Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Stéphane Rougeault

Pierre Ferdinand

Sylvain Magne

Guillaume Laffont

Laurent Maurin

Véronique Dewynter-Marty

Shamyr Ali Alvarez

Shamir Ali Alvarez

Device for measuring corrosion in a structure. It comprises: at least one assembly comprising a metallic part () intended to be fixed to the structure and able to deform under the effect of corrosion and/or a thermomechanical variation, and transduction means () comprising an optical fibre () fixed to the metallic part in a prestressed state, the transduction means being able to modify light propagating in the fibre under the effect of a stress applied to the fibre; means for measuring and processing the spectral responses supplied by the transduction means of said at least one assembly. The metallic part is segmented longitudinally in order to form an alternation of segments covered by a corrosion-protection material () and uncovered segments, in order to distinguish the thermomechanical influence of the structure from the mechanical effects caused by corrosion.

Device for measuring the corrosion in a metallic structure or a structure comprising at least one metallic reinforcement, associated uses and method

Extensometer with flexible test specimen and Bragg gratings applied in particular to the monitoring of concrete structures, is configured to measure deformations of a host material and comprises at least one test specimen which undergoes linear bending stresses, and at least one Bragg grating formed in an optic fibre and fixed to the test specimen. The extensometer configured such that any deformation of the host material is transmitted to the grating via the test specimen. The extensometer also comprises mechanical means which transform deformation of the material into bending of the test specimen, which deforms the grating.

Extensometer comprising a flexible sensing element and Bragg gratings

An extensometer including a base, a tensioned optical fiber, and a Bragg grating. The extensometer relates particularly to monitoring of structures. Part of the optical fiber containing the Bragg grating is arranged in a tube. This part is tensioned between the two ends of the tube. The ends of this part are fixed to the ends of the tube, and the tube is rigidly fixed to a host material.

Long base, stretched fiber-optic Bragg network extensometer and production method for same

The present invention relates to a planar, rosette-type, optical microsystem with strain gauges having dielectric guides used for measuring a system of strains or stresses applied to a part, in which the part is under purely longitudinal strain, at least one rosette being formed by at least two strain gauges with dielectric guides (J1, J2, J3) and in which a calculating circuit makes it possible to determine said strain by resolving a system of equations.

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Sceaux, France

Stéphane Rougeault