Hybrid fiber Bragg grating sensor for vibration and temperature monitoring of a train bearing
We report a fiber Bragg grating (FBG)-based sensor for the simultaneous measurement of a train bearing’s vibration and temperature. A pre-stretched optical fiber with an FBG and a mass is designed for axial vibration sensing. Another multiplexed FBG is embedded in a selected copper-based alloy with a high thermal expansion to detect temperature. Experiments show that the sensor possesses a high resonant frequency of 970 Hz, an acceleration sensitivity of 27.28 pm/g, and a high temperature sensitivity of 35.165 pm/°C. A resonant excitation test is also carried out that demonstrates the robustness and reliability of the sensor.
基金项目：This work was supported in part by the National Natural Science Foundation of China (Nos. 51605348 and 51605344), in part by the Natural Science Foundation of the Hubei Province (No. 2016CFB116), and in part by the Open Research Fund of the Hubei Digital Manufacturing Key Laboratory (No. SZ1801).
Yongxing Guo：Key Laboratory of Metallurgical Equipment and Control Technology, Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
Li Xiong：Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
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Xiaofeng Wang, Yongxing Guo, Li Xiong, "Hybrid fiber Bragg grating sensor for vibration and temperature monitoring of a train bearing," Chinese Optics Letters 16(7), 070604 (2018)