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Title: Development and application of an optical fiber sensor based in-place inclinometer for geotechnical monitoring
Authors: Pei, H
Yin, J 
Zhu, H
Hong, C
Keywords: Displacement
Probe instruments
Issue Date: 2011
Source: Geotechnical special publication, 2011, v. , no. 211 GSP, p. 1725-1731 (CD-ROM) How to cite?
Journal: Geotechnical Special Publication 
Abstract: Traditional in-place inclinometers are widely used for displacement monitoring of slopes and other geo-structures. But these inclinometers have limitations such as (a) numerous cables requirement, (b) sensitivity to electromagnetic interference, (c) narrow measuring range. The new optical fiber sensor based in-place inclinometer can overcome the above limitations. This paper introduces a new type of in-place inclinometer based on fiber Bragg grating (FBG) sensing technique. A series of FBG sensors are glued onto the surface of a plastic rod for measuring bending strains and axial strains. Based on the beam theory, these strain results are used to calculate the displacement and rotation angle of the rod tip. A series of rods with FBG sensors can be connected together and installed into a geotechnical structure for displacement monitoring. Several calibration tests have been conducted in laboratory and the calibration results are in good agreement with theoretical results. The new FBG-based in-place inclinometers have been applied in a subway tunnel in Shenzhen, China, and a slope site in Sichuan, China. This technology will be used to monitor a retaining wall in Hong Kong.
Description: Geo-Frontiers 2011: Advances in Geotechnical Engineering, Dallas, TX, 13-16 March 2011
ISBN: 9780784411650
ISSN: 0895-0563
DOI: 10.1061/41165(397)176
Appears in Collections:Conference Paper

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