Apparatus and process with an annular fluorescent tube for detection in a moving mode of surface defects on long metallic products
US5408104A · kind A · utility
10Cited by
2References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Jun 10, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30164
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.