NASA NTRS · 19670000482
Surface-crack detection by microwave methods
Abstract
Microwave surface-crack detection system examines metallic surfaces with a noncontacting probe. The change in the microwave signal reflected from the surface under investigation is an indication of the existence of surface flaws. This technique can detect flaws and scratches as small as 100 microinches.
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Feinstein, L., Hruby, R.. 1967-12-01. Surface-crack detection by microwave methods. https://ntrs.nasa.gov/citations/19670000482
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