Views: 0 Author: Site Editor Publish Time: 2022-08-27 Origin: Site
The ultrasonic transducer is an energy conversion device whose function is to convert the electrical input power into mechanical power (e.g., ultrasonic waves) and then emit it while consuming a small part of the power (less than 10%). Therefore, the most important point when using ultrasonic transducers is the coordination with the input and output terminals, followed by the mechanical installation and the appropriate dimensions.
What are the special features of using ultrasonic transducers?
What is the principle of using ultrasonic transducers?
What is the workflow of a medical ultrasonic transducer?
Ultrasonic transducers are mainly used in ultrasonic plastic welding machines, ultrasonic cutting knives, ultrasonic metal welding machines, ultrasonic cleaning machines, sonochemical ultrasonic devices, etc. used.
The ultrasonic transducer can oscillate regularly under excitation by a suitable electric field, its amplitude is generally about 10 µm. Such an amplitude is not sufficient to complete the welding and machining operations directly. After connecting to a reasonably constructed horn, the amplitude of the ultrasonic wave can vary over a wide range and with sufficient material thickness, the amplitude can exceed 100 μm.
The ultrasonic transducer converts the electrical or magnetic energy emitted by the ultrasonic generator into mechanical vibrations of the same frequency. Currently, there are two types of transducers for ultrasonic welding machines. The first is a magnetostrictive converter and the second is a piezoelectric ceramic converter. The first type has low efficiency, low cost performance and requires an external polarized direct current magnetic field, so ultrasonic welding machines are currently rarely used.
Most devices for ultrasonic welding machines now use the second type of piezoelectric ceramic converters. The electrical signal is converted into mechanical vibration by the piezoelectric effect of the material.
The working principle of the medical ultrasonic transducer is basically the same and usually includes an electrical energy storage and a mechanical vibration system inside. When the transducer is used as a transmitter, the electrical vibration signal sent from the excitation current supply causes a change in the electric field or magnetic field in electrical energy storage element in the transducer, and this change has some effect on the mechanical vibration system of the transducer. A driving force is generated to put it into a vibrational state, whereby the medium is brought into contact with the mechanical vibration system of the transducer to vibrate and sound waves are emitted into the medium. The process of receiving sound waves is exactly the opposite. The external sound waves act on the vibration surface of the transducer and thereby cause the mechanical vibration system of the transducer to vibrate. A corresponding change in the magnetic field causes the electrical output of the transducer to generate a voltage and current corresponding to the acoustic signal.
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