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:
Nov. 06, 1984
Filed:
Aug. 14, 1981
Robert C Miller, Penn Hills, PA (US);
Walter J Carr, Jr, Wilkins, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A detector operable to detect cracks in a rotating member generates an alternating eddy current in the rotating member with an external coil surrounding the rotating member. A pick-up coil senses changes in the magnetic field of the eddy current due to a crack. The frequency of the excitation current is very much lower than the frequency of rotation of the rotating member and a plurality of samples are taken for each degree location. The output signal of the pick-up coil is comprised of both the crack indicative component and a residual or induced magnetism component. The signal is processed so as to extract the desired crack indicative component.