Abstract

An optic-fiber vibration sensor based on the reflected 81° tilted fiber grating (81° TFG) integrated with a symmetrical flexible hinge is proposed and experimentally demonstrated in this paper. The vibration sensor is composed of a symmetrical flexible hinge and a reflected 81° TFG, the ends of which are simply fixed on the upper surface of the mass. The theoretical model of the proposed vibration sensor is analyzed, by which the important parameters related to the resonant frequency of the sensor are simulated and discussed; then, the vibration sensing experiments are conducted. Experiment results show that TE/TM mode of the 81° TFG can provide the maximal acceleration sensitivity of 338.28 and 299.94 mV/g at 400 Hz in the flat area of the amplitude-frequency response (50–400 Hz), which is increased by 9.95 and 11.5 times as compared with the optical fiber cantilever beam structure, respectively. Further, the signal-to-noise ratio in the flat area (50–400 Hz) is about ${\sim}{66.275}\;{\rm{dB}}$ under the acceleration of 2 g, which is increased by ${\sim}{{20}}\;{\rm{dB}}$. Furthermore, it can be used for detecting mechanical vibration of medium-high frequency ranging from 50 to 3500 Hz. The proposed 81° TFG vibration sensor has the characteristics of small volume, simple package, high acceleration sensitivity, and wide vibration signal response range, which will ensure it has broad application prospects in the field of mechanical vibration.

© 2021 Optical Society of America

Design and test of a FBG acceleration sensor based on multi-stage flexible hinges

Caihua Li, Yuxin Guan, Bingbing Zhang, Lei Qiu, Jianchao Zhou, and Xingxing Hu
Appl. Opt. 62(17) 4673-4680 (2023)

Miniature bending-resistant fiber grating accelerometer based on a flexible hinge structure

Lei Liang, Hui Wang, Zichuang Li, Shu Dai, and Ke Jiang
Opt. Express 30(19) 33502-33514 (2022)

Study on vibration sensing performance of an equal strength cantilever beam based on an excessively tilted fiber grating

Binbin Luo, Wanmeng Yang, Xinyu Hu, Huafeng Lu, Shenghui Shi, Mingfu Zhao, Ye Lu, Lang Xie, Zhongyuan Sun, and Lin Zhang
Appl. Opt. 57(9) 2128-2134 (2018)

Miniaturized fiber Bragg grating accelerator sensors for low-frequency vibration monitoring

XiaoMei Wang, RuiMing Zhang, Xiaoyong Fan, YunTian Teng, and YiXiang Tang
Appl. Opt. 62(27) 7254-7262 (2023)

Cross spring leaf-based high-sensitivity low-frequency dual-FBG acceleration sensor

Yuntian Teng, Bingbing Zhang, Xiaoyong Fan, Jiemei Ma, and Zhongchao Qiu
Appl. Opt. 61(25) 7521-7531 (2022)