Measuring and testing – Vibration – By mechanical waves
Patent
1989-12-26
1992-06-09
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73614, G01N 2900
Patent
active
051196786
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.
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ASM Handbook Committee; Metals Handbook; 8th Edition; vol. 11; pp. 170-174.
Manohar Bashyam, "An Improved Display Technique For Ultrasonic Through Transmission Inspection of Composite Materials to Quantify Defects", Drexel University Symposium on Ultrasound Imaging, Sep. 21-23, 1987.
Bashyam Manohar
Copley David C.
Arana Louis M.
General Electric Company
Moore, Jr. Charles L.
Squillaro Jerome C.
Williams Hezron E.
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