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Proceedings Paper

Fiber Bragg grating strain sensor for hard rocks
Author(s): Alvaro Castro-Caicedo; María Julia Nieto-Callejas; Pedro Torres
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Paper Abstract

Strain is an important property to be measured in rock structures such as tunnels, slopes, dams, and mining. However, commercial surface mountable fiber Bragg grating (FBG) strain sensors are packaged in planar configuration, which is not appropriate for the irregular surface of the rocks since an unacceptable bonding layer fails to transfer the strain from the rock to the FBG. As a first approach to this problem, in this work we analyze packaged FBG sensors for cylindrical samples of hard rocks. A calibration process was carried out to evaluate the performance of the packaging and bonding layer as compared to electrical resistance strain gage methods. We show the importance of both packaging and bonding layer in FBG sensor technology for measuring strain in hard rocks.

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963449 (28 September 2015); doi: 10.1117/12.2195030
Show Author Affiliations
Alvaro Castro-Caicedo, Univ. Nacional de Colombia - Medellín (Colombia)
María Julia Nieto-Callejas, Univ. Nacional de Colombia - Medellín (Colombia)
Pedro Torres, Univ. Nacional de Colombia - Medellín (Colombia)

Published in SPIE Proceedings Vol. 9634:
24th International Conference on Optical Fibre Sensors
Hypolito José Kalinowski; José Luís Fabris; Wojtek J. Bock, Editor(s)

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