NDT Method
How Ultrasonic Testing Works
A step-by-step explanation of how ultrasonic testing detects flaws and measures thickness using sound waves.
Overview
Ultrasonic testing works on the principle of sound reflection. A transducer converts electrical energy into high-frequency sound waves and couples them into the material through a gel or liquid couplant.
As the sound travels through the material, any change in density — a crack, void or the back wall — reflects part of the energy back. The instrument measures the time and amplitude of these echoes to locate and size defects.
The Process
- Couple the probe to the surface
- Transmit sound waves into the material
- Receive and time the reflected echoes
- Interpret echoes to locate and size defects
Frequently Asked Questions
Related Services
NDT Australia provides these services nationwide with certified, mobile inspectors and clear, compliant reporting.