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| Characteristics and Application of Ultrasound |
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| Source：Suzhou Jiahui Ultrasonic Technology Co., Ltd Release time：2018-11-17 |
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Communication characteristics
Ultrasound wave length is relatively shorter than sound wave. Usually obstacles are much longer than the wave length of ultrasound. So the diffraction ability of ultrasound is not very strong. Under the condition of constant medium density, ultrasound can propagate along a straight line in the direction of the wave. The shorter the wave length of ultrasound, the better the direct radiation ability.
Because of its high frequency and short wavelength, ultrasound has many unique properties in the process of propagation.
1) Good direction. Because of the high frequency of ultrasonic wave, its wavelength is much shorter than that of sound wave in the same medium, and the diffraction phenomenon is not obvious, so the propagation direction of ultrasonic wave is good.
2) High energy. When the amplitude of ultrasonic wave is the same, the higher the vibration frequency, the greater the energy. Therefore, it has much more energy than ordinary sound waves.
3) Strong penetration ability. Although ultrasound attenuates strongly in gases, it attenuates weakly in solids and liquids. In opaque solids, ultrasound can penetrate tens of meters in thickness, so it is widely used in solids and liquids.
4) Cavitation. When propagating in liquids, ultrasonic waves are as dense as sound waves. During the compression stage, the voids are compressed until they collapse. Discharge and luminescence occur when the hole collapses, which is called cavitation. The molecule of liquid is transmitted by the ultrasonic energy, and the interaction of molecule produces a large number of bubbles. These bubbles constitute the precondition of cavitation. When the energy gathers to a certain extent, the bubble bursts and produces huge energy to break the whole liquid. Cavitation is often used in ultrasonic cleaners and small ultrasonic cleaners.
Application of Ultrasound
Ultrasound is widely used in industrial and agricultural production. Including ultrasonic testing, ultrasonic flaw detection, power ultrasound, ultrasonic treatment, ultrasonic diagnosis, ultrasonic treatment, etc.
Ultrasound can be used to detect and detect materials in industry. It can measure physical parameters of gas, liquid and solid. It can also measure thickness, liquid level height, flow rate, viscosity and hardness. It can also inspect welds and bonds of materials.
Ultrasonic cleaning and processing can be applied to cutting, welding, spray, emulsification, electroplating and other processes. Ultrasound cleaning is an efficient method and has been used in sophisticated and precision industries. High-power ultrasound can be used in mechanical processing, so that ultrasound can be applied in pipe drawing, wire drawing, extrusion and riveting processes.
Ultrasound diagnosis has developed rapidly in medicine, and has become one of the three major imaging diagnostic methods in medicine. It has been used in different occasions with X-ray and isotope, such as ultrasound physiotherapy, ultrasound diagnosis, cancer treatment and lithotripsy.
In agriculture, the killing characteristics of ultrasound on organic cells can be used to disinfect and sterilize, and the ultrasonic treatment of crop seeds is conducive to seed germination and crop yield increase.
In addition, ultrasonic liquid treatment and purification can be applied to environmental protection, such as ultrasonic water treatment, fuel emulsification, atmospheric dust removal and so on.
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