US Government As Represented by the Secretary of the Army

Warren P Mason

John T Kuo

Daniel N Beshers

A vibrator is held in contact with a structure undergoing testing, such as n airplane wing. Vibrations are distributed through the structure and structural defects such as fissures will respond by emitting an acoustic signal. The acoustic signal may occur over a wide frequency range. A pick-up having a crystal transducer also makes contact with the surface of the structure to detect acoustic emissions. The crystal has a wide band response capable of detecting structural defect acoustic emissions. The pick-up has electrical leads connected thereto so that the acoustic emissions are converted to electrical signals which may be recorded or viewed on an oscilloscope. Movement of the pick-up across the surface of the structure will help determine the location of the structural defect.

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West Orange, NJ, United States of America

Warren P Mason