Bragg Grating Micro-displacement Sensor

Guo Tuan *,Zhao Qida ,Liu Lihui ,Huang Guiling ,Xue Lifang,Yan Yu ,Gao Shiyu

the Institute of Modern Optics, Nankai University

*Correspondence author

#Submitted by

Subject:

Funding: 教育部博士点基金（No.20020055036）

Opened online:11 August 2005

Accepted by: none

Citation: Guo Tuan ,Zhao Qida ,Liu Lihui .Temperature-Independent Fiber Bragg Grating Micro-displacement Sensor[OL]. [11 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2644

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 are corresponded to micro-displacement changes, insensitive to spatially uniform temperature variations. For a displacement variation of 20mm and a temperature change from 20℃ to 100℃, the micro-displacement measurement deviation error of 0.48mm without any temperature compensation. Through optical power detecting by a pin-photodiode (PD), the micro-displacement sensor avoids complex demodulation process and potentially costs low.

Keywords:Bending cantilever beam, fiber Bragg gratings, micro-displacement sensor, temperature-independent.

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