An article takes you to read the composition, principle and application of ultrasonic transducer

Ultrasonic transducer, the English name is Ultrasonic transducer, is a kind of energy conversion device that converts high frequency electrical energy into mechanical energy. Mainly used in ultrasonic cutting equipment, ultrasonic atomization spraying equipment, ultrasonic metal melt processing equipment, ultrasonic welding equipment, ultrasonic liquid treatment of acoustic chemical equipment and ultrasonic metal fatigue experimental equipment, the frequency of the transducer usually ranges from 20KHz to 120KHz.

Ultrasonic transducer composition.

Ultrasonic transducer consists of shell, sound window matching layer, piezoelectric ceramic disc transducer, backing, lead-in cable and Cymbal array receiver. The piezoelectric ceramic disc transducer is made of PZT-5 piezoelectric material polarized in the thickness direction, and the Cymbal array receiver is composed of 8 to 16 Cymbal transducers, two metal rings and rubber gaskets. And according to different designs of ultrasonic transducer form mainly: column type (NTK type), inverted horn type (Pitney Bowes type), steel back cover type, middle sandwich aluminum sheet type.

Ultrasonic transducer working principle.

Ultrasonic transducer is a sensor developed using the characteristics of ultrasound. Ultrasonic wave is a vibration frequency higher than the sound waves of mechanical waves, and ultrasonic transducer generally has magnetostrictive and piezoelectric ceramic two forms.

Piezoelectric ceramic ultrasonic transducer working principle: piezoelectric technology uses a crystal with special electrical properties made of lead zirconate titanate. In the transducer, this crystal material has two wires attached on opposite sides. The crystal and the wires are then assembled in a housing between two metal plates. When current flows through the wires and into the crystal, the crystal rapidly changes shape and expands. When the current is terminated, the crystal returns to its original shape. An ultrasonic transducer using this technique rapidly circulates the current through the crystal at a set frequency to produce a resonant effect.

How magnetostrictive ultrasonic transducers work: Fe-rich metals expand and contract when subjected to a magnetic field. To take advantage of this behavior, an iron-rich metal core is wrapped in a copper wire. The assembly is then contained in a canister. When an electric current passes through the copper wire, the metal core expands and lengthens. Like a piezoelectric transducer, the current at a set frequency produces a resonant effect.

Ultrasonic cleaning machine working principle
Ultrasonic cleaning machine working principle

Applications of ultrasonic transducer.

According to the application of the industry is divided into industry, agriculture, transportation, life, medical and military, etc.

According to the realization of the function is divided into ultrasonic processing, ultrasonic cleaning, ultrasonic detection, detection, monitoring, telemetry, remote control, etc.;

According to the working environment is divided into liquid, gas, living organisms, etc.;

By nature, it is divided into power ultrasonic, detection ultrasonic, ultrasonic imaging, etc.

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