US 2020/0089164 A1Published application

Projection system for measuring vibrations

AssigneesUniversite Du Mans, Centre National De La Recherche Scientifique, Institut Mines Telecom—Imt Atlantique—Bretagne—Pays De La Loire, Institut De Recherche Technologique Jules Verne

InventorsJulien POITTEVIN, Pascal PICART, Kevin HEGGARTY, Julien LE MEUR

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Abstract

A system for measuring vibrations of a surface (VSURF) of a mechanical part (M), comprising a source (SOURCE) of radiation (L), a first separator element (ELI) configured to define a first incident ray (LB1) and a reference ray (RLB), a shaping module (DOEM) producing a second incident ray (LB2) from said first incident ray (LB1), and an optical element (OE) capable of an interferential addition of the reference ray (RLB) and a ray produced by a reflection of said second incident ray (LB2) on said surface (VSURF), the shaping module (DOEM) comprising one or more diffracting optical elements (DOE1, . . . , DOEn), each comprising at least one diffraction structure (FSTRUCT) diffracting all or part of the first incident ray (LB1) so as to illuminate a chosen surface of the mechanical part.

Claims2

Dependent claims

System (SYS) for measuring vibrations of a surface (VSURF) of a mechanical part (M), by digital holography, said system comprising:

a source (SOURCE) of radiation (L) emitting in a predetermined range (LF) of frequencies,
a first separator element (EL1) configured to define a first incident ray (LB1) and a reference ray (RLB),
a module (DOEM) for shaping a second incident ray (LB2) from said first incident ray (LB1), and
an optical element (OE) configured to make said reference ray (RLB) and a radiation (LB2′) produced by a reflection of said incident ray (LB2) on said surface (VSURF) of said mechanical part (M) interfere,
said module (DOEM) for shaping said second incident ray (LB2) comprises one or more diffracting optical elements (DOE1, . . . , DOEn), each comprising at least one diffraction structure (FSTRUCT) configured to diffract all or part of said incident radiation (LB1),
said system being characterised in that said at least one diffraction structure is produced from a polymer, sol-gel or photoresin material resting against a glass substrate, said structure comprising elements etched in a plane parallel and/or orthogonal to said glass substrate, with dimensions ranging from 100 nanometres to 100 micrometres.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/496,889Filed 19 Mar 2018
Priority: FR 170031624 Mar 2017
Published: 19 Mar 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

G03H 1/0005
Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them;…
G01H 9/00
Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive
G01H 9/002
Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means: for representing…
G03H 1/0402
Processes or apparatus for producing holograms: recording geometries or arrangements