Backwall echoes measures have been carried out with two probes and two specimens: the 64 elements linear array at 3 MHz on a rectangular block and the 32 elements linear array on a tube. The reliability of the beam steering laws around L0° and focal laws at different depths have been evaluated by comparison between Kirchhoff and specular models and measurements.
Ø Crystal (mm) | Mode | Frequency (MHz) | Bandwith (%) | Phase (°) |
---|---|---|---|---|
Linear (64 elts) | L0° | 3 | 90 | 310 |
Linear (32 elts) | L0° | 10 | 55 | 290 |
Beam steering laws, -10° to 10°
Focal laws in different points, L0°
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