Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1978-10-24
1980-02-19
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 338
Patent
active
041888308
ABSTRACT:
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.
REFERENCES:
patent: 2014410 (1935-09-01), Pierce
patent: 2559565 (1941-10-01), Hutcheson
patent: 3529465 (1970-09-01), Kleesattel et al.
patent: 3985024 (1976-10-01), Horak
patent: 4089224 (1978-05-01), Scott et al.
Beshers Daniel N.
Kuo John T.
Mason Warren P.
Edelberg Nathan
Elbaum Saul
Gibson Robert P.
Myracle Jerry W.
The United States of America as represented by the Secretary of
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