Ultrasonic Testing (UT) is a non-destructive inspection method that uses high frequency sound energy to conduct examinations and make measurements. Ultrasonic inspection can be used for flaw detection/evaluation, dimensional measurements, material characterization, and more. A typical UT inspection system consists of several functional units, such as the receiver, transducer, and display device. The receiver is an electronic device that can produce high voltage electrical pulses. Driven by the receiver the transducer generates high frequency ultrasonic energy. The sound energy is introduced and propagates through the materials in the form of waves. When there is a discontinuity (such as a crack) in the wave path, part of the energy will be reflected back from the flaw surface. The reflected wave signal is transformed into and electrical signal by the transducer and and is displayed on the display device screen. Ultrasonic Inspection is a very useful and versatile NDT method. Some of the advantages of ultrasonic inspection include:
It is sensitive to both surface & subsurface discontinuities
The depth of penetration for flaw detection or measurement is superior to other NDT methods.
Only single-sided access is needed when the pulse-echo technique is used.