Basic principles of piezoelectric ceramic Ultrasonic transducer and resonant frequency interaction are introduced

Piezoelectric ceramic Ultrasonic transducer (pzt) is an electrical, acoustic, and force converter. It is a technical principle that converts electrical and acoustic signals into energy through material properties, the piezoelectric ceramics are polarized in a strong DC electric field in the firing process, and the polarized piezoelectric ceramics will keep enough pressure when the pressure and tension are applied to the piezoelectric ceramic plate, the two ends of the ceramic plate will also produce an opposite polarity of electric charge, through the circuit to create an electric current, such piezoelectric effect poured into the water, under the influence of sound waves at the two ends of the transducer will be induced charge, also sound wave receiver.

The importance of piezoelectric ceramic conversion efficiency

Piezoelectric ceramic Ultrasonic transducer are usually made of two materials, a magnetostrictive metal and a piezoelectric ceramic, which act as a network for energy transmission through piezoelectric ceramic transducers, therefore, the study of the efficiency of energy conversion is of primary concern. In the design of ultrasonic transducers, it is necessary to evaluate the acoustic impedance, resonant frequency, acoustic structure and material performance, make electroacoustic conversion to achieve the highest working efficiency.

A ring-shaped piezoelectric ceramic plate What is the relationship between its thickness and frequency

For the ring-shaped piezoelectric ceramic plate, its frequency is the resonant frequency, the larger the diameter of the ceramic plate, the larger the radial resonant frequency, the thicker the thickness of the ceramic plate, the smaller the radial resonant frequency, the common outer diameter of piezoelectric ceramic can be divided into 15mm/25mm/30mm/45mm/50mm/60mm.

In order to generate and receive ultrasonic waves, a bending vibration ultrasonic sensor is made of a circular piezoelectric ceramic, it uses its own piezoelectricity and piezoelectric effect to create and receive ultrasonic waves.

When a piezoelectric element can be used in acoustics, whether it is transmitting or receiving sound waves, it belongs to a vibrating element, and the two electrodes of the piezoelectric element are loaded with an alternating voltage, which is used as an transmitting sound wave element at the transmitting end, when the frequency of the voltage is consistent with the resonant frequency of a certain vibration mode of the piezoelectric element, it will also produce resonance. Most piezoelectric elements are connected to an electronic circuit, so the equivalent circuit model of piezoelectric element can be used to simulate its electromechanical vibration characteristics.