Measuring and testing – Vibration – By mechanical waves
Patent
1996-06-10
1998-09-29
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73643, 73657, 73159, G01N 2908, G01N 2924
Patent
active
058147306
ABSTRACT:
A non-destructive, non-contact testing apparatus and method which generally includes an ultrasonic signal generator for inducing one or more ultrasonic signals in a material and an optical interferometer that includes a laser for illuminating a section of the material and for detecting beat frequencies resulting from reflected light from the material. Deformations in the material as a result of the ultrasonic signal cause the beat frequency to be shifted as a result of the Doppler effect. Such differences in the beat frequency are detected by the system and used as an indication of a characteristic of the material.
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Berthelot Yves H.
Brodeur Pierre H.
Gerhardstein Joseph P.
Johnson Mont A.
Institute of Paper Science and Technology and Georgia Institute
Miller Rose M.
Williams Hezron E.
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