A Fiber Bragg Grating Sensing Based Triaxial Vibration Sensor

作者：Li, Tianliang; Tan, Yuegang^*; Liu, Yi; Qu, Yongzhi; Liu, Mingyao; Zhou, Zude

来源：Sensors (Switzerland), 2015, 15(9): 24214-24229.

DOI：10.3390/s150924214

• fiber Bragg grating
• triaxial
• vibration sensor

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.

• 出版日期2015-9
• 单位武汉理工大学