Sound energy is a quick way to to spot voids, delamination, cracks, and other possible defects that are accessible from outside the chip or package, as well as some defects that are inside of chips. But acoustic inspection also is highly sensitive to different materials with different polarities, which can change the reflection of sound waves. Bill Zuckerman, product marketing manager at Nordson Test & Inspection, talks about balancing resolution, frequency, and penetration in acoustic inspection, where machine learning is entering the inspection process, and why this technology is considered complementary to X-ray inspection.

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