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. 09, 1992
Filed:
Dec. 26, 1989
Manohar Bashyam, Mason, OH (US);
David C Copley, Loveland, OH (US);
General Electric Company, Cincinnati, OH (US);
Abstract
A method for locating and identifying defects in a variable geometry workpiece using first and second transceivers positioned of a preselected distance apart adjacent opposite surfaces of the workpiece and aligned to direct ultrasonic signals toward each other through the workpiece. An ultrasound signal is transmitted from each transceiver toward the workpiece. Signal reflections from each adjacent workpiece surface are detected and used to compute workpiece thickness. Signals from one transceiver are detected at the other transceiver and their intensity determined. The signal intensity is normalized in proportion to the obtained workpiece thickness to establish a signal intensity independent of workpiece thickness. In one form, at least three signal processing paths, each having a different preselected gain, provide three signals of different amplified intensities for each measurement point. The one of the signals having the greatest amplitude not exceeding an established maximum processable signal intensity is selected and the actual intensity of the signal passing through the workpiece is computed by correlating the amplitude of the selected one of the three signals with the gain of the channel from which the signal is selected. A signal intensity corresponding to the actual intensity is displayed on an intensity responsive display for each measurement point after the actual intensity is adjusted for workpiece thickness.