What Is Ultrasound?
Ultrasound is the term applied to sound frequencies beyond the range of human hearing, i.e., frequencies of 20 kHz or higher. The transducers most widely used in practice are either of the magnetostrictive or piezoelectric type. The magnetostrictive effect uses magnetic energy to generate ultrasound waves by producing a cyclic change in the length of metal rods. Piezoelectric transducers generate ultrasound by the transformation of a high-frequency electrical voltage into intense mechanical vibrations. Our ultrasound therapy instruments function by the reverse piezoelectric effect (conversion of electrical to mechanical energy).
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