Transducer hears material defects.(Technology Trends)

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NIST researchers claim to have unfolded an inexpensive wave transducer
that will make it easy to determine if of recent origin composite materials or
coatings fit mechanical properties for specific applications. The
device will also be able to expose surface and subsurface defects
in metallic and composite materials.

The acoustic wave transducer jaculates pulsed sound waves through parts
submerg in water. The throw backed wave speed measures elasticity or
flexibility below stress, while the wave direction provides information
concerning crystal