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:
Oct. 06, 1981
Filed:
Apr. 11, 1980
J Montgomery Rainey, Dayton, OH (US);
Francis M Taylor, Xenia, OH (US);
Systems Research Laboratories, Inc., Dayton, OH (US);
Abstract
A microprocessor-based ultrasonic inspection system reliably detects fatigue cracks smaller than 0.030 inch under installed fasteners by means of a unique signal-processing method. The signal-processing used in this invention takes advantage of the fact that crack signals 'walk' in time as a transducer moves around a fastener. Bolt size, scan depth, and angle of incidence of an ultrasonic shear wave are used to determine the 'walk rate' of a defect in the inspection zone. With this geometric information, the signal-processing technique will enhance any pulse-echo return 'walking' at the computed walk rate, and thus significantly improve the ratio of crack signal to other signal sources in the material.