Title:
Material Characteristic Testing Method And Apparatus Using Interferometry To Detect Ultrasonic Signals In A Web
Material Characteristic Testing Method And Apparatus Using Interferometry To Detect Ultrasonic Signals In A Web
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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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9/29/1998
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Patent