Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-05-13
1992-02-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356446, G01N 2188
Patent
active
050878220
ABSTRACT:
Apparatus and method for inspecting surface quality of a moving sheet of metal illuminates a surface of the moving sheet by the use of at least two lamps. The region which is illuminated by the lamps is inspected by a sensing device. The angle of incidence for the light beams from the lamps are from the near and dark fields. The sensing device picks up highlighted or brightened portions of the sheet due to surface irregularities. By use of a multiplicity of lamps and a single sensing device, such as a video recorder, an inexpensive yet very sensitive system is provided for detecting irregularities in the surface of the moving sheet. The system may be observed by an operator to determine locations of irregularities and as well the system may be adapted to document locations on the moving sheet where the irregularities occur.
REFERENCES:
patent: 3892492 (1975-07-01), Eichenberger
patent: 4539561 (1985-09-01), Wulff
patent: 4595289 (1986-06-01), Feldman et al.
patent: 4629319 (1986-12-01), Clarke et al.
patent: 4675730 (1987-06-01), Asomaitis et al.
patent: 4806776 (1989-02-01), Kley
patent: 4863268 (1989-09-01), Clarke et al.
Otto Meijer and Doug Keim, Design and Performance of a High Speed Surface Inspection System From Aluminum Strip, IEEE Conference at San Diego (1989).
Fairlie Matthew
Fraser Warren
Meijer Otto
Smith David
Alcan International Limited
Le Que T.
Nelms David C.
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