ABSTRACT
If you are a materials scientist, you will probably have encountered ultrasound in the context of the pulse echo technique used in nondestructive testing. This ›eld is often referred to as diagnostic ultrasound and it has expanded enormously from its origins of fault or crack detection to encompassing of medical imaging. However, there is an altogether different range of applications of ultrasound that have been used for modi›cation of the physical and chemical properties of the materials and in processing. This latter ›eld has its origins in two uses in materials technology-ultrasonic cleaning and welding.
