UNIAXIAL THERMAL AND/OR MECHANICAL DEFORMATION-MEASURING DEVICE, SYSTEM AND METHOD EMPLOYING A BRAGG GRATING OPTICAL FIBRE

摘要

The invention relates to a uniaxial deformation-measuring device consisting of: a section of optical fibre comprising at least one Bragg grating which is aligned with the direction of the measurement axis; and a test body which is subjected to the deformations to be measured and which transmits same to the section of optical fibre. The inventive device is characterised in that: (i) fixing points, which are designed to subject the fibre section to a negative, positive or zero preload and to transmit the elongations experienced in the test body thereto, are separated by a distance (Lfib) presenting a variation (