G - Physics – 01 – N
Patent
G - Physics
01
N
324/50
G01N 21/39 (2006.01) G01N 21/89 (2006.01)
Patent
CA 1133063
47,995 -19- ABSTRACT OF THE DISCLOSURE This invention is a system of automatically clas- sifying defects both for sorting defective products (metal- lic surfaces, especially tube surfaces) as to the reworking operation required for correcting the defect, and for clas- sifying the defect as to the preceding manufacturing opera- tion which is the most probable cause of that defect and sending a signal to that operation to provide for adjust- ments to minimize future defects. The system uses a source of electromagnetic radiation (typically a laser beam which is scanned across the surface) and at least two sensors (adjusted such that the radiation is reflected from a defect- free surface principally received by one of the sensors but that there is a measured amount of radiation in the other sensor). An average signal of the principal sensor is developed as a function of scan position. Threshold cir- cuitry detects when the ratio of sensor signal to average signal varies by a predetermined amount. Special circuitry is used to detect the essentially simultaneous occurrence of at least two different preselected combinations of signal variations to identify the type of defect.
332480
Kennedy Paul G.
Miller Robert C.
Sarkozi Miklos
Yaroshuk Nicholas
Mcconnell And Fox
Westinghouse Electric Corporation
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