Commissariat a L'energie Atomique Et Aux Energies Alternatives

Institut De Radioprotection Et De Surete Nucleaire

Commissariat a L'energie Atomique

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissments Michelin

Compagnie Generale Des Etablissements Michelin

Olivier Casula

Jean-Marc Decitre

Sebastien Robert

Claire Prada Julia

Ekaterina Iakovleva

Sebastien Bey

Gérard Cattiaux

Souad Bannouf

Thierry Dardelin

Patrice Alcalde

Arnaud Nadim

Sébastien Robert

Gerard Cattiaux

Sébastien Bey

A method for processing ultrasonic signals includes: controlling a plurality of emission transducers for L successive emissions of ultrasonic waves; controlling N reception transducers to simultaneously receive and for a predetermined time, for each successive emission, N measurement signals; obtaining an array of ultrasonic time signals of size L&#xd7;N, each coefficient K(t) of this array representing the measurement signal received by the j-th reception transducer due to the i-th emission; and denoising the time signal array by removing some of the singular values and associated singular vectors obtained from a singular value decomposition of a frequency signal array obtained by transforming this time signal array, and by reconstructing a denoised time signal array based on unremoved singular values and singular vectors.

Method for processing signals acquired by ultrasonic probing, corresponding program and ultrasonic probing device

A method for reconstructing geometry of an object surface via echographic probing, using an ultrasound probe including plural transducers, the method including: controlling the transducers to transmit towards the surface ultrasound waves having initial transmission delays between them; executing at least once a cycle of operations including receiving from the transducers intermediate measurement signals, correcting transmission delays of the transducers using intermediate measurement signals, and controlling the transducers to transmit towards the surface ultrasound waves having the corrected transmission delays; receiving from the transducers final measurement signals resulting from reflection of a wavefront received simultaneously on the surface; determining specular travel times between each transducer and the surface based on the final measurement signals and the corrected transmission delays; and perform geometric reconstitution of the surface based on the determined specular travel times.

Method for reconstructing the geometry of a surface of an object via echographic probing, corresponding computer program and ultrasound probing device

An ultrasound probing device including: a box; a locating mechanism to provide a position of the box in relation to a reference frame associated with an object to be examined; a mechanism to determine a delay law based on focusing parameters, representing a desired position of a focal point in relation to a reference frame associated with the box; a controller to provide control signals based on the delay law; transducers attached to the box, to receive control signals and, in response, to transmit ultrasonic waves in the object respectively delayed according to the delay law to focus at the focal point defined by the focusing parameters; and a mechanism updating the focusing parameters based on predefined associations between positions on a desired path of the box in relation to the reference frame associated with the object and corresponding focusing parameter values and the position of the box.

Ultrasound probing device, method of controlling transducers of an ultrasound probe and corresponding computer program

A device for detection of at least one defect in a concave or convex structure including an emitting part and a receiving part, in which the emitting part includes at least one current layer that makes it possible to create currents oriented approximately along a same direction as the defects whose influence is to be minimized and the receiving part includes at least one magnetic field receiver, added on or etched on a flexible support.

Device for detection of at least one defect in a concave or convex structure

The device () for checking a tire () reinforcing thread comprises: an induction member () that induces a magnetic flux (P, P; P) in the thread (-), a support () supporting the induction member () having the overall shape of a U and comprising legs () that conduct the magnetic flux (P) into the thread (-), the legs defining a direction of alignment of the device, at least one receiver member () that receives the magnetic flux (P, P; P) flowing through the thread (-) situated between the legs (). The dimensions of the receiver member are designed so as to measure only the magnetic flux flowing through the thread (-) when, in operation, the direction of alignment () is parallel to the thread (-).

Device for monitoring metal wires in a tire

Phased array ultrasonic contact transducer, with a flexible wedge and a profilometer. This transducer applies to the non-destructive monitoring of an object and comprises: a set of elements that are rigidly integral with each other, at least part of the elements serving as ultrasound transmitters, a wedge whereof at least the front face is flexible to be applied against the surface of the object and the rear face of which is made integral with the set of elements, and a profilometer to measure surface variations and supply signals representative thereof to allow the transmitters to create a focused ultrasonic beam whereof the characteristics are controlled in relation to the object.

Phased array ultrasonic contact transducer, with a flexible wedge and a profilometer

Ultrasonic contact transducer with multiple ultrasonic emitting elements and means of bringing these elements into contact. This transducer is applicable particularly to non-destructive testing and comprises means () for bringing elements () into contact with an object () to be checked and means (, andto) of determining the positions of elements relative to the object, using means bringing elements into contact, to determine delay laws to be applied to excitation pulses of the elements, to generate a focussed ultrasonic beam (F).

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Longpont sur Orge, France

Olivier Casula