FIG. 3.

Verification of the AF in fabricated transducers. (a) HF pulse–echo response without the AF layer, showing a series of aliasing echoes. (b) With the AF layer included, the aliasing echoes are eliminated. (c) Pressure amplitude measured from transducer A (traditional matched) and transducer C (AF enhanced) normalized to transducer O (without matching layers). (d) Actual gain of the AF on transmission and the output amplitude gain considering the reflection from the rear surface (calculated and measured).