EnglishViews: 14 Author: Site Editor Publish Time: 2020-10-10 Origin: Site
Ultrasonic transducers are widely used. According to the industry, they are divided into the industry, agriculture, transportation, life, medical treatment, and military. 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, biological body, etc. According to nature, it is divided into power ultrasound, detection ultrasound, ultrasound imaging, etc.
The piezoelectric ceramic transformer uses the piezoelectric effect of the polarized piezoelectric body to achieve voltage output. The input part is driven by a sinusoidal voltage signal and vibrates through the inverse piezoelectric effect. The vibration wave is mechanically coupled to the output part through the input and output parts, and the output part generates an electric charge through the positive piezoelectric effect to realize the two transformations of electrical energy-mechanical energy-electrical energy of the piezoelectric body and obtain the highest value at the resonance frequency of the piezoelectric transformer The output voltage. Compared with the electromagnetic transformer, this has the advantages of small size, lightweight, high power density, high efficiency, breakdown resistance, high-temperature resistance, no fear of burning, no electromagnetic interference and electromagnetic noise, and simple structure, easy production, and easy mass production. In some areas, it has become an ideal substitute for electromagnetic transformers. This type of transformer is used in switching converters, notebook computers, neon lamp drivers, etc.
Ultrasonic motors use the stator as a transducer, use the inverse piezoelectric effect of piezoelectric crystals to make the motor stator vibrate at an ultrasonic frequency, and then rely on the friction between the stator and the rotor to transfer energy and drive the rotor to rotate. Ultrasonic motors have a small size, large torque, high resolution, simple structure, direct drive, no brake mechanism, no bearing mechanism, these advantages are beneficial to the miniaturization of the device. Ultrasonic motors are widely used in the fields of optical instruments, lasers, semiconductor microelectronics processes, precision machinery and instruments, robotics, medicine, and bioengineering.
The mechanism of ultrasonic cleaning is to use physical effects such as cavitation, radiation pressure, and acoustic current when ultrasonic waves propagate in the cleaning liquid, which can peel off the dirt on the cleaning parts and promote the chemical reaction between the cleaning liquid and the dirt. Reaction to achieve the purpose of cleaning objects. The frequency used by the ultrasonic cleaning machine can be selected from 10 to 500 kHz according to the size and purpose of the cleaning object, generally 20 to 50 kHz. As the frequency of the ultrasonic transducer increases, Weifang Jude vibrators, longitudinal vibrators, thickness vibrators, etc. can be used. In terms of miniaturization, there are also radial and flexural vibrations that use disc vibrators. Ultrasonic cleaning has been widely used in various industries, such as industry, agriculture, household equipment, electronics, automobiles, rubber, printing, airplanes, food, hospitals, and medical research.
There are two types of ultrasonic welding: ultrasonic metal welding and ultrasonic plastic welding. Among them, ultrasonic plastic welding technology has been widely used. It uses the ultrasonic vibration generated by the transducer to transmit the ultrasonic vibration energy to the welding area through the upper weldment. Due to the large acoustic resistance of the welding zone, that is, the junction of the two weldments, local high temperature will be generated to melt the plastic, and the welding work will be completed under the action of contact pressure. Ultrasonic plastic welding can facilitate welding of parts that cannot be welded by other welding methods. In addition, it saves expensive mold costs for plastic products, shortens processing time, improves production efficiency, and is economical, fast, and reliable.
The fine abrasive is applied to the workpiece with a certain static pressure together with the ultrasonic processing tool, and the same shape as the tool can be processed. During processing, the transducer needs to produce an amplitude of 15-40 microns at a frequency of 15-40 kHz. The ultrasonic tool causes the abrasive on the surface of the workpiece to continuously impact with considerable impact force, destroying the ultrasonic radiation part, breaking the material, and achieving the purpose of removing the material. Ultrasonic processing is mainly used for the processing of brittle and hard materials such as gems, jade, marble, agate, and cemented carbide, as well as the processing of special-shaped holes and fine deep holes. In addition, when the ultrasonic transducer is added to the ordinary cutting tool to vibrate, it can also improve accuracy and efficiency.
Using the cavitation effect and micro-mechanical vibration of the ultrasonic transducer, the excess fat cells under the human epidermis are crushed, emulsified, and excreted, to achieve the purpose of weight loss and shaping. This is a new technology developed in the 1990s internationally. Zocchi from Italy used ultrasonic degreasing for the bed for the first time and succeeded, setting a precedent for plastic surgery and beauty. Ultrasonic fat removal technology has developed rapidly at home and abroad in the past 10 years.
Applying appropriate frequency and intensity of ultrasonic irradiation to plant seeds can increase the germination rate of seeds, reduce the rate of mildew, promote the growth of seeds, and increase the growth rate of plants. According to information, ultrasound can increase the growth rate of some plant seeds by 2 to 3 times.
The ultrasonic transducer is used to receive the pressure of the blood vessel. When the airbag compresses the blood vessel because the applied pressure is higher than the vasodilation pressure, the ultrasonic transducer cannot feel the pressure of the blood vessel; and when the airbag gradually deflates, the ultrasonic transducer When the pressure of the blood vessel decreases to a certain value, the pressure of the two reaches equilibrium. At this time, the ultrasonic transducer can feel the pressure of the blood vessel. This pressure is the systolic pressure of the heart. The blood pressure value. Because the electronic sphygmomanometer eliminates the stethoscope, the labor intensity of medical staff can be reduced.
In toxic, radioactive, and other harsh environments, people cannot approach work and need to be controlled remotely; electrical switches such as televisions, electric fans, and lights need to be remotely controlled, and ultrasonic transducers can be installed to transmit ultrasonic waves remotely. The receiving transducer on the control system converts the acoustic signal into an electrical signal to make the switch act.
In modern transportation, it is very necessary to automatically monitor the passing and counting of vehicles to grasp the operating conditions of vehicles. For example, a traffic supervision station installs an ultrasonic transducer and its auxiliary equipment for both transceivers, and when a vehicle passes by, a sound pulse returns. The number of daily vehicles can be obtained by counting and accumulating. Install a transmitter-receiver transducer at the rear of the car to prevent a reversing collision. Installing a receiving piezoelectric ultrasonic transducer on the highway can also monitor the noise index.
An ultrasonic distance measuring device is also called a sound ruler. It measures the pulse time interval through a transceiver with dual purposes. The current acoustic ruler can measure distances within 10m, with an accuracy of several thousandths.
For pressure systems, at leaks, jet noise is caused by the pressure difference between the inside and outside of the pressure vessel. This noise spectrum is extremely wide. For non-pressure systems, an ultrasonic source can be placed in a closed system and then received from outside the closed system. Generally, the measured signal amplitude is very small or no when there is no leakage, and the signal amplitude tends to increase suddenly at the leakage point. Gas flow detection is also one of the important methods in the chemical industry. There is a variety of amplification for flow detection, such as float flow meters. But the main advantage of using an ultrasonic transducer is that it does not hinder the flow of fluid.
To realize functions such as free walking in space and recognizing objects, intelligent robots must not only use ultrasonic transducers for distance measurement and guidance but also imaging recognition. Therefore, a small ultrasonic transducer array is needed to realize multiple functions. This aspect will become an important research topic, attracting many scientists to fight for it.
Weifang Jude Electronic Co. Ltd is a China famous ultrasonic transducer suppliers, providing ultrasonic cleaning transducer and piezoceramic sensor. If you have any needs, please contact us.
