Acoustic Microscopy of Curved Surfaces

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1981
Authors
Weglein, R
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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The Metrology and Imaging modes of the acoustic reflection microscope are applied to spherically shaped specimens. Metrology is usually practiced by translating the specimen along the acoustic beam axis. This operation yields a measurement of the local Rayleigh velocity at a single location in the specimen plane. Imaging is accomplished through raster-scanning in the plane transverse to the beam axis. The two modes are, in effect, simultaneously employed when a nonplanar surface of' known curvature is scanned. The resulting image reveals nearly concentric rings with radial, periodic brightness variation, if the surface is spherical in shape. Stainless steel bearing balls of the type used in gyros are used to demonstrate the technique. It is suggested that the obtained images represent a two-dimensional map of elastic properties applicable to convex (bearing ball) and concave (bearing raceway) surfaces.

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