Method And Device For Mapping Fibrous Media

摘要

A method for mapping fibrous media by propagation of ultrasound from a set transducers, wherein: a number of unfocused incident ultrasonic waves having different wavefronts are emitted; the signals reverberated by the medium toward each transducer are captured; coherent signals respectively corresponding, for each transducer, to contributions coming from different fictitious focal points in the medium are determined; and then the orientation of the fibers is determined by comparing a spatial coherence between said coherent signals, in a plurality of directions.

主权项

1. A method for mapping fibrous media, comprising:
a measurement step during which a set of transducers Tij emits, in a field of view of a medium comprising fibers, a number N of unfocused incident ultrasonic waves l having different wavefronts, and respective signals RFrawl,ij representative of ultrasonic waves reverberated by the medium are captured by the transducers Tij from the incident waves l, a step of synthesizing, coherent data during which are determined, from N sets of captured signals RFrawl,ij, for a number M of fictitious focal points Pk in the field of view, coherent signals RFcoherentk,ij corresponding to the signals that would have been received by the transducers Tij if a wave focused at point Pk had been emitted by said transducers, a step of mapping fibers of the medium, during which the presence and orientation of fibers at each point Pk are determined by comparing a spatial coherence between coherent signals RFcoherentk,ij in a plurality of directions.