Ultrasound is cyclic sound pressure with a frequency of 20 kilohertz or over, greater than the upper limit of human hearing.

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Nondestructive Material Testing with Ultrasonics
Introduction to the basic principles.
Ultrasonics
Dedicated to the art and science of ultrasonic nondestructive testing and allied fields.
Vibrationdata.com Tutorials
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August 21, 2016 at 13:26:00 UTC
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