(1) Working frequency. The working frequency is the resonant frequency of the piezoelectric wafer. When the frequency of AC voltage applied to both ends of the chip is equal to the resonant frequency of the chip, the output energy is the largest and the sensitivity is the highest.
(2) Working temperature. Because the Curie point of piezoelectric materials is generally high, especially the power of ultrasonic probe used for diagnosis is small, so the working temperature is relatively low, and it can work for a long time without failure. Ultrasound sensors for medical use have high temperature and require separate refrigeration equipment.
(3) Sensitivity. It depends mainly on the chip itself. The electromechanical coupling coefficient is large and the sensitivity is high; on the contrary, the sensitivity is low.