PROCEDE DE CARACTERISATION NON DESTRUCTIF ET SANS CONTACT D'UNE STRUCTURE MULTI-COUCHE SENSIBLEMENT SPHERIQUE ET DISPOSITIF ASSOCIE

摘要

A method is provided for the non-destructive and contactless characterization of a multilayered structure having a substantially spherical shape and including at least two layers, separated by interfaces. The method includes using a laser for locally heating the structure in a thermoelastic state so that the structure is vibrated in a non-destructive manner, measuring the resonance frequencies of the vibration modes of the structure and deriving at least one characteristic concerning the integrity or the shape or the mechanical behavior of the structure from the resonance frequencies of the structure.