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Sensors 2017, 17(12), 2837; doi:10.3390/s17122837

Two Interrogated FBG Spectral Linewidth for Strain Sensing through Correlation

1
Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
2
School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei 11031, Taiwan
3
Graduate Institute of Translational Medicine, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei 11031, Taiwan
*
Authors to whom correspondence should be addressed.
Received: 6 October 2017 / Revised: 20 November 2017 / Accepted: 1 December 2017 / Published: 7 December 2017
(This article belongs to the Special Issue Optical Fiber Sensors 2017)
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Abstract

The spectral linewidth from two cross-correlated fiber Bragg gratings (FBGs) are interrogated and characterized using a delayed self-homodyne method for fiber strain sensing. This approach employs a common higher frequency resolution instead of wavelength. A sensitivity and resolution of 166 MHz/με and 50 nε were demonstrated from 4 GHz spectral linewidth characterization on the electric spectrum analyzer. A 10 nε higher resolution can be expected through random noise analyses when the spectral linewidth from two FBG correlations is reduced to 1 GHz. Moreover, the FBG spectrum is broadened during strain and experimentally shows a 0.44 pm/με sensitivity, which is mainly caused by the photo elastic effect from the fiber grating period stretch. View Full-Text
Keywords: fiber optics sensors; remote sensing and sensors; fiber Bragg gratings; spectral linewidth; correlation fiber optics sensors; remote sensing and sensors; fiber Bragg gratings; spectral linewidth; correlation
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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

Hsu, S.-H.; Chuang, K.-W.; Chen, C.-S.; Lin, C.-Y.; Chang, C.-C. Two Interrogated FBG Spectral Linewidth for Strain Sensing through Correlation. Sensors 2017, 17, 2837.

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