Non-destructive testing (NDT) has shown tremendous growth in the last half century. Its ability to provide safe volumetric inspection of materials with limited access areas makes ultrasonic testing (UT) one of the fastest growing technique in NDT. However, the Achilles heel of ultrasonic testing has always been transfer of energy from the UT probe into the material subject to the inspection. Because air limits the transfer of ultrasound, the transducers need to be coupled to the material using a liquid that promotes the transfer of energy into the material.
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