Apparatus and process with an annular fluorescent tube for detec

Details Apparatus and process with an annular fluorescent tube for detec Apparatus and process with an annular fluorescent tube for detec

1993-06-10

1995-04-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502081, 382 8, 348132, G01N 2188

Patent

active

054081041

ABSTRACT:
An apparatus and a process for detecting surface defects on moving long metallic products utilizing linear CCD cameras for effecting exposures at successive times t1, t2,t3 . . . Tn. A processing device calculates differences observed for each pixel or assemble of pixels at the successive times and any variations in the differences makes it possible to detect defects and the extent of the defects. The use of thresholds allows for reduction in the background noise and different orientations of the optical axis of the camera permit the detection of different types of defects.

REFERENCES:
patent: 4817184 (1989-03-01), Thomason et al.
patent: 5086232 (1992-02-01), Maguire et al.
Iron and Steel Engineer, vol. 67, No. 5, May 1990, pp. 26-29, M. Ho, "Surface Inspection System With Defect Classification".

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