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Surface-Plasmon-Resonance-Based Optical-Fiber Micro-Displacement Sensor with Temperature Compensation

1
Chongqing Municipal Key Laboratory of Intelligent Information Processing and Control of Institutions of Higher Education, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, China
2
College of Electronic & Information Engineering, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, China
3
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
4
Department of Physics, Harbin Institute of Technology, Harbin 150001, China
5
Chongqing Engineering Research Center of Internet of Things and Intelligent Control Technology, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, China
6
Basic Medicine Department, Chongqing Three Gorges Medical College, Wanzhou, Chongqing 404100, China
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(10), 3210; https://doi.org/10.3390/s18103210
Received: 28 August 2018 / Revised: 18 September 2018 / Accepted: 22 September 2018 / Published: 23 September 2018
(This article belongs to the Special Issue Surface Plasmon Resonance Sensing 2019)
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Abstract

Micro-displacement measurements play a crucial role in many industrial applications. Aiming to address the defects of existing optical-fiber displacement sensors, such as low sensitivity and temperature interference, we propose and demonstrate a novel surface plasmon resonance (SPR)-based optical-fiber micro-displacement sensor with temperature compensation. The sensor consists of a displacement-sensing region (DSR) and a temperature-sensing region (TSR). We employed a graded-index multimode fiber (GI-MMF) to fabricate the DSR and a hetero-core structure fiber to fabricate the TSR. For the DSR, we employed a single-mode fiber (SMF) to change the radial position of the incident beam as displacement. The resonance angle in the DSR is highly sensitive to displacement; thus, the resonance wavelength of the DSR shifts. For the TSR, we employed polydimethylsiloxane (PDMS) as a temperature-sensitive medium, whose refractive index is highly sensitive to temperature; thus, the resonance wavelength of the TSR shifts. The displacement and temperature detection ranges are 0–25 μm and 20–60 °C; the displacement and temperature sensitivities of the DSR are 4.24 nm/μm and −0.19 nm/°C, and those of the TSR are 0.46 nm/μm and −2.485 nm/°C, respectively. Finally, by means of a sensing matrix, the temperature compensation was realized. View Full-Text
Keywords: fiber-optic sensors; surface plasmon resonance; displacement measurement; temperature compensation; micro-structure fiber fiber-optic sensors; surface plasmon resonance; displacement measurement; temperature compensation; micro-structure fiber
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Wei, Y.; Wu, P.; Zhu, Z.; Liu, L.; Liu, C.; Hu, J.; Wang, S.; Zhang, Y. Surface-Plasmon-Resonance-Based Optical-Fiber Micro-Displacement Sensor with Temperature Compensation. Sensors 2018, 18, 3210.

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