Liu Mingyao, Wang Wenzhi, Song Han, Zhou Shiguang, Zhou Weijian
School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China.
Hubei Digital Manufacturing Key Laboratory, Wuhan University of Technology, Wuhan 430070, Hubei, China.
Sensors (Basel). 2019 Apr 24;19(8):1931. doi: 10.3390/s19081931.
For the purpose of improving the sensitivity of the fiber Bragg grating (FBG)-based strain sensor. A novel FBG-based strain sensor with high sensibility was designed by means of a flexible hinge bridge displacement magnification structure. This sensor can be used to accurately measure the strain of a mechanical structure surface. In this paper, the strain sensitization amplification factor of the sensor was calculated by using the flexible matrix method and the strain energy theory. The magnification had been verified by using simulation analysis and experimental results, and the error between theoretical calculation and simulation analysis was less than 7%. The result shows that the strain sensitivity of the sensor is 10.84 pm/με, which is about 10 times to that of the bare FBG sensor. This sensor is sensitive to micro-strain, so it can be well applied to health monitoring of a mechanical system.
为了提高基于光纤布拉格光栅（FBG）的应变传感器的灵敏度。采用柔性铰链桥位移放大结构设计了一种新型的高灵敏度基于FBG的应变传感器。该传感器可用于精确测量机械结构表面的应变。本文利用柔性矩阵法和应变能理论计算了传感器的应变敏感放大系数。通过仿真分析和实验结果验证了放大倍数，理论计算与仿真分析之间的误差小于7%。结果表明，该传感器的应变灵敏度为10.84 pm/με，约为裸FBG传感器的10倍。该传感器对微应变敏感，因此可很好地应用于机械系统的健康监测。
