Sensitive Object

Societe D'elastographie Impulsionnelle Pour Les Systemes De Mesure De L'elasticite (seisme)

Stefan Catheline

Mathias Fink

Nicolas Quieffin

Laurent Sandrin

Ros Kiri Ing

Ros Kiri Kiri Ing

Micha&euml;l Tanter

Apparatus and methods for locating an impact point on a surface of an object. The object is provided with an acoustic sensor that senses the impact from the acoustic waves that are generated when the object is subjected to the impact. The location of the impact on the surface of the object is determined by a recognition step that includes a comparison of the sensed signal to one or more predetermined signals. Each predetermined signal represents an active zone on the surface of the object. A predetermined signal corresponds to the sensed signal when the impact causing the sensed signal is generated in the active zone represented by the predetermined signal. The impact is associated with the active zone represented by a predetermined signal when the sensed signal and the predetermined signal sufficiently correspond to each other.

Method for locating an impact on a surface and device therefor

The invention concerns an image method for observing the propagation of low-frequency shearing pulse wave simultaneously in multiple points of a diffusing viscoelastic medium. The method consists in transmitting at a very high rate ultrasonic compression waves enabling to obtain a succession of images of the medium; then in delayed processing of the resulting images by intercorrelation to determine in each point of each image the movements of the medium while the shearing wave is being propagated.

Imaging method and device using shearing waves

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Montreuil, France

Stefan Catheline