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Sensors 2016, 16(3), 277; doi:10.3390/s16030277

An Optical Fiber Displacement Sensor Using RF Interrogation Technique

1
Department of Electrical Engineering and Smart Grid Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Korea
2
Wind Valley Co. Ltd., 4 Yulchonsan-daero, Haeryong-myeon, Suncheon 58025, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 24 November 2015 / Revised: 19 February 2016 / Accepted: 19 February 2016 / Published: 24 February 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2201 KB, uploaded 24 February 2016]   |  

Abstract

We propose a novel non-contact optical fiber displacement sensor. It uses a radio frequency (RF) interrogation technique which is based on bidirectional modulation of a Mach-Zehnder electro-optical modulator (MZ-EOM). The displacement is measured from the free spectral range (FSR) which is determined by the dip frequencies of the modulated MZ-EOM transfer function. In experiments, the proposed sensor showed a sensitivity of 456 kHz/mm or 1.043 kHz/V in a measurement range of 7 mm. The displacement resolution of the proposed sensor depends on the linewidth and the power of the optical source. Resolution better than 0.05 μm would be achieved if an optical source which has a linewidth narrower than 1.5 nm and a received power larger than −36 dBm is used. Also, the multiplexing characteristic of the proposed sensor was experimentally validated. View Full-Text
Keywords: optical fiber displacement sensor; wavelength division multiplexing (WDM); Mach-Zehnder electro-optical modulator (MZ-EOM); radio frequency (RF); free spectral range (FSR) optical fiber displacement sensor; wavelength division multiplexing (WDM); Mach-Zehnder electro-optical modulator (MZ-EOM); radio frequency (RF); free spectral range (FSR)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, H.-H.; Choi, S.-J.; Jeon, K.S.; Pan, J.-K. An Optical Fiber Displacement Sensor Using RF Interrogation Technique. Sensors 2016, 16, 277.

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