A Fiber Bragg Grating Sensing Based Triaxial Vibration Sensor

Sensors

Tianliang Li²  Yuegang Tan¹  Yi Liu²  Yongzhi Qu²  Mingyao Liu²  Zude Zhou² 

[1] School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China;

关键词: fiber Bragg grating;    triaxial;    vibration sensor;   

DOI  :  10.3390/s150924214

来源: mdpi

【 摘 要 】

A fiber Bragg grating (FBG) sensing based triaxial vibration sensor has been presented in this paper. The optical fiber is directly employed as elastomer, and the triaxial vibration of a measured body can be obtained by two pairs of FBGs. A model of a triaxial vibration sensor as well as decoupling principles of triaxial vibration and experimental analyses are proposed. Experimental results show that: sensitivities of 86.9 pm/g, 971.8 pm/g and 154.7 pm/g for each orthogonal sensitive direction with linearity are separately 3.64%, 1.50% and 3.01%. The flat frequency ranges reside in 20–200 Hz, 3–20 Hz and 4–50 Hz, respectively; in addition, the resonant frequencies are separately 700 Hz, 40 Hz and 110 Hz in the x/y/z direction. When the sensor is excited in a single direction vibration, the outputs of sensor in the other two directions are consistent with the outputs in the non-working state. Therefore, it is effectively demonstrated that it can be used for three-dimensional vibration measurement.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.