The surface and several backwall echoes have been evaluated for 2 single element probes, of 6.35 mm and 19 mm diameter, and for a linear phased array probe.
|Ø Crystal (mm)||Mode||Frequency (MHz)||Bandwith (%)||Phase (°)|
|Linear(64 elts)||L, 0° to 2°||3||90||310|
Two rectangular blocks of 5 mm and 20 mm thickness have been used in the study of multiple backwall echoes. Measurements and simulations have been carried out with 20 mm and 100 mm water path for a single element probe, 25 mm and 50 mm water path for a tilted phased-array probe from 0° to 2°. The probe aperture, the water path, the incidence angle and the specimen thickness are also varied.
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