Abstract: An optical fibre transducer is sensitive to at least one parameter of an environment in which it is located, the modification of the parameter(s) resulting in a modification of at least one measurable characteristic of a light wave injected into the optical fibre and flowing through the transducer, the optical fibre being multimodal and including an element adapted so that the modification of the light wave characteristic is based on a modification of mode coupling resulting from the modification of the environment parameter, the element leading to a mode coupling modification that generates, during the modification, a deformation of the optical fibre in the transducer according to a predetermined pattern. The element leading to the mode coupling modification is a hollow tube containing a relief pattern and surrounding the optical fibre at the transducer in a straight part of the fibre.

Abstract: An optical computerized method and system for the 3D measurement of the external surface of an object in relief by projection of fringes onto the object and use of a phase-shifting method, wherein four projection axes of the fringes onto the object are implemented, the origin of each projection axis being considered as an illumination point located substantially at each of the four vertices of a virtual tetrahedron, the object being placed substantially at the centre of the tetrahedron, and the shootings are taken from four shooting points located substantially along four shooting axes, each of the shooting axes being the median of one of the four trihedrons formed by the four triplets of projection axes, the four shooting points being located at such a distance from the object that, at each shooting point, each image includes at least one portion of each of the three surfaces of the object that can be lighted by the three illumination points of the triplet of projection axes, the median of which defines the