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Open AccessArticle

Pendulum-Type Hetero-Core Fiber Optic Accelerometer for Low-Frequency Vibration Monitoring

1
Department of Information Systems Science, Faculty of Science and Engineering, Soka University, 1-236 Tangi-machi, Hachioji, Tokyo 192-8577, Japan
2
Department of Science and Engineering for Sustainable Innovation, Faculty of Science and Engineering, Soka University, 1-236 Tangi-machi, Hachioji, Tokyo 192-8577, Japan
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(8), 2528; https://doi.org/10.3390/s18082528
Received: 20 June 2018 / Revised: 28 July 2018 / Accepted: 31 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Optical Waveguide Based Sensors)
In this paper, a novel pendulum-type accelerometer based on hetero-core fiber optics has been proposed for structural health monitoring targeting large-scale civil infrastructures. Vibration measurement is a non-destructive method for diagnosing the failure of structures by assessing natural frequencies and other vibration patterns. The hetero-core fiber optic sensor utilized in the proposed accelerometer can serve as a displacement sensor with robustness to temperature changes, in addition to immunity to electromagnetic interference and chemical corrosions. Thus, the hetero-core sensor inside the accelerometer measures applied acceleration by detecting the rotation of an internal pendulum. A series of experiments showed that the hetero-core fiber sensor linearly responded to the rotation angle of the pendulum ranging within (−6°, 4°), and furthermore the proposed accelerometer could reproduce the waveform of input vibration in a frequency band of several Hz order. View Full-Text
Keywords: structural health monitoring; fiber optic sensor; accelerometer; hetero-core; low-frequency vibration measurement structural health monitoring; fiber optic sensor; accelerometer; hetero-core; low-frequency vibration measurement
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MDPI and ACS Style

Yamazaki, H.; Kurose, I.; Nishiyama, M.; Watanabe, K. Pendulum-Type Hetero-Core Fiber Optic Accelerometer for Low-Frequency Vibration Monitoring. Sensors 2018, 18, 2528.

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