Centre National De La Recherche Scientifique

Université Du Mans

Institut De Recherche Technologique Jules Verne

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

Julien Poittevin

Pascal Picart

Kevin Heggarty

Julien Le Meur

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.

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La Milesse, France

Julien Poittevin