Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2006-08-18
2008-12-09
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S559400
Reexamination Certificate
active
07462809
ABSTRACT:
An improved system for visual inspection of substrates coated with paints and polymers is disclosed. Painted substrates can be inspected for environmental and physical damage such as corrosion and cracks without removing the paint. The present invention provides the ability to maximize paint thickness penetration. This is accomplished with a spectral bandpass filter that rejects reflected light from the coating opaque bands, while allowing light in the paint window to pass to an IR detector such as an IR camera focal plane. The narrow bandpass range enhances the ability for IR imaging to see through thicker paint layers and improves the contrast over standard commercial IR mid-wave cameras. The bandpass may be adjusted to coincide with the full spectral window of the paint, consistent with the ability of the imaging focal plane to detect light in the spectral region.
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Chu Steven
DiMarzio Donald
Fonneland Nils Jakob
Leyble Dennis John
Weir John Douglas
Le Que T
Northrop Grumman Corporation
Pietragallo Gordon Alfano Bosick & Raspanti, LLP
Towner, Esq. Alan G.
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