Ultrasound is sound with frequencies above the range of human hearing frequencies starting at around 16 kHz.
This range is used for many purposes in medical engineering, but also in industry, and research. The spectrum of applications in medical technology extends from pumping and dosing to diagnostics and therapy.
The creation and detection of ultrasound is a classic piezo application because the piezo element starts to oscillate when an A.C. voltage is applied. The short response times and the high dynamics of this motion naturally also benefit ultrasound generation.
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