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PRECISION ULTRASONIC THICKNESS GAGING.

By Elfbaum, Gerry M.; Fowler, Kenneth A.; Smith, Karen A.
Publication: Quality In Manufacturing
Date: Sunday, July 1 2001

Ultrasonic nondestructive testing (NDT)--using high-frequency sound waves--is a widely used technology for characterizing material thickness, integrity, or other physical properties as a means of quality control. Ultrasonic techniques permit quick and reliable measurement of thickness without requiring access to both sides of a part. Accuracies as high as [+ or -]1 micron or [+ or -]0.0001" are achievable in some applications.

Most engineering materials--metals, plastic and composites--can be measured ultrasonically. Often, on-line or in-process measurement of extruded

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