The impact of prestressing on transducers
The impedance and frequency of piezoceramics stabilize as preload increases. Higher preload can reduce the impedance of the transducer. If the piezoceramic is not adequately clamped, the transducer impedance will increase.
Is it true that the prestress of the transducer should be as high as possible?
Excessive prestress can reduce the performance of the transducer, mainly reflected in the following aspects:
The performance of piezoceramics changes under compressive bias. Specifically, the highest safe operating temperature for the material may significantly decrease, and high compressive stress may lower the Curie temperature.
Excessive preload can lead to significant depolarization, while also causing unstable impedance and aging.
Excessive prestress can reduce the lifespan of the transducer, and in severe cases, it may cause cracking of the ceramic plates in the transducer.
Initially, excessive prestress in the transducer may result in lower impedance, but over time, the performance of the transducer deteriorates, accompanied by products exhibiting high impedance
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