Table I.
Properties of Panametrics ultrasonic transducers used.
| Model Number | Center Frequency (MHz) | Diameter (inches) | Focal Length (inches) |
|---|---|---|---|
| V391 | 0.5 | 1.125 | 2.1 |
| V302 | 1.0 | 1.0 | 2.0 |
| V305 | 2.25 | 0.75 | 1.5 |
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