Method and system for selective removal of material coating from a substrate using a flashlamp
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United States of America Patent
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Jan 25, 1994
Issued Date -
N/A
app pub date -
Dec 24, 1991
filing date -
Dec 24, 1991
priority date (Note) -
Expired
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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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