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Open AccessArticle

Design and Analysis of a Combined Strain–Vibration–Temperature Sensor with Two Fiber Bragg Gratings and a Trapezoidal Beam

by 1,†, 1,2,3,4,*,†, 1, 1, 5, 1, 6 and 1
1
State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
Collaborative Innovation Center of High-End Manufacturing Equipment, Xi’an Jiaotong University, Xi’an 710054, China
3
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai 200240, China
4
Xi’an Jiaotong University Suzhou Institute, Suzhou 215123, China
5
School of Electrical Engineering and Telecommunications, UNSW, Sydney, NSW 2052, Australia
6
Northwest A&F University, Xianyang 712100, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work and should be considered co-first authors.
Sensors 2019, 19(16), 3571; https://doi.org/10.3390/s19163571
Received: 20 May 2019 / Revised: 8 August 2019 / Accepted: 14 August 2019 / Published: 16 August 2019
(This article belongs to the Section Physical Sensors)
A combined sensor to simultaneously measure strain, vibration, and temperature has been developed. The sensor is composed of two Fiber Bragg gratings (FBGs) and a vibration gainer. One FBG is used to measure strain, while the other measures vibration and temperature. The gainer has a mass block which is used to increase its sensitivity to vibration. The main beam of the vibration gainer was designed as a trapezoid in order to reduce the strain gradient while sensing vibration. In addition, an interrogation method was used to eliminate interactions between measured parameters. Experiments were carried out to analyze the performance of the proposed sensor. For individual strain measurement in the range of 0–152 με, the sensitivity and nonlinearity error were 1.878 pm/με and 2.43% Full Scale (F.S.), respectively. For individual temperature measurement in the range of 50–210 °C, the sensitivity and nonlinearity error were 29.324 pm/°C and 1.88% F.S., respectively. The proposed sensor also demonstrated a sensitivity of 0.769 pm/m·s−2 and nonlinearity error of 1.83% F.S. for vibration measurement in the range of 10–55 m/s2. Finally, simultaneously measuring strain, temperature, and vibration resulted in nonlinearity errors of 4.23% F.S., 1.89% F.S., and 2.23% F.S., respectively. View Full-Text
Keywords: combined FBG sensor; trapezoidal beam; vibration sensing; strain sensing; temperature sensing; simultaneously sensing combined FBG sensor; trapezoidal beam; vibration sensing; strain sensing; temperature sensing; simultaneously sensing
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Yao, K.; Lin, Q.; Jiang, Z.; Zhao, N.; Peng, G.-D.; Tian, B.; Jia, W.; Yang, P. Design and Analysis of a Combined Strain–Vibration–Temperature Sensor with Two Fiber Bragg Gratings and a Trapezoidal Beam. Sensors 2019, 19, 3571.

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