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Appl. Sci. 2019, 9(2), 286; https://doi.org/10.3390/app9020286

Temperature Sensing of Stepped-Metal Coated Optical Fiber Bragg Grating with the Restructured Dual-Peak Resonance

1
Key Lab for Robot & Welding Automation of Jiangxi Province, School of Mechatronic Engineering, Nanchang University, Nanchang 330031, Jiangxi, China
2
Multi-Scale Additive Manufacturing Laboratory, Department of Mechanical & Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
*
Author to whom correspondence should be addressed.
Received: 19 December 2018 / Revised: 11 January 2019 / Accepted: 11 January 2019 / Published: 15 January 2019
(This article belongs to the Special Issue Fiber Bragg Gratings: Fundamentals, Materials and Applications)
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Abstract

This paper demonstrates a method for the development of stepped-metal coating on optical fiber Bragg grating. The paper also analyzes the dual-peak resonance restructured by the nickel/copper stepped-metal coating. According to the coefficients of linear thermal expansion of the coatings, the modeling and experimental analysis is categorized into three types: Type A, Type B, and Type C. We denote the temperature sensitivity difference between the two peaks as ΔKT for Type A, ΔKT for Type B, and ΔKT for Type C. The experimental results show that ΔKT, ΔKT, and ΔKT are 2.1 pm/°C, 6.5 pm/°C, and 0.8 pm/°C, respectively. The model analysis and the experimental results all show the Type B stepped-metal coating causes the most obvious temperature sensitivity difference between the two resonance peaks. The stepped-metal coating on the same one Bragg grating can restructure the single resonance into dual-peak resonance with different temperature sensing, and Type B can be used to develop a dual-parameter optical fiber Bragg grating sensor at one location which can measure two physical parameters simultaneously. View Full-Text
Keywords: optical fiber Bragg grating; stepped-metal coating; temperature sensing; restructured dual-peak resonance optical fiber Bragg grating; stepped-metal coating; temperature sensing; restructured dual-peak resonance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Feng, Y.; Toyserkani, E.; Zhang, H.; Zhang, Z.-D. Temperature Sensing of Stepped-Metal Coated Optical Fiber Bragg Grating with the Restructured Dual-Peak Resonance. Appl. Sci. 2019, 9, 286.

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