Title: Interferometric method and apparatus for sensing surface deformation of a workpiece subjected to acoustic energy

Abstract: In contact-free testing a workpiece by ultrasonic energy an interferometric method and apparatus is used to sense acoustic energy by determining the deformation of a workpiece surface while such workpiece is undergoing acoustic exploration. The surface of the workpiece is illuminated by a laser beam which is reflected thereat and reaches an optical beam splitter to produce a measuring beam portion and a reference beam portion. The measuring beam portion after reflection at a mirror is transmitted to photoelectric means, while the reference beam portion is time delayed via an optical delay path and then brought to interfere with the measuring beam portion at the photoelectric means.

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Inventors: Kaule, Walter (Cologne, DT)

Application Number: 629062
Filing Date: 1975-11-05
Publication_date: 1977-09-06
Assignee: Krautkramer-Branson, Incorporated (Stratford, CT)
Primary Class(es): 356/35.5 73/596, 73/643, 73/657, 356/502
Other Classes:
US Patent Ref:

3319515	May, 1967	Flournoy	356/108.
3503012	Mar, 1970	Gillard	356/106.
3535024	Oct, 1970	Schindler	356/106.
3633987	Jan, 1972	Brooks	356/109.
3822942	Jul, 1974	Hock	356/106.

Other Refs:
Primary Examiner: Corbin, John K.
Assistant Examiner: Koren, Matthew W.
Attorney: Steinberg; Ervin B., Feig; Philip J.