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(a) Solid TRC, (b) water TRC, and (c) tunable TRC. From left to right: Concept scheme of the TRC, a typical signal obtained by a FDTD simulation. Below (c): Our experimental realization in 2 configurations A and B (see further).
(a) Theoretical scattering cross section and mean cosine of a 0.8 mm diameter steel rod. (b) FDTD simulation. A linear probe is simulated to focus at 3 cm through the rods. Effect of the density of rods on the pressure value using classic TR and the 1-bit TR deducted value using the theoretical gain.
Effect of the width of the scattering medium in the configurations (A) and (B) for several angulations of the probe.
(a) Beamsteering diagram in configuration A. (b) Shock wave obtained with the optimal TRC at maximum output voltage (P+ = 23.3 MPa, P− = −9.0 MPa).
Normalized pressure at the focus obtained in FDTD simulations (same transmitted acoustic intensity for each configuration). Left column: time-reversal; right column: 1-bit TR.
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