Great learning of transducer principle knowledge
1. Introduction to Ultrasonic Transducer
Ultrasonic transducer, the English name is Ultrasonictransducer, is an energy conversion device that converts high-frequency electrical energy into mechanical energy. It is often used in equipment such as ultrasonic cleaning machines, ultrasonic welding machines, trichlorine machines, gas cameras, etc., and has been widely used in agriculture, industry, life, transportation, military, medical and other fields.
2. Ultrasonic transducer structure
Ultrasonic transducers mainly consist of shell, acoustic window (matching layer), piezoelectric ceramic disc transducer, backing, lead-out cable, Cymbal array receiver, etc. Among them, the piezoelectric ceramic disc transducer plays the same role as the general transducer, which is mainly used to transmit and receive ultrasonic waves; and on the piezoelectric ceramic disc transducer is the Cymbal array receiver, which is mainly composed of The lead-out cable, Cymbal transducer, metal ring and rubber gasket are used as an ultrasonic receiver to receive the Doppler return signal generated outside the frequency band of the piezoelectric ceramic disc transducer.
3, the principle of ultrasonic transducer
Ultrasonic transducers are actually piezoelectric ceramics with the same frequency as its resonant frequency, which uses the piezoelectric effect of the material to convert electrical energy into mechanical vibration. Generally, ultrasonic waves are first generated by an ultrasonic generator, which is converted into mechanical vibration by an ultrasonic transducer, and then ultrasonic waves can be generated by an ultrasonic deriving device and an ultrasonic receiving device.
4, ultrasonic transducer application
(1) The ultrasonic cleaning machine uses ultrasonic waves to continuously spread in the cleaning liquid to clean the dirt on the object. The ultrasonic vibration frequency is determined by the ultrasonic transducer, and different frequencies can be set according to the cleaning object to achieve cleaning. the goal of.
(2) Ultrasonic welding machine uses an ultrasonic transducer to generate ultrasonic vibration, and the vibration generates friction to cause the welding area to be partially melted and joined together.
(3) The ultrasonic motor does not contain an ultrasonic transducer, but the stator is approximated as a transducer, and the inverse piezoelectric effect is used to generate ultrasonic vibration. The friction between the stator and the rotor drives the rotor to rotate.
(4) Ultrasonic weight loss uses ultrasonic transducers to generate mechanical vibrations to break fat cells and excrete them out of the body, thereby achieving the effect of weight loss.
