 Ultrasonic horn

An ultrasonic horn (also known as acoustic horn, sonotrode, acoustic waveguide, ultrasonic probe) is a tapering metal bar commonly used for augmenting the oscillation displacement amplitude provided by an ultrasonic transducer operating at the low end of the ultrasonic frequency spectrum (commonly between 15 and 100 kHz).The device is necessary because the amplitudes provided by the transducers themselves are insufficient for most practical applications of power ultrasound.