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:
Jul. 26, 1988
Filed:
Mar. 17, 1987
Erhard Ortlieb, Kalchreuth, DE;
Peter Wahode, Neunkirchen, DE;
Kraftwerk Union Aktiengesellschaft, Mulheim, DE;
Abstract
An apparatus for determining the depth of cracks in the surfaces of workpieces includes an ultrasonic transducer for sending ultrasonic signals to and receiving ultrasonic signals from the workpiece, an analyzer connected to the ultrasonic transducer for forming a frequency spectrum from the ultrasonic signals, an evaluating unit connected to the analyzer for determining an effective band width correlated with the depth of the cracks in the workpiece as the quotient of the integral of the frequency spectrum and the ordinate value of the center of concentration of the integrated surface of the frequency spectrum, and an indicator connected to the evaluating unit for indicating the depth of the cracks.