Cantilever Type Accelerometer Based on a Mirror-Terminated Hetero-Core Optical Fiber
Cantilever Type Accelerometer Based on a Mirror-Terminated Hetero-Core Optical Fiber
复制标题
基于镜面端接异芯光纤的悬臂梁式加速度计
DOI：
10.1109/jsen.2021.3105967
复制
发表时间：
2021
影响因子：
4.3
通讯作者：
Watanabe Kazuhiro
中科院分区：
文献类型：
--
作者：
Matsuo Akihito;Kadokura Miyuki;Yamazaki Hiroshi;Nishiyama Michiko;Watanabe Kazuhiro
本文介绍了一种用于机械故障诊断的新型悬臂梁式光纤加速度传感器。异芯光纤传感器具有对电磁干扰、化学腐蚀和温度波动等环境干扰具有鲁棒性的优点，适合现场长期测量。此外，所提出的传感器包含在异芯光纤上的反射镜终端，以形成紧凑的和波纹状的结构。实验发现，镜端异芯光纤作为马赫-曾德尔干涉法工作，在透射光谱中具有干涉条纹，其中峰值强度的线性变化使得能够使用具有成本效益的LED/PD测量仪器来检测光纤光束的偏转。对于振动响应特性，当施加正弦振动时，传感器再现输入振动的波形以改变光损耗。此外，当设置纤维梁长度为6 - 13 mm时，对于小于620 - 130 Hz的频率范围，灵敏度稳定在~dB/g的范围内。此外，有限元模拟表明，频率响应特性与波纹状纤维梁的振动特性具有良好的相关性。这意味着通过改变光纤束长度，可以在灵敏度和可测量频率范围方面优化传感器性能。
This paper describes a novel cantilever type accelerometer using a mirror-terminated hetero-core optical fiber for fault diagnosis of machinery. Hetero-core optical fiber sensors are suitable for long-term measurement in on-site fields with attractive advantages of robustness to environmental disturbances such as electromagnetic interference, chemical corrosion, and temperature fluctuation. Moreover, the proposed sensor contained a mirror termination on the hetero-core fiber in order to form a compact and cantilever-shaped structure. It was experimentally found that the mirror-terminated hetero-core fiber worked as Mach-Zehnder interferometry having interference fringes in transmission spectrum, in which linear changes in peak intensities enabled to detect the deflection of fiber beam using a cost-effective LED/PD measurement instrument. For the vibration response characteristics, the sensor reproduced the waveforms of input vibrations to optical loss changes when sinusoidal vibration was applied. Furthermore, the sensitivities were stable in the range oftodB/g for the frequency ranges less than 620–130 Hz, when setting a fiber beam length by 6–13 mm. Additionally, finite element simulations indicated that the frequency response characteristics were well correlated with the vibration characteristics of the cantilever-shaped fiber beam, which implied that the sensor performance can be optimized with respects to the sensitivity and the measurable frequency range by changing the fiber beam length.