Defect detection

Details Defect detection Defect detection

1979-01-08

1981-11-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356431, G01N 2188

Patent

active

042988080

ABSTRACT:
A method for indicating a defect in a workpiece, comprises applying a continuously variable signal derived from inspection of the workpiece and including a pulse component representative of the defect to a bank of filters having different frequency transmission characteristics respectively representative of defects of different type so that the filter corresponding most closely to the defect inspected, produces a relatively greater output and provides an indication of defect type.

REFERENCES:
patent: 3803420 (1974-04-01), Bossons
patent: 3851971 (1974-12-01), Koch
patent: 3866054 (1975-02-01), Wolf
patent: 4110048 (1978-08-01), Akutsu et al.

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