Centre National De La Recherche Scientifique

Université Du Mans

Office National D'etudes Et De Recherches Aerospatiales

Institut De Recherche Technologique Jules Verne

Institut Mines Telecom-Imt Atlantique-Bretagne-Pays De La Loire

Universite Du Maine, Institut Des Molecules Et Materiaux Du Mans (Immm-Umr 6283)

Pascal Picart

Kevin Heggarty

Julien Poittevin

Julien Le Meur

Mokrane Malek

Bruno Fleury

Matthieu Piniard

Béatrice Sorrente

A device for manufacturing a piece with addition of material includes an optical inspection unit for capturing at least one holographic image of a transformation zone of the material, in real time while the piece is being manufactured. A processor then characterizes a topography of the transformation zone from each holographic image. Such manufacturing device may be in particular of 3D-printer type, or a welding device.

Inspection device for manufacturing a part with addition of material

Some embodiments are directed to a system for measuring vibrations of a surface of a mechanical part, by digital holography. The system includes a source of radiation emitting in a predetermined range of frequencies, a first separator element configured to define a first incident ray and a reference ray, a module for shaping a second incident ray from the first incident ray, and an optical element configured to make the reference ray and a radiation produced by a reflection of the incident ray on the surface of the mechanical part interfere. The module for shaping the second incident ray includes diffracting optical elements having a diffraction structure to diffract the incident radiation. The structure is from a polymer, sol-gel or photoresin material resting against a glass substrate, the structure including elements etched in a plane parallel and/or orthogonal to the substrate, with dimensions from 100 nanometres to 100 micrometres.

Projection system for measuring vibrations

A system for recording a digital hologram of an object comprises: a coherent source intended to illuminate the object and thus produce a wave diffracted by the object; and a digital sensor intended to record the digital hologram of the object. It furthermore comprises a spatial phase modulating assembly able to produce in the plane of the sensor a plurality of duplicates of the wave diffracted by the object, the duplicates being offset from each other but overlapping partially, these duplicates forming on the sensor a digital hologram of the object, this hologram being what is referred to as a self-reference hologram.

Self-reference holographic imaging system

Growing community of inventors

Le Mans, France

Pascal Picart