Vector fiber Bragg gratings accelerometer based on silicone compliant cylinder for low frequency vibration monitoring  

作　　者：胡文玉 陈卓 尤江山 王若晖 周锐 乔学光 Wenyu Hu;Zhuo Chen;Jiangshan You;Ruohui Wang;Rui Zhou;Xueguang Qiao(School of Physics,Northwest University,Xi’an 710127,China;Engineering Research Center of Optical Fiber Well Logging Technology for Oil and Gas Resources,Universities of Shaanxi Province,Xi’an 710127,China)

机构地区：[1]School of Physics,Northwest University,Xi’an 710127,China [2]Engineering Research Center of Optical Fiber Well Logging Technology for Oil and Gas Resources,Universities of Shaanxi Province,Xi’an 710127,China

出　　处：《Chinese Physics B》2023年第11期33-39,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 61927812, 61735014, and 62105261)。

摘　　要：Vector accelerometer has attracted much attention for its great application potential in underground seismic signal measurement. We propose and demonstrate a novel vector accelerometer based on the three fiber Bragg gratings(FBGs)embedded in a silicone rubber compliant cylinder at 120° distributed uniformly. The accelerometer is capable of detecting the orientation of vibration with a range of 0°–360° and the acceleration through monitoring the central wavelength shifts of three FBGs simultaneously. The experimental results show that the natural frequency of the accelerometer is about 85 Hz, and the sensitivity is 84.21 pm/g in the flat range of 20 Hz–60 Hz. Through experimental calibration, the designed accelerometer can accurately obtain vibration vector information, including vibration orientation and acceleration. In addition, the range of resonant frequency and sensitivity can be expanded by adjusting the hardness of the silicone rubber materials. Due to the characteristics of small size and orientation recognition, the accelerometer can be applied to low-frequency vibration acceleration vector measurement in narrow spaces.

关 键 词：fiber-optic sensor vector accelerometer silicone compliant cylinder orientation recognition 

分 类 号：TN253[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]