Long range extensometer for civil structure monitoring using fibre Bragg gratings

Gnewuch, H., Smeu, E., Jackson, David A., Podoleanu, Adrian G.H. (2005) Long range extensometer for civil structure monitoring using fibre Bragg gratings. Measurement Science & Technology, 16 (10). pp. 2005-2010. ISSN 0957-0233. (doi:10.1088/0957-0233/16/10/016) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1088/0957-0233/16/10/016

Abstract

We report on an extensometer based on fibre Bragg gratings (FBG) which offers a relatively large and high dynamic range for the monitoring of the relative displacement between two adjacent buildings with individual foundations located in an earthquake-prone area. The sensor consists of a sensing FBG subjected to strain and a reference FBG. The fibre containing the strain-sensing FBG is directly surface mounted onto the walls of both buildings, with the fixations ?1 m apart. A large range of ±20 mm is achieved by desensitization through a tilt of the fibre axis with respect to the displacement vector (?6° away from the normal). The sensor is illuminated by a broadband source (SLD with ?0 ? 815 nm) and the reflected signal is monitored directly by a CCD-based optical spectrum analyser. The recorded spectra are curve-fitted to two Gaussian distribution functions on a PC. A precision of 36 ?m displacement with an integration time of 3 ms has been achieved

Item Type: Article
DOI/Identification number: 10.1088/0957-0233/16/10/016
Additional information: This is available as OPEN ACCESS by clicking on the URL.
Uncontrolled keywords: Civil structure monitoring, Displacement, Extensometer, Fibre Bragg grating, Strain, Diffraction gratings, Dilatometers, Functions, Spectrum analysis, Structures (built objects), Vectors, Civil structure monitoring, Displacement, Fiber bragg gratings (FBG), Monitoring, measurement method
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General) > TA1520 Optical Engineering
Divisions: Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Depositing User: Giles Tarver
Date Deposited: 24 Jul 2015 15:18 UTC
Last Modified: 29 May 2019 14:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49766 (The current URI for this page, for reference purposes)
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