1. Ultrasonic diagnostic instrument
Can be used to diagnose lesions of organs and tissues in the human body. It is commonly used in hospitals because it is non-invasive and non-radioactive. Especially in the field of obstetrics, due to the sensitivity of fetuses to radiation, diagnostic equipment such as X-ray and CT are basically not used on the fetus or mother. In this case, ultrasound becomes the best choice.
Compared with X-ray and CT, ultrasonic diagnostic equipment has two characteristics. The first is that it is non-radioactive, which means it is highly safe. The second is that it is real-time. The images seen are real-time and do not require This not only saves time waiting for film development or digital imaging, but also enables real-time measurement. It can be applied in the cardiovascular field to measure blood flow velocity to diagnose lesions.
2. Ultrasonic cleaning machine
Can be used for cleaning purposes. It is generally believed that this utilizes the "cavitation phenomenon" of ultrasonic waves in liquids. The cleaning principle of the ultrasonic cleaning machine is to use ultrasonic waves to vibrate clean water to generate fine vacuum bubbles in the water. When the vacuum bubbles burst, the energy stored in the bubbles is released, releasing temperatures of about 5000°C and more than 10,000 pounds of water. The pressure lifts away grease or dirt from the surface of the object.
The frequency of ultrasonic waves generated by the cleaning machine is about 20-50kHz, which can be used to clean jewelry, lenses or other optical instruments, dental equipment, surgical equipment and industrial parts. In addition to purely mechanical ultrasonic whistles that can emit lower frequencies, general ultrasonic equipment consists of ultrasonic power supply, transducer, horn, tool head, etc.
There are two types of transducers: piezoelectric ceramic transducers and magnetic transducers. The theory of transducers and horns can also be considered a specialized discipline.
3. Ultrasonic degreasing
Place the parts with oil stains in the degreasing liquid, and subject the degreasing process to an ultrasonic field of a certain frequency. , called ultrasonic degreasing. The introduction of ultrasonic waves can strengthen the oil removal process, shorten the oil removal time, improve the oil removal quality, and reduce the consumption of chemicals.
Especially for parts with complex shapes, small precision parts, parts with difficult-to-remove dirt on the surface and parts made of insulating materials, it has a significant degreasing effect, which can save time-consuming manual labor and prevent parts from deteriorating. damage.
4. Ultrasonic distance meter
Used to measure distance. The ultrasonic transmitting device emits ultrasonic waves, and the distance can be known based on the time difference when the receiver receives the ultrasonic waves. This is similar to the principle of radar ranging. The ultrasonic transmitter emits ultrasonic waves in a certain direction and starts timing at the same time as the launch time. The ultrasonic waves propagate in the air and return immediately when they encounter obstacles on the way. The ultrasonic receiver stops timing immediately when it receives the reflected waves.
5. Ultrasonic humidifier
Theoretical research shows that under the same amplitude conditions, the vibration energy of an object is proportional to the vibration frequency. When ultrasonic waves propagate in the medium, the medium particles The frequency of vibration is very high and therefore the energy is very high.
In the dry winter in northern China, if ultrasonic waves are passed into a water tank, the violent vibration will break the water in the tank into many small droplets, and then use a small fan to blow the droplets into the room. It can increase indoor air humidity, which is the principle of ultrasonic humidifier.
Reference: Baidu Encyclopedia-Ultrasound