Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-07-16
1992-11-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022729, 356237, G01N 2188
Patent
active
051646030
ABSTRACT:
An apparatus 10 for inspecting the surface of an object S moving in the direction of travel 23 relative to the apparatus comprises a modular sensing head assembly 11 including a plurality of sensing head modules 12, 13, each of which includes a number of sensing stations 16-21. Each sensing station includes a light source 77, 81, 84 for generating a line of light extending across substantially the width of the surface of the object and a plurality of optical detector means for detecting light scattered from the line of light by the surface of the object. The optical detectors are positioned and oriented to receive scattered light scattered along paths lying in detection planes which are perpendicular to each other and perpendicular to the surface of the object. Signal processing electronics are provided to convert the light received by the detectors into analog signals which are multiplexed, converted to digital signals, filtered and then compared to preselected thresholds to determine the existence of any defects in the surface.
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Hartman Nile F.
Larsen James W.
Verber Carl M.
McDonald Alan T.
Nelms David C.
Reynolds Metals Company
Shami K.
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