Advanced Ceramics Around You: Piezoelectric Ceramics and Ultrasonic Transducers
Piezoelectric ceramics is a polycrystalline material manufactured by artificial roasting and can be used in many fields. It is an information functional ceramic material that can convert mechanical energy and electrical energy into each other. Through the action of an external electric field and external pressure, the external elastic deformation of the material and the internal electrical polarization are converted into each other, which is called the electrostrictive effect. The sintered ferroelectric is subjected to the polarization treatment of the electric field, so that the disordered internal polarization phenomenon becomes regular and orderly, resulting in piezoelectric properties.
What is the piezoelectric effect?
Piezoelectric effect, in addition to piezoelectricity, piezoelectric ceramics also have dielectric properties, elasticity, etc., and have been widely used in medical imaging, acoustic sensors, acoustic transducers, ultrasonic motors, etc. Piezoelectric ceramics are made by using the material under the action of mechanical stress to cause the relative displacement of the internal positive and negative charge centers to cause polarization, resulting in the appearance of bound charges with opposite signs on the surfaces of the two ends of the material, that is, the piezoelectric effect, and has sensitive characteristics.
What is an ultrasonic transducer?
The function of the ultrasonic transducer is to convert the input electrical power into mechanical power (ie, ultrasonic waves) and then transmit it out, while consuming a small part of the power itself.
An ultrasonic transducer, comprising a casing (1), a matching layer, namely an acoustic window (2), a piezoelectric ceramic disc transducer (3), a backing (4), and an outgoing cable (5), characterized in that it further comprises Cymbal array receiver, which consists of outgoing cables (6), 8 to 16 Cymbal transducers (7), metal rings (8), (9) and rubber gaskets (10); the Cymbal array receiver is located on the disk Above the piezoelectric transducer 3; the piezoelectric ceramic disc transducer is used as the basic ultrasonic transducer, which transmits and receives ultrasonic signals; the Cymbal array receiver is located on the disc piezoelectric transducer, As an ultrasonic receiver, it is used to receive Doppler echo signals outside the frequency band of the disc transducer. Mainly used in ultrasonic plastic welding machine, ultrasonic metal welding machine, ultrasonic cleaning machine, gas camera, triclosan machine, etc.
Application of ultrasonic transducer?
Ultrasonic transducers are widely used, and they are divided into industry, agriculture, transportation, life, medical care and military according to the application industries. According to the realized functions, it is divided into ultrasonic processing, ultrasonic cleaning, ultrasonic detection, detection, monitoring, telemetry, remote control, etc.; according to the working environment, it is divided into liquid, gas, living body, etc.; according to the nature, it is divided into power ultrasonic, detection ultrasonic, ultrasonic imaging, etc.
Other applications of piezoelectric ceramics?
Piezoelectric ceramics are mainly used in the manufacture of ultrasonic transducers, underwater acoustic transducers, electroacoustic transducers, ceramic filters, ceramic transformers, ceramic frequency discriminators, high voltage generators, infrared detectors, surface acoustic wave devices, electro-optical In addition to being used in high-tech fields, devices, ignition and piezoelectric gyroscopes are more used in daily life to serve people and strive to create a better life for people.
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