Air-coupled ultrasound inspection as a new non-destructive testing tool for quality assurance

Rainer Stößel
Conventional ultrasound inspection has been a standard non-destructive testing method for a long time. In most cases, though, a liquid coupling medium, such as water or gel, is required because of the huge impedance mismatch at a solid-air boundary. The physical contact with a liquid medium is a drawback because it prevents ultrasound inspection of many important materials. Modern industry, however, has a growing need for new, improved and remote non-destructive testing techniques for the...
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