Advantages of piezocomposites for
Very high sensitivity
The acoustic impedance of piezocomposite
materials can be adjusted from approximately 10 to 15 MRay.
This impedance, much lower than that of ceramics, is closer
to that of water. This results in a better energy transfer
which, combined with high electro-acoustic efficiency, gives
a sensitivity that is 10 to 32dB higher than that obtained
with monolithic piezoelectric ceramics.
Focusing by shaping
The shaping of the active area enables the
beam to be focused without resorting to using a lens that
absorbs some of the energy and only gives an approximate focus
because of the phenomena of aberration.