Directed acoustic shearography

Russell M. Kurtz

doi:10.1117/12.866872

20 April 2010 Directed acoustic shearography

Russell M. Kurtz

Proceedings Volume 7675, Photonics in the Transportation Industry: Auto to Aerospace III; 76750B (2010) https://doi.org/10.1117/12.866872
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

Modern vehicles use modern materials, including multiple metallic layers, composites, and ceramics. This has led to significant improvements in quality, reliability, and lifetime, at the cost of significantly increased complexity. It is particularly difficult to test these modern materials for buried defects such as internal corrosion, glue/weld failures, and disbonds, yet these defects can lead to damage and even failure of the part. As one tool in the array of nondestructive evaluation (NDE) technologies, we report on Directed Acoustic Shearography (DAS), which combines the sensitivity of shearography with the speed of ultrasonic imaging, and adds improved depth resolution. We show that DAS is particularly useful in detecting buried defects in modern materials, how it lends itself to automation, and present early tests of DAS detecting buried defects as small as 1/32 inch in a multilayer aluminum structure.

Citation Download Citation

Russell M. Kurtz "Directed acoustic shearography", Proc. SPIE 7675, Photonics in the Transportation Industry: Auto to Aerospace III, 76750B (20 April 2010); https://doi.org/10.1117/12.866872

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