Ultrasonic testing is a nondestructive method of detecting, locating, and evaluating internal discontinuities in metals and other materials. The basic principle involves directing a high frequency sound beam into the test material on a predictable path, which, upon reflecting back from an interruption in material continuity, produces a wave that is amplified and usually displayed as a vertical displacement on a CRT or LCD screen.

The detection, location and evaluation of material discontinuities become possible because (1) the velocity of sound through a given material is nearly constant, making distance measurement possible, and (2) the relative amplitude of a reflected pulse is more or less proportional to the size of the reflector.



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