METHOD FOR ANALYZING THE JOINDER BETWEEN A PAIR OF ABUTTING MEMBERS

A transducer induces vibrations into a member including at least a pair of members joined to one another along a common surface. An exposed section of the two members, which may or may not include one line of their joinder, is illuminated with a source of coherent light while it is being vibrated an...

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Bibliographic Details
Main Author RALPH M. GRANT
Format Patent
LanguageEnglish
Published 29.02.1972
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHIC PROCESSES OR APPARATUS
HOLOGRAPHY
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES
MEASURING
PHOTOGRAPHY
PHYSICS
TESTING
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Summary:A transducer induces vibrations into a member including at least a pair of members joined to one another along a common surface. An exposed section of the two members, which may or may not include one line of their joinder, is illuminated with a source of coherent light while it is being vibrated and a photographic plate is exposed to both the reflected light and the direct coherent light. The plate is developed to provide a hologram which is then properly illuminated to recreate a visual image of the surface section. The visual image will contain fringe lines and/or shaded areas as a result of interference between light waves reflected from the member at the high and low points of its vibration. Anomalies in these lines and areas will reveal discontinuities in the joinder between the two members which affect the pattern of vibration of the surface section.
Bibliography:Application Number: USD3645129