Ultrasonic testing is a non destructive testing method based on the ability to use propagation of ultrasonic waves in order to detect defects inside tested object but also to characterize materials and measure their thickness, while keeping the inspected object intact. This method can be used to test many materials including steel, wood, concrete and composites.
When the reflection method (or pulse-echo mode) is used, the ultrasonic transducer will both send and receive the ultrasonic waves. Distance (or material thickness) is measured as a function of the arrival time of the reflection, while its amplitude and intensity represents flaws and changes in the material. In attenuation method (or through-transmission mode) the ultrasonic waves will be sent through the tested object from a transmitter to a receiver.
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