For electromagnetic non-destructive test procedures based on the emission of infrared ultrasonic waves onto the subject or item investigated, ultrasonic non-destructive test (NDT) equipment is employed. An aircraft's sound pressure level is significantly higher than that of a pinball on an arc or even a football being thrown at it. Even the most modern detecting technologies cannot detect the thickness of space shuttles or the thickness of most roofing tiles. The reason for this is that sound waves travel far faster through objects than they do through air.
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