Li Tianliang, Tan Yuegang, Wei Li, Zhou Zude, Zheng Kai, Guo Yongxing
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, Hubei, China.
National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan, Hubei, China.
Rev Sci Instrum. 2014 Jan;85(1):015002. doi: 10.1063/1.4857755.
A non-contact vibration sensor based on fiber Bragg grating (FBG) sensing has been proposed and studied in this paper. The principle of the sensor as well as simulation and experimental analyses are introduced. When the distance between the movable head and the measured shaft changed, the diaphragm deformed under magnetic coupling of the permanent magnet on the measured magnetic shaft. As a result, the center wavelength of the FBG connected to the diaphragm changed, based on which the vibration displacement of the rotating shaft could be obtained. Experimental results show that the resonant frequency of the sensor is about 1500 Hz and the working band ranges within 0-1300 Hz, which is consistent with the simulation analysis result; the sensitivity is -1.694 pm/μm and the linearity is 2.92% within a range of 2-2.4 mm. It can be used to conduct non-contact measurement on the vibration of the rotating shaft system.
本文提出并研究了一种基于光纤布拉格光栅（FBG）传感的非接触式振动传感器。介绍了该传感器的原理以及仿真和实验分析。当可动头与被测轴之间的距离发生变化时，隔膜在被测磁轴上永磁体的磁耦合作用下发生变形。结果，与隔膜相连的FBG的中心波长发生变化，据此可获得旋转轴的振动位移。实验结果表明，该传感器的谐振频率约为1500Hz，工作频段在0 - 1300Hz范围内，与仿真分析结果一致；在2 - 2.4mm范围内，灵敏度为-1.694pm/μm，线性度为2.92%。它可用于对旋转轴系统的振动进行非接触测量。
