| Customization: | Available |
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| Type: | High Frequency Ultrasonic Sensor, Ultrasonic Transducer |
| Output Signal Type: | Digital Type, Digital Type |
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20Khz Piezoelectric Transducer Ultrasonic Welding High Power
| Item | Frequency |
Impedance |
Capacitance |
| 5020-4Z | 19.8 | 6 | 11000-12000 |
The use of high-intensity ultrasound in machining is usually based on the application of nonlinear effects created by finite amplitude pressure changes. The most important effects of high-intensity ultrasound are: heat, cavitation, agitation, acoustic flow, interfacial instabilities, and friction, diffusion, and mechanical fracture. These effects can be used to enhance various processes such as machining, welding, metal forming and powder densification in solids; cleaning, emulsification, liquid atomization, accelerated chemical reactions, degassing, defoaming, drying, aerosol agglomeration, etc. .
A certain number of these processes have been introduced in industry, but many of them are still in the laboratory stage and have not yet been commercially developed. This may be due to problems associated with the development of proper ultrasonic power generation technology. In ultrasonic transducers for large applications, the main points to consider are power capacity, efficiency, vibration amplitude and volume to be handled.
Transducers for high-power ultrasound applications are transducers operating in the 10 to 100 kHz range, power capabilities from hundreds of watts to several kilowatts, and large vibration amplitudes.
Transducer material
The more common ultrasonic transducers are of the piezoelectric type. Therefore, we mainly focus our attention on this transducer. However, it is interesting to point out the recent development of new and promising magnetostrictive materials (rare earth compounds) that show great potential for high-power sensors.
Transducers are typically composite devices in which the core is typically a piezoelectric element that changes size in response to an electric field. Other passive components complement the transducer structure to improve energy transfer. These parts are usually made of metal alloys. This section will describe the basic properties of active and passive materials used in high-power transducers, especially piezoelectric ceramics.
The construction of the transducer
The transducers used in modern power ultrasound systems are almost invariably based on prestressed piezoelectric designs. In this configuration, multiple piezoelectric elements (usually two or four) are bolted between a pair of metal end blocks. The piezoelectric element will be a prepolarized lead titanate zirconate composition that exhibits high activity and low loss and aging properties. They are ideal for forming the basis for efficient and robust sensors.
If we consider the length of a polarized piezoelectric rod and drive it with an AC voltage whose frequency corresponds to its resonant length, then this dimension will vary with the applied voltage. Such a rod would have a length of about 70mm at a frequency of 20kHz. Due to the poor heat capacity and low tensile strength of these ceramics, their power handling capabilities will be lower. To overcome these inherent weaknesses, many thin elements are sandwiched between two metal end blocks with low acoustic losses. Titanium or aluminium can be used for this purpose. The assembly should be designed to have a total length of half a wave at the desired operating frequency.
The figure below illustrates a typical transducer structure. In a half-wave resonant assembly, the two piezoelectric elements are located near the point of maximum stress. Because these elements are pre-polarized, they can be arranged such that they are mechanically auxiliary, but electrically opposite. This function places both end blocks at ground potential. Components are clamped together with high-strength bolts to ensure that the ceramic is in compression at maximum sensor displacement.
A transducer constructed in this way can have a potential efficiency of 98% and can handle power transfer of around 500-1000 W when used in continuous operation. When operating at a frequency of 20 kHz, the maximum peak-to-peak displacement of the radiating surface of the transducer is approximately 15-20 microns.
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