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. 2017 Feb 24;17(3):452. doi: 10.3390/s17030452

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Schematic illustration of typical structures of FBG-based inclinometers. (a) FBG borehole inclinometer [47]; (b) FBG segmented deflectometer [16]; (c) FBG in-place inclinometer [15]; (d) New-generation FBG in-place inclinometer [45].

Schematic illustration of typical structures of FBG-based inclinometers. (a) FBG borehole inclinometer [47]; (b) FBG segmented deflectometer [16]; (c) FBG in-place inclinometer [15]; (d) New-generation FBG in-place inclinometer [45].