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Title: Fiber optic displacement monitoring in laboratory physical model testing
Authors: Zhu, HH
Yin, JH 
Pei, HF
Zhang, L
Zhu, WS
Keywords: Cavern
Fiber Bragg grating (FBG)
Physical model
Issue Date: 2011
Publisher: Scientific.Net
Source: Advanced materials research, 2011, v. 143-144, p. 1081-1085 How to cite?
Journal: Advanced materials research 
Abstract: For physical models, conventional techniques have difficulties in monitoring internal displacements during laboratory testing. In this paper, based on fiber Bragg grating (FBG) sensing technology, a bar-type fiber optic displacement sensor is developed for small-scale models. When the model deforms due to loading or unloading, the embedded displacement sensor can capture the displacement profile along the bar length using the strain data from quasi-distributed FBGs. Laboratory calibration tests have showed that the displacements measured by the FBG sensing bar are in good agreement with those from conventional displacement transducers. For the physical models of a gravity dam and a cavern group, the FBG sensing bars were successfully installed in predefined holes, together with conventional gauges. During testing, the FBG sensing bars measured the displacement distributions within the models. The fiber optic monitoring results demonstrate the deformation characteristics of surrounding rock masses induced by overloading and underground excavation and indicate the overall stability conditions of these two geo-structures.
Description: International Conference on Smart Materials and Intelligent Systems 2010, SMIS 2010, Chongqing, 17-20 December 2010
ISBN: 9780878492237
ISSN: 1022-6680
EISSN: 1662-8985
DOI: 10.4028/
Appears in Collections:Conference Paper

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