Method and apparatus for receiving ultrasonic waves by optical means

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United States of America Patent

PATENT NO 4388832
SERIAL NO

06279606

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Abstract

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In an apparatus for receiving ultrasonic waves by optical means a laser beam illuminates a workpiece surface at which ultrasonic waves are manifest in the form of cyclically occurring surface deformations. The reflected light is transmitted to an optical interferometer as a measuring light beam and the beam exiting from the interferometer is converted to an electrical signal and amplified to provide a measuring beam responsive electrical signal. A portion of the laser beam immediately before being incident on the workpiece surface is also passed through the interferometer as a comparison beam. The exiting comparison beam light is converted to an electrical signal, amplified and time delayed to provide a comparison beam responsive electrical signal. By means of a subtracting circuit the comparison beam responsive electrical signal is subtracted from the measuring beam responsive electrical signal to provide a difference signal which is evaluated. The time delay is adjusted to cause the difference signal to be free of the frequency and amplitude responsive variations of the laser beam. In a Michelson type interferometer both light beams traverse the same paths in the same direction, but spatially separated. In a Mach-Zehnder interferometer both light beams traverse the same paths in respective opposite directions.

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Patent Owner(s)

Patent OwnerAddress
KRAUTKRAMER-BRANSON INC250 LONG BEACH BLVD A CORP OF CT STRATFORD CT

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kaule, Walter Cologne, DE 4 43

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