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Proceedings Paper

Eliminating the effect of plate thickness variation in ultrasonic images using a single transducer method
Author(s): Don J. Roth
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Paper Abstract

This article describes a single transducer ultrasonic imaging method based on ultrasonic velocity measurement that eliminates the effect of plate thickness variation in the image, i.e. the method is thickness-independent. The method, currently being commercialized under a cooperative agreement between NASA Lewis Research Center and Sonix, Inc., thus isolates ultrasonic variations due to material microstructure. Its use can result in significant cost savings because the ultrasonic image can be interpreted correctly without the need for precision thickness machining during nondestructive evaluation stages of material development. Images obtained using the thickness-independent methodology are compared with apparent velocity maps and c- scan echo peak amplitude images for monolithic ceramic and metal matrix composite materials having thickness and microstructural variations. It was found that he thickness- independent ultrasonic images reveal and quantify correctly areas of global microstructural variation due to the elimination of thickness effects.

Paper Details

Date Published: 15 November 1996
PDF: 11 pages
Proc. SPIE 2944, Nondestructive Evaluation of Materials and Composites, (15 November 1996); doi: 10.1117/12.259047
Show Author Affiliations
Don J. Roth, NASA Lewis Research Ctr. (United States)


Published in SPIE Proceedings Vol. 2944:
Nondestructive Evaluation of Materials and Composites
Steven R. Doctor; Carol A. Nove; George Y. Baaklini, Editor(s)

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