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Sensors 2012, 12(4), 4265-4280; doi:10.3390/s120404265

Parametric Study of the Reflective Periodic Grating for In-Plane Displacement Measurement Using Optical Fibers

Department of Aerospace Engineering, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Korea
Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, 172 Gongneung 2-dong, Nowon-gu, Seoul 139-743, Korea
Author to whom correspondence should be addressed.
Received: 18 January 2012 / Revised: 7 March 2012 / Accepted: 26 March 2012 / Published: 28 March 2012
(This article belongs to the Special Issue Optical Fiber Sensors 2012)
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This paper presents a technique for a simple sensing principle that can be used for the measurement of displacement. The proposed sensor head is composed of a reflective grating panel and an optical fiber as a transceiver. The simplified layout contributes to resolving the issues of space restraints during installation and complex cabling problems in transmission fiber optic sensors. In order to verify the effectiveness of the proposed technique, it is important to obtain the sinusoidal signal reflected from the grating for reasonable phase tracking. In the numerical analysis, a real wave based optical beam model is proposed for the extraction of predicted signal according to the grating width and ratio of reflection bar width to spacing. The grating pattern design to obtain a sine wave reflected sensor signal was determined within an R-square value of 0.98 after sine curve fitting analysis. Consequently, the proposed sensor principle achieved the in-plane displacement measurement with a maximum accuracy error of 5.34 µm. View Full-Text
Keywords: optical fiber; sinusoidal signal; one-way displacement; grating pattern optical fiber; sinusoidal signal; one-way displacement; grating pattern

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Lee, Y.-G.; Kim, D.-H.; Kim, C.-G. Parametric Study of the Reflective Periodic Grating for In-Plane Displacement Measurement Using Optical Fibers. Sensors 2012, 12, 4265-4280.

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