Piezo
Ceramics Tutorial 5 of 15
Dynamic
Performance
Dynamic
performance relates to the behaviour of a material when
subjected to alternating fields or stresses at frequencies
close to the mechanical resonance of a component.
Piezoelectric transducers may be approximately represented
by the equivalent circuit shown in Figure 7. The mechanical
resonance of the device is represented by L1, C1, and R1 .
Since it is a dielectric with electrodes it also has an
electrical capacitance C2.
It is
this parallel combination of C2 with L1, C1, and R1 that
dictates the reactance of the transducer, which varies with
frequency as shown in Figure 8.
The
graph shows the curve decreasing to a minimum impedance, at
a frequency fm followed by a sharp increase to a maximum at
fn These two frequencies are the resonance and
anti-resonance respectively. The performance of a transducer
will have a maximum response at a point which lies between
these points.
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