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Frequency: F ≥ 20KHz (in practice because the application is similar to the effect of, usually F ≥ 15K ultrasonic sound waves, also known as); power density: p = transmitter power (W) / emission area (cm2); usually p ≥ 0.3w/cm2; ultrasonic propagation in liquid the surface of the soil can be cleaned, the principle can be used "cavitation" phenomenon explains: ultrasonic vibration propagating sound wave in the liquid when the pressure reaches atmospheric pressure, the power density is 0.35w/cm2, the ultrasonic sound wave pressure time vacuum or negative pressure can reach a peak, but in fact no negative exists, resulting in a lot of pressure in the liquid, the liquid molecules to pull fragmented into a hole cavitation nuclei. This is very close to a vacuum cavity, in which the maximum back pressure of the ultrasonic burst, generating strong
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