Defect detecting method and apparatus

Details Defect detecting method and apparatus Defect detecting method and apparatus

1991-06-07

1992-09-08

Williams, Hezron E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

364508, 73646, G01N 2912

Patent

active

051448386

ABSTRACT:
A defect detecting method for detecting whether or not an object to be measured has a defect comprises the steps of vibrating the object to be measured, picking up the vibration, and detecting that a spectrum of the characteristic vibration of the object to be measured is separated into two portions. Also, a defect detecting apparatus comprises a vibrator vibrating an object to be measured, a detector for picking up an vibration of the object to be measured and for converting the vibration into an electric signal, and a signal processor for receiving the electric signal from the detector, for analyzing a spectrum of a characteristic vibration of the object to be measured, and for determining whether the defect is present or absent depending on whether a spectrum of a defect of the object to be measured is present or absent.

REFERENCES:
patent: 3106838 (1963-10-01), Crooks
patent: 3345861 (1967-10-01), Heath
patent: 3623358 (1971-11-01), Sugimoto
patent: 3659456 (1972-05-01), Marshall et al.
patent: 3842663 (1974-10-01), Harting et al.
patent: 3916699 (1975-11-01), Moran et al.
patent: 4114454 (1978-09-01), Ernyei et al.
patent: 4408294 (1983-10-01), Imam

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