Acoustical imaging through a multiple scattering medium using a time-reversal mirror.
Acoustical imaging is based on the ability to focus an acoustic beam inside the zone of interest. This remains an issue through a high-order multiple scattering medium because the electronic delay lines that enable one to focus through a multiple scattering medium are a priori unknown. Using time-reversal principles, we show that images can be obtained through a very disordered medium. Surprisingly, the images are better than those obtained in a homogeneous medium with a classical imaging device.
Roux
P
P
Laboratoire Ondes et Acoustique, Université Paris 7. philippe.roux@espci.fr
Derode
A
A
Peyre
A
A
Tourin
A
A
Fink
M
M
D000162:Acoustics; D019047:Phantoms, Imaging; D013997:Time Factors; D014159:Transducers; D014465:Ultrasonics