Working Principle Of Ultrasonic Transducer

An ultrasonic transducer is a piezoelectric ceramic that resonates at ultrasonic frequencies. The piezoelectric effect of the material converts electrical signals into mechanical vibrations. The working principles of medical ultrasonic transducers (ultrasonic probes) are generally the same. They usually contain an electrical energy storage element and a mechanical vibration system. When the transducer is used as a transmitter, the electrical oscillation signal sent from the excitation power supply will cause changes in the electric field or magnetic field in the electrical energy storage element of the transducer. This change generates a driving force on the mechanical vibration system of the transducer through a certain effect, causing it to enter a vibrating state, thereby driving the medium in contact with the mechanical vibration system of the transducer to vibrate and radiate sound waves into the medium. The process of receiving sound waves is exactly the opposite. External sound waves act on the vibration surface of the transducer, causing the mechanical vibration system of the transducer to vibrate. With the help of some physical effect, the electric field or magnetic field in the energy storage element of the transducer changes accordingly, causing the electrical output end of the transducer to generate a voltage and current corresponding to the sound signal.