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Sensors 2017, 17(1), 206; doi:10.3390/s17010206

A Low Frequency FBG Accelerometer with Symmetrical Bended Spring Plates

1
National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, 430070 Wuhan, China
2
Physics Department, Pwani University, P.O. Box 195-80108 Kilifi, Kenya
*
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 14 November 2016 / Revised: 13 January 2017 / Accepted: 16 January 2017 / Published: 22 January 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3526 KB, uploaded 22 January 2017]   |  

Abstract

To meet the requirements for low-frequency vibration monitoring, a new type of FBG (fiber Bragg grating) accelerometer with a bended spring plate is proposed. Two symmetrical bended spring plates are used as elastic elements, which drive the FBG to produce axial strains equal in magnitude but opposite in direction when exciting vibrations exist, leading to doubling the wavelength shift of the FBG. The mechanics model and a numerical method are presented in this paper, with which the influence of the structural parameters on the sensitivity and the eigenfrequency are discussed. The test results show that the sensitivity of the accelerometer is more than 1000 pm/g when the frequency is within the 0.7–20 Hz range. View Full-Text
Keywords: fiber optics sensor; accelerometer; low frequency; vibration monitoring fiber optics sensor; accelerometer; low frequency; vibration monitoring
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Liu, F.; Dai, Y.; Karanja, J.M.; Yang, M. A Low Frequency FBG Accelerometer with Symmetrical Bended Spring Plates. Sensors 2017, 17, 206.

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