Special Microstructured Optical Fiber Based Vibration Sensor and Its Application in Railway Monitoring

被引：0

作者：

Liu Z. ^{[1
,2
]}

Lin H. ^{[3
]}

Liu Y. ^{[4
]}

Chung W.-H. ^{[2
,3
]}

Tam H.-Y. ^{[3
]}

机构：

[1] School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou

[2] Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai), Zhuhai

[3] Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong

[4] School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan

来源：

Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2022年 / 58卷 / 08期

关键词：

Acceleration; Microstructured optical fiber; Structural health monitoring; Vibration sensor;

D O I：

10.3901/JME.2022.08.063

中图分类号：

学科分类号：

摘要：

In this paper, a special microstructured optical fiber based vibration sensor is proposed and experimentally employed in the structural health monitoring of railway. To achieve this, the vibration sensor based on Sagnac interferometer was designed and fabricated. By optimizing the structure of the microstructured optical fiber that has six air holes in the cladding, it could possess high birefringence that changes with the external force applying to the fiber laterally, based on which a linear relationship between the dynamic force and the propagating mode guided in the fiber could be established. Such vibration sensor exhibits a sensitivity of 25 pm/g to acceleration as well as a broad response frequency range. Its resonant frequency is up to over 2 500 Hz, which is dependent on the mechanical design of the sensor package. A field test was conducted using the proposed vibration sensor, and the sensor could measure the large amplitude vibration in low frequency range, as well as those vibrations in high frequency range, which is helpful to identify the corrugations on the rail. The proposed novel vibration sensor based on six-hole microstructured optical fiber provides a new pathway or approach for monitoring the vibration of structures in railway, bridge and mechanical engineering, showing great potential in the applications. © 2022 Journal of Mechanical Engineering.

引用

页码：63 / 70

页数：7

共 26 条

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