The Non-Destructive Testing (NDT) method uses high frequency sound waves in the range of 0.2 – 25 MHz to detect discontinuities in the piece to be tested. Here, Hertz (Hz) is a unit of frequency, which is equal to the number of vibrations per second.
Ultrasonic Test is based on the principle of partial or complete reflection (echo) of the sound beam emitted within the material as a result of the change in acoustic impedance (the resistance of a material against sound propagation).
