When the piezoelectric crystal is placed in an external electric field, the center of gravity of the positive and negative charges in the crystal moves under the action of the electric field, and this polarization displacement leads to the deformation of the crystal, which is called the inverse piezoelectric effect.
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Ultrasonic transducers are widely used, including industry, agriculture, transportation, life, medical treatment and military affairs. According to the realized functions, it can be divided into ultrasonic machining, ultrasonic cleaning, ultrasonic detection, detection, monitoring, telemetry and remote control. According to the working environment, it is divided into liquid, gas and organism. According to the nature, it can be divided into power ultrasound, detection ultrasound and ultrasonic imaging.
The mechanism of ultrasonic cleaning is to use the physical effects such as cavitation, radiation pressure and acoustic flow generated when ultrasonic waves propagate in cleaning solution to peel off the machinery generated by dirt on the cleaned parts, and at the same time, it can promote the chemical reaction between cleaning solution and dirt to achieve the purpose of cleaning objects. The frequency of ultrasonic cleaning machine can be 10 ~ 500 kHz, generally 20 ~ 50 kHz according to the size and purpose of the cleaning object.