Résumé:
The design of 2D arrays for 3D ultrasonic imaging is a major challenge in medical and non-destructive applications. Thousands of transducers are typically needed for beam focusing and steering in 3D volumes. Here, we report a completely new approach for producing 3D images with a small number of transducers using the combined concepts of time reversal mirrors and chaotic reverberating cavities. Due to multiple reverberations inside the cavity, a “kaleidoscopic” transducer array is created with thousands of virtual transducers equivalent to 2D matrices. Beyond the scope of 3D medical imaging, this work leads to the new concept of “smart” transducer.

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