Misunderestimating: Ultrasound inspection of welds

New technique may improve inspection of metal structures.
Researchers have developed a technique that allows ultrasound to penetrate bone or metal, using customized structures that offset the distortion usually caused by these so-called "aberrating layers."

While initial use will probably be medical, "These metamaterials could also be used in industrial settings," says Dr. Yun Jing, senior author of the paper. "For example, it would allow you to use ultrasound to detect cracks in airplane wings under the wing's metal 'skin.'"

And if it works there, I ask what's to prevent it from being used in a metal fabrication shop or on a construction jobsite?

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