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Fibre optic sensor to measure bending

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Publication date 2002-06-28
Patent number 102545
Grant date 2003-09-12
Inventors Luís Ferreira , Francisco Araújo

The present invention refers to a novel configuration for measuring bending in advanced materials (e.g. composite materials). It is based on the intrinsic sensitivity to curvature of fibre Bragg gratings, written in D-type Hi-Bi fibres.

The suggested configuration consists of a pair of D-type FBG sensors that exhibit differential sensitivity to bend and common-mode rejection to temperature and/or axial strain. It can also be used to simultaneously measure curvature, temperature and axial strain.









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