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 (°) |
---|---|---|---|---|
6.35 | L0° | 2.25 | 64 | 340 |
19 | L0° | 2 | 60 | 0 |
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.
6.35 mm transducer, 2 MHz, L0°
Linear array, 3 MHz, null delay laws
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