Determination of layer thickness or non-uniformity of layer...

Details Determination of layer thickness or non-uniformity of layer... Determination of layer thickness or non-uniformity of layer...

2005-11-08

2005-11-08

McDowell, Suzanne E. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating luminescent material

C264S040100, C264S040600, C264S454000, C264S464000, C264S478000

Reexamination Certificate

active

06962670

ABSTRACT:
The invention provides a method for measuring the thickness, or non-uniformity of thickness, of one or more layers of a film or article such as a preform. At least one layer contains a known concentration and a substantially uniform distribution of fluorophores. The fluorophores are added to the one or more layers in sufficient quantity to impart fluorescence capable of detection by a detector when exposed to electromagnetic radiation at absorbing wavelengths. The layers of the invention may be made from polymeric material, non-polymeric material, or combinations thereof.

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