The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1981
Filed:
Feb. 21, 1980
Erik Primbsch, Cologne, DE;
Krautkramer-Branson, Inc., Stratford, CT (US);
Abstract
The acoustic energy responsive deformation of a workpiece surface is sensed in a contact-free manner by optical means using a laser which illuminates the surface at which deformation is expected. The reflection light energy is transmitted to an optical interferometer as previously shown in the art. The present improvement comprises the use of a multi-wavelength laser beam light and separating the light after passing through the interferometer into the distinct wavelengths. Each light signal corresponding to a specific wavelength is converted individually to an electrical signal, each electrical signal is rectified, and the plurality of rectified signals are then averaged in an electrical summing means.