Liang Lei, Wang Hui, Li Zichuang, Dai Shu, Jiang Ke
Opt Express. 2022 Sep 12;30(19):33502-33514. doi: 10.1364/OE.465453.
To meet the needs of vibration monitoring with special requirements for the size and quality of accelerometers, a miniaturized fiber Bragg grating accelerometer based on flexible hinges is proposed in this paper. The sensor uses a flexible hinge as an elastic body, and the suspended arc package realizes the miniaturization of the accelerometer. At the same time, the grating prepared by bending-resistant optical fiber successfully solves the problem of light loss in arc-shaped packaging. The structural model and principle of the accelerometer are introduced, and its sensing characteristics are analyzed theoretically and by simulation. The physical size of the prepared accelerometer is 17 mm × 12 mm × 10 mm, and its mass is only 4.44 g. The experimental results show that the resonant frequency of the accelerometer is about 900 Hz, the sensitivity is 26.962 pm/g in the flat range of 20-400 Hz, and the lateral interference is less than 5%. The accelerometer is suitable for medium and low frequency vibration monitoring in narrow spaces in aerospace and other fields.
为满足对加速度计尺寸和质量有特殊要求的振动监测需求，本文提出了一种基于柔性铰链的小型化光纤布拉格光栅加速度计。该传感器采用柔性铰链作为弹性体，悬弧封装实现了加速度计的小型化。同时，由抗弯曲光纤制备的光栅成功解决了弧形封装中的光损耗问题。介绍了加速度计的结构模型和原理，并对其传感特性进行了理论分析和仿真分析。所制备加速度计的物理尺寸为17 mm × 12 mm × 10 mm，质量仅为4.44 g。实验结果表明，该加速度计的谐振频率约为900 Hz，在20 - 400 Hz的平坦范围内灵敏度为26.962 pm/g，横向干扰小于5%。该加速度计适用于航空航天等领域狭窄空间内的中低频振动监测。
