UT - Geometrical echoes: Backwall echoes

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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