Temperature-independent fiber Bragg grating liquid-level sensor based on reflection optical power detection

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

doi:10.1117/12.637060

5 December 2005 Temperature-independent fiber Bragg grating liquid-level sensor based on reflection optical power detection

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

Author Affiliations +

Proceedings Volume 6019, Passive Components and Fiber-based Devices II; 60191W (2005) https://doi.org/10.1117/12.637060
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China

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 20^oC to 80^oC, 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.

Citation Download Citation

Tuan Guo, Qida Zhao, Lifang Xue, Guiling Huang, Shiyu Gao, Yan Yu, Luming Zhao, and Lihui Liu "Temperature-independent fiber Bragg grating liquid-level sensor based on reflection optical power detection", Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 60191W (5 December 2005); https://doi.org/10.1117/12.637060

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