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Sensors 2018, 18(8), 2608; https://doi.org/10.3390/s18082608

Surface-Plasmon-Resonance-Based Optical Fiber Curvature Sensor with Temperature Compensation by Means of Dual Modulation Method

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
Basic Medicine Department, Chongqing Three Gorges Medical College, Wanzhou, Chongqing 404100, China
4
Chongqing Engineering Research Center of Internet of Things and Intelligent Control Technology, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, China
5
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
6
Department of Physics, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Received: 23 July 2018 / Revised: 3 August 2018 / Accepted: 5 August 2018 / Published: 9 August 2018
(This article belongs to the Special Issue Surface Plasmon Resonance Sensing 2018)
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Abstract

Curvature measurement plays an important role in many fields. Aiming to overcome shortcomings of the existing optical fiber curvature sensors, such as complicated structure and difficulty in eliminating temperature noise, we proposed and demonstrated a simple optical fiber curvature sensor based on surface plasmon resonance. By etching cladding of the step-index multimode fiber and plating gold film on the bare core, the typical Kretschmann configuration is implemented on fiber, which is used as the bending-sensitive region. With increases in the curvature of the optical fiber, the resonance wavelength of the SPR (Surface Plasmon Resonance) dip linear red-shifts while the transmittance decreases linearly. In the curvature range between 0 and 9.17 m−1, the wavelength sensitivity reached 1.50 nm/m−1 and the intensity sensitivity reached −3.66%/m−1. In addition, with increases in the ambient temperature, the resonance wavelength of the SPR dips linearly blueshifts while the transmittance increases linearly. In the temperature range between 20 and 60 °C, the wavelength sensitivity is −0.255 nm/°C and the intensity sensitivity is 0.099%/°C. The sensing matrix is built up by combining the aforementioned four sensitivities. By means of the dual modulation method, the cross-interference caused by temperature change is eliminated. Additionally, simultaneous measurement of curvature and temperature is realized. View Full-Text
Keywords: fiber optics sensors; surface plasmon resonance; curvature measurement; dual-modulation method; temperature compensation fiber optics sensors; surface plasmon resonance; curvature measurement; dual-modulation method; temperature compensation
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Su, Y.; Wei, Y.; Zhang, Y.; Liu, C.; Nie, X.; Zhu, Z.; Liu, L. Surface-Plasmon-Resonance-Based Optical Fiber Curvature Sensor with Temperature Compensation by Means of Dual Modulation Method. Sensors 2018, 18, 2608.

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