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Sensors 2017, 17(5), 1016; doi:10.3390/s17051016

A New Measurement Approach for Small Deformations of Soil Specimens Using Fiber Bragg Grating Sensors

School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, 1037 Luoyu Rd., Wuhan 430074, China
Academic Editors: George Rodriguez, Joseba Zubia and Paulo S. André
Received: 23 March 2017 / Revised: 18 April 2017 / Accepted: 29 April 2017 / Published: 4 May 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
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Abstract

A measurement approach for small deformations of soil specimens has been proposed in this study. The proposed approach consists of a small deformation transducer (SDT) based on fiber Bragg grating sensors which could provide an alternative tool to measure local small deformations of a soil specimen with high accuracy. The working principle, design procedures, calibrations and applications of the SDT are presented. An analytical solution is derived to obtain the relationship between the small deformation of the transducer and the wavelength shift of the FBG sensor, which was further evident in the laboratory calibration tests. The measurement range and resolution of the SDT can be adjusted by choosing different length and thickness of the material. The SDT can achieve a strain resolution of 4.45 micro-strains for a soil specimen with 80 mm in height. Measurement errors and stability were also examined and the results show that the maximum measurement error was around 0.01 mm. The designed SDT was further installed in a modified triaxial apparatus. Three shearing tests under different confining pressures were conducted. Results measured by the newly developed SDT are analyzed with comparisons to the results using external linear variable differential transformer (LVDT) transducers. The results provide evidence that this measurement approach is suitable for measuring the local deformations of soil specimens with high accuracy and stability. View Full-Text
Keywords: small deformation transducer; fiber Bragg grating (FBG); soil specimen; triaxial test small deformation transducer; fiber Bragg grating (FBG); soil specimen; triaxial test
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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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Xu, D.-S. A New Measurement Approach for Small Deformations of Soil Specimens Using Fiber Bragg Grating Sensors. Sensors 2017, 17, 1016.

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