Abstract: A method for focusing acoustic waves on an interface between two layers of a multilayer structure includes providing laser means able to emit a laser beam toward an exterior surface of the multilayer structure to produce a longitudinal wave from the centre of a laser-beam spot projected onto the exterior surface and a transverse wave from the periphery of said spot, determining the distance between said interface and the exterior surface, determining one or more propagation velocities of each of the longitudinal wave and the transverse wave in the one or more layers passed through by said waves to reach said interface, and determining a radius of the laser-beam spot depending on the one or more propagation velocities and on said distance so that the time taken by the longitudinal wave to reach said interface is equal to three times the time taken by the transverse wave to reach said interface.

Abstract: An optical device that is intended for laser treatment of internal surfaces of a covering part of the leading-edge type, including a collimator that is intended to be connected to a laser source via an optical fibre to produce a laser beam having a collimated and flat spatial pulse profile, a cylindrical lens that is configured to focus the laser beam along a spatial line that is transverse to the propagation of the laser beam thus forming a line-laser-beam, a reflecting optical component that is configured to be able to be introduced into the interior of the covering part and to uniformly reflect the line-laser-beam onto at least one internal surface of the covering part and in directions of incidence that are almost normal to at least one internal surface.

Abstract: A method of non-destructively inspecting an adhesively bonded assembly of first, second, and third materials includes generating guided waves in the adhesively bonded assembly and establishing a dispersion curve plot in a first reference frame on the basis of receiving the guided waves. The method further includes comparing the dispersion curve plot with a plurality of reference dispersion curves established in the first reference frame, each of the reference dispersion curves being obtained by generating guided waves in a reference adhesively bonded assembly. Finally, the method includes estimating at least one of the thicknesses of the materials in the adhesively bonded assembly under inspection.

Abstract: A method for nondestructive inspection by ultrasound of a bonded assembly is provided. The method comprises two steps, consisting of measuring a thickness of an adhesive joint of the bonded assembly by an ultrasound transducer arranged on the bonded assembly in a determined position, and measuring the degree of adhesion of parts of the bonded assembly by the same ultrasound transducer maintained in the determined position, the degree of adhesion being measured by ZGV Lamb waves.

Abstract: A characterization device for non-destructively characterizing a material includes emitter/receiver cells, each cell being able, in an emit mode, to emit ultrasound waves towards the material for characterizing, and, in a receive mode, to receive ultrasound waves that have been transmitted through the material. The non-destructive characterization device includes a ring made up of a plurality of adjacent angular sectors, each angular sector including ultrasound cells stacked in a radial direction of the ring.

Abstract: A system for inspecting a structure with coda acoustic waves, via a given surface (S) that is accessible from the exterior of the structure. The system operates to acoustically excite the structure at least one determined excitation point (Pe1) of the given surface (S) with an ultrasonic pulse of determined form, measure vibrations at least three set measurement points (Pmi) on the given surface (S), during a time window set with respect to the ultrasonic pulse, and exploit the vibration measurements in order to define an indication (Pd) in the structure of at least one possible defect using a coda acoustic-wave signal at each of the measurement points (Pmi).

Abstract: A method of non-destructively inspecting an adhesively bonded assembly of first, second, and third materials includes generating guided waves in the adhesively bonded assembly and establishing a dispersion curve plot in a first reference frame on the basis of receiving the guided waves. The method further includes comparing the dispersion curve plot with a plurality of reference dispersion curves established in the first reference frame, each of the reference dispersion curves being obtained by generating guided waves in a reference adhesively bonded assembly. Finally, the method includes estimating at least one of the thicknesses of the materials in the adhesively bonded assembly under inspection.

Abstract: A characterization device for non-destructively characterizing a material includes emitter/receiver cells, each cell being able, in an emit mode, to emit ultrasound waves towards the material for characterizing, and, in a receive mode, to receive ultrasound waves that have been transmitted through the material. The non-destructive characterization device includes a ring made up of a plurality of adjacent angular sectors, each angular sector including ultrasound cells stacked in a radial direction of the ring.

Abstract: An optical device that is intended for laser treatment of internal surfaces of a covering part of the leading-edge type, including a collimator that is intended to be connected to a laser source via an optical fibre to produce a laser beam having a collimated and flat spatial pulse profile, a cylindrical lens that is configured to focus the laser beam along a spatial line that is transverse to the propagation of the laser beam thus forming a line-laser-beam, a reflecting optical component that is configured to be able to be introduced into the interior of the covering part and to uniformly reflect the line-laser-beam onto at least one internal surface of the covering part and in directions of incidence that are almost normal to at least one internal surface.

Abstract: A method for nondestructive inspection by ultrasound of a bonded assembly is provided. The method comprises two steps, consisting of measuring a thickness of an adhesive joint of the bonded assembly by an ultrasound transducer arranged on the bonded assembly in a determined position, and measuring the degree of adhesion of parts of the bonded assembly by the same ultrasound transducer maintained in the determined position, the degree of adhesion being measured by ZGV Lamb waves.

Abstract: A system for inspecting a structure with coda acoustic waves, via a given surface (S) that is accessible from the exterior of the structure. The system operates to acoustically excite the structure at at least one determined excitation point (Pe1) of the given surface (S) with an ultrasonic pulse of determined form, measure vibrations at at least three set measurement points (Pmi) on the given surface (S), during a time window set with respect to the ultrasonic pulse, and exploit the vibration measurements in order to define an indication (Pd) in the structure of at least one possible defect using a coda acoustic-wave signal at each of the measurement points (Pmi).