Eliminating the effect of plate thickness variation in ultrasonic images using a single transducer method

Don J. Roth

doi:10.1117/12.259047

15 November 1996 Eliminating the effect of plate thickness variation in ultrasonic images using a single transducer method

Don J. Roth

Author Affiliations +

Proceedings Volume 2944, Nondestructive Evaluation of Materials and Composites; (1996) https://doi.org/10.1117/12.259047
Event: Nondestructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1996, Scottsdale, AZ, United States

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.

Citation Download Citation

Don J. Roth "Eliminating the effect of plate thickness variation in ultrasonic images using a single transducer method", Proc. SPIE 2944, Nondestructive Evaluation of Materials and Composites, (15 November 1996); https://doi.org/10.1117/12.259047

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