Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-12-24
1994-01-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250226, 21912162, G01J 132
Patent
active
052817989
ABSTRACT:
Pulsed light sources, such as a flashlamp or laser, remove coatings from substrates via the ablation method. A photodetector circuit, sensing reflected light from the surface being ablated, provides a feedback signal that indicates the reflected color intensity of the surface being ablated. The boundary between the coatings or substrate surfaces is distinguished by a change in color intensity between an upper coating and an undercoating, e.g., between a topcoat of paint and a primer coat of paint, or between a coating and the substrate surface itself. The color intensity determination thus provides a measure relative to when one coating has been removed and another coating remains. The photodetector circuit is also useful for providing feedback information relative to the quality of a stripped work surface for quality control or other purposes.
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Hamm Richard R.
Hoogerwerf John D.
Le Que T.
Maxwell Laboratories Inc.
Nelms David C.
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