In underwater environment the acoustical wave can transmit a
long ranges away from the transmitter than the electromagnetic wave
does. So far, the piezoelectric ceramic is still the best candidate as
acoustical telemetry transmitters in underwater applications. The
impedance matching on the interface between electro-acoustical transducer
and electrical transmitter has been the most important subject to
confirm the high transmitting efficiency. In this research, a lumped
equivalent circuit of electro-acoustic transducer is proposed. Then,
the network theorem is implemented to design a high power transformer
for impedance matching, and to improve the electro-acoustic
efficiency of the transducer. In the developing procedure, the
transducer’s impedance is measured and the circuit element of equivalent
circuit is deduced from the measured data to correlated the
simulated values of the equivalent circuit. Then the matching transformer
is developed to meet the specifications of impedance matching
and high power operation. The equivalent circuit of the electroacoustic
transducer with matching transformer was developed and
simulated using Hp-Vee program. The simulated results quite agree
with the measured results. This approach really develops an effective
method for impedance matching design and reduced the time for trial
and error.
