16 February 2018 Continuous liquid level detection based on two parallel plastic optical fibers in a helical structure
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Abstract
A simple and low-cost continuous liquid-level sensor based on two parallel plastic optical fibers (POFs) in a helical structure is presented. The change in the liquid level is determined by measuring the side-coupling power in the passive fiber. The side-coupling ratio is increased by just filling the gap between the two POFs with ultraviolet-curable optical cement, making the proposed sensor competitive. The experimental results show that the side-coupling power declines as the liquid level rises. The sensitivity and the measurement range are flexible and affected by the geometric parameters of the helical structure. A higher sensitivity of 0.0208    μ W / mm is acquired for a smaller curvature radius of 5 mm, and the measurement range can be expanded to 120 mm by enlarging the screw pitch to 40 mm. In addition, the reversibility and temperature dependence are studied. The proposed sensor is a cost-effective solution offering the advantages of a simple fabrication process, good reversibility, and compensable temperature dependence.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yingzi Zhang, Yingzi Zhang, Yulong Hou, Yulong Hou, Yanjun Zhang, Yanjun Zhang, Yanjun Hu, Yanjun Hu, Liang Zhang, Liang Zhang, Xiaolong Gao, Xiaolong Gao, Huixin Zhang, Huixin Zhang, Wenyi Liu, Wenyi Liu, } "Continuous liquid level detection based on two parallel plastic optical fibers in a helical structure," Optical Engineering 57(2), 026112 (16 February 2018). https://doi.org/10.1117/1.OE.57.2.026112 . Submission: Received: 6 November 2017; Accepted: 30 January 2018
Received: 6 November 2017; Accepted: 30 January 2018; Published: 16 February 2018
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