Fiber Bragg grating strain sensor for hard rocks

Alvaro Castro-Caicedo; María Julia Nieto-Callejas; Pedro Torres

doi:10.1117/12.2195030

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28 September 2015 Fiber Bragg grating strain sensor for hard rocks

Alvaro Castro-Caicedo, María Julia Nieto-Callejas, Pedro Torres

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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 963449 (2015) https://doi.org/10.1117/12.2195030
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

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.

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Alvaro Castro-Caicedo, María Julia Nieto-Callejas, and Pedro Torres "Fiber Bragg grating strain sensor for hard rocks", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963449 (28 September 2015); https://doi.org/10.1117/12.2195030

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