Ultrasonic Testing Equipment

https://www.bkneddy.com/ultrasonic-testing-equipment/

What is Ultrasonic?
The process of mechanical vibration propagation in the medium is called a wave. The human ear can feel the elastic wave with a frequency higher than 20 Hz and lower than 20,000 Hz, so the elastic wave in this frequency range is also called a sound wave. Elastic waves with a frequency of fewer than 20 Hz are also called infrasound waves, and elastic waves with a frequency higher than 20,000 Hz are called ultrasonic waves. Infrasound waves and the ultrasonic human ear can not feel. Ultrasonic Testing, abbreviated as UT, is an ultrasonic scanning technique and is one of five conventional NDT non-destructive testing methods.