Birefringence measurement of polymeric films and the like

Details Birefringence measurement of polymeric films and the like Birefringence measurement of polymeric films and the like

2008-06-10

2008-06-10

Punnoose, Roy M (Department: 2886)

Optics: measuring and testing

By polarized light examination

With birefringent element

C356S364000

Reexamination Certificate

active

07385696

ABSTRACT:
Provided are methods for determining the birefringence level of optical material such as polymeric film. In one embodiment, the method uses a setup of optical components that has known system reference angle. The sample may be a stretched polymeric film that has a fast axis angle that has a predetermined orientation in the sample. The system is operated to align the direction of the fast axis of the sample with the reference angle of the system and to measure the birefringence level at a location of the sample. As one aspect of the invention, embodiments and methods are described for accurately determining birefringence levels across a very wide range and up to tens of thousands of nanometers.

REFERENCES:
patent: 5521705 (1996-05-01), Oldenbourg et al.
patent: 6473179 (2002-10-01), Wang
patent: 6985227 (2006-01-01), Wang
patent: 2004/0233434 (2004-11-01), Wang

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