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Proceedings Paper

Temperature-independent fiber Bragg grating liquid-level sensor based on reflection optical power detection
Author(s): Tuan Guo; Qida Zhao; Lifang Xue; Guiling Huang; Shiyu Gao; Yan Yu; Luming Zhao; Lihui Liu
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Paper Abstract

Design and construction of temperature-insensitive fiber Bragg grating (FBG) liquid level sensor based on bending cantilever beam (BCB) is proposed and demonstrated. The BCB induces spatially gradient strain on the unique sensing FBG, resulting in a Bragg bandwidth modulation. The broadening of FBG spectrum bandwidth and the reflected optical power are corresponded to liquid level changes, insensitive to spatially uniform temperature variations. In the liquid-level range of 500 mm and temperature change from 20oC to 80oC, the liquid level measurement fluctuates less than 2% without any temperature compensation. By a pin-photodiode (PD) optical power detecting, the liquid-level sensor avoids expensive and complex demodulation techniques and potentially costs low.

Paper Details

Date Published: 6 December 2005
PDF: 5 pages
Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 60191W (6 December 2005); doi: 10.1117/12.637060
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)
Yan Yu, Nankai Univ. (China)
Luming Zhao, Nankai Univ. (China)
Lihui Liu, Nankai Univ. (China)


Published in SPIE Proceedings Vol. 6019:
Passive Components and Fiber-based Devices II
Yan Sun; Jianping Chen; Sang Bae Lee; Ian H. White, Editor(s)

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