Packaging and testing of fiber Bragg gratings for use as strain sensor for rock specimens

Castro-Caicedo, Alvaro Jesús and Laín Huerta, Ricardo (2013). Packaging and testing of fiber Bragg gratings for use as strain sensor for rock specimens. "PROCEEDINGS OF SPIE, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications Manuel Filipe P. C. Martins Costa Editor 22?26 July 2013 Porto, Portugal", v. 8785 ; pp.. ISSN 0277-786X. https://doi.org/10.1117/12.2025678.

Description

Title: Packaging and testing of fiber Bragg gratings for use as strain sensor for rock specimens
Author/s:
  • Castro-Caicedo, Alvaro Jesús
  • Laín Huerta, Ricardo
Item Type: Article
Título de Revista/Publicación: PROCEEDINGS OF SPIE, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications Manuel Filipe P. C. Martins Costa Editor 22?26 July 2013 Porto, Portugal
Date: July 2013
ISSN: 0277-786X
Volume: 8785
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Explotación de Recursos Minerales y Obras Subterráneas [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This paper reports a packaging and calibration procedure for surface mounting of fiber Bragg grating (FBG) sensors to measure strain in rocks. The packaging of FBG sensors is performed with glass fiber and polyester resin, and then subjected to tensile loads in order to obtain strength and deformability parameters, necessaries to assess the mechanical performance of the sensor packaging. For a specific package, an optimal curing condition has been found, showing good repeatability and adaptability for non-planar surfaces, such as occurs in rock engineering. The successfully packaged sensors and electrical strain gages were attached to standard rock specimens of gabbro. Longitudinal and transversal strains under compression loads were measured with both techniques, showing that response of FBG sensors is linear and reliable. An analytical model is used to characterize the influences of rock substrate and FBG packaging in strain transmission. As a result, we obtained a sensor packaging for non-planar and complex natural material under acceptable sensitivity suitable for very small strains as occurs in hard rocks.

More information

Item ID: 22354
DC Identifier: http://oa.upm.es/22354/
OAI Identifier: oai:oa.upm.es:22354
DOI: 10.1117/12.2025678
Official URL: https://spie.org/x1848.xml
Deposited by: Memoria Investigacion
Deposited on: 14 Feb 2014 10:32
Last Modified: 21 Apr 2016 14:15
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