WHAT IS ULTRASOUND
We know that when objects vibrate, they make sounds. Scientists call the number of vibrations per second as the frequency of sound, whose unit is hertz. The frequency of sound we can hear in human ears is 20~20000 Hz. When the vibration frequency of the sound wave is greater than 20000 Hz or less than 20 Hz, we can not hear it. Therefore, we call the frequency higher than 20000 Hz acoustic wave "ultrasonic". The frequency of ultrasound commonly used for medical diagnosis is 1~5 MHz. Ultrasonic has the advantages of good directivity, strong penetrating ability, easy to get concentrated acoustic energy and long distance in water. It can be used for ranging, speed measurement, cleaning, welding, gravel and so on. It has many applications in medicine, military, industry and agriculture.
The theoretical study shows that, under the same amplitude, the vibration energy of an object is proportional to the frequency of vibration. When the ultrasonic wave is propagated in the medium, the frequency of the vibration of the medium is very high, thus the energy is very high. In the dry winter in the north of our country, if the ultrasonic wave is passed into the tank, the violent vibration will break the water in the tank into a lot of small. The fog drop, then use the small fan to blow the fog into the room, can increase the indoor air humidity. This is the principle of ultrasonic humidifier, pharyngitis, tracheitis and other diseases. It calls for the inability of the blood flow to reach the sick part of the Jin year. Using the principle of humidifier, it can make the liquid atomized, let the patient inhaled, improve the curative effect. Use ultrasonic wave to be huge. The energy can also make the stone in the body vibrate severely and break down, thereby slowing down the pain and achieving the goal of cure.
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