Method of and apparatus for measuring retardation of composite l

Details Method of and apparatus for measuring retardation of composite l Method of and apparatus for measuring retardation of composite l

1995-09-26

1997-05-06

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

356367, G01N 2121

Patent

active

056276451

ABSTRACT:
A compensation polarizing plate which is superior in polarization characteristic to a polarizing filter layer of a composite layer sample is arranged on the polarization filter layer side of the composite layer sample whose polarizing filter layer has an insufficient degree of polarization, and polarization transmission axes of the polarizing filter layer and the compensation polarizing plate are kept in parallel with each other to compensate the polarization characteristics of the polarization filter layer. Measurement for obtaining the retardation value and the optical principal axis direction of the sample is carried out in the state of the compensated sample.

REFERENCES:
patent: 2244362 (1941-06-01), Hartig
patent: 3724952 (1973-04-01), Vossberg
patent: 4850710 (1989-07-01), Mochida et al.
patent: 4973163 (1990-11-01), Sakai et al.
patent: 5005977 (1991-04-01), Tomoff

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