Methods of and apparatus for inspecting surfaces for defects

Details Methods of and apparatus for inspecting surfaces for defects Methods of and apparatus for inspecting surfaces for defects

1990-06-29

1992-02-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356376, G01N 2188

Patent

active

050862324

ABSTRACT:
A method of inspecting a surface of a member such as a motor vehicle body panel includes the steps of setting up the member at an inspection site, directing light on to the surface at a high angle of incidence so as to form a transverse trace across the surface and to reflect light from the surface with a low angle of deflection to form an image of the trace on a detection screen. A record of the image is produced. The trace is also viewed and recorded directly from a position substantially perpendicular to the surface. The records of the image and of the trace are analysed together to give an indication of the nature of the surface at the trace. The light is scanned in relation to the member to form further transverse traces across the member and the new traces and images are also analysed.

REFERENCES:
patent: 4306813 (1981-12-01), Sick
patent: 4759074 (1988-07-01), Iadipaolo et al.
patent: 4966455 (1990-10-01), Avni et al.
patent: 4966457 (1990-10-01), Hayano
GM Scrutinizes Body Surfaces, Automotive News OEM edition, Jan. 9, 1989, Vision 3D, brochure.
S. S. Hupp and T. B. Hackett of Ashland Chemical, Quantitative Analysis of Surface Quality for Exterior Body Panels, Feb. 29-Mar. 4, 1988, Loria Surface Analyzer System, brochure.

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