Near infrared light diffuser

Details Near infrared light diffuser Near infrared light diffuser

2006-12-05

2008-12-23

Porta, David P (Department: 2884)

Radiant energy

Luminophor irradiation

Reexamination Certificate

active

07468519

ABSTRACT:
A system and method for measuring coating thickness upon a substrate is disclosed. A near infrared light is directed upon the coating and reflected near infrated light is collected to determine the coating thickness. A diffuser is placed between the coating and the reflected near infrared light collector to improve the accuracy of the measurement, especially for coating thickness of less than about 2 mils and for coatings with shiny surfaces. The diffuser is formed of a low density polytetrafluoroethylene fluoropolymer film.

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