Defect detecting method and apparatus

Details Defect detecting method and apparatus Defect detecting method and apparatus

1992-02-24

1993-01-19

Williams, Hezron E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73602, 73659, 364508, G01N 2912

Patent

active

051798603

ABSTRACT:
A defect detecting method for detecting whether or not an object to be measured has a defect includes 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 includes a vibrator for vibrating an object to be measured, a vibration detector for picking up a vibration of the object to be measured and for converting the vibration into an electric signal, and computation process and determination equipment 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 a 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: 2486984 (1949-11-01), Rowe
patent: 2876638 (1959-03-01), Diamond
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: 4408294 (1983-10-01), Iman
patent: 4829823 (1989-05-01), Michel

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