Optics: measuring and testing – By polarized light examination – With polariscopes
Reexamination Certificate
2007-03-27
2007-03-27
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By polarized light examination
With polariscopes
C356S369000
Reexamination Certificate
active
10684361
ABSTRACT:
A liquid crystal based polarimetric system, a process for the calibration of this polarimetric system, and a polarimetric measurement process intended for measuring the representative parameters of a sample in which the polarimetric system contains an excitation section emitting a light beam that passes through a polarization state generator (PSG) and onto a sample. After reflection or transmission by the sample, the beam goes through an analysis section with a polarization state detector (PSD). The PSG and PSD each have a first and a second liquid crystal elements LCj(j=1,2) having, for each LCjelement of the PSG (respectively for each LCjelement of the PSD), an extraordinary axis making an angle θj(resp. θ′j) with respect to the polarization direction (i), and a retardation δj(resp (δ′j) between its ordinary and extraordinary axes, the liquid crystals LCjelements being positioned in reverse order in the PSD with respect to the LCjelements of the PSG.
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De Martino Antonello
Drevillon Bernard
Centre National de la Recherche Scientifique "CNRS"
Ecole Polytechnique
Punnoose Roy M.
Toatley , Jr. Gregory J.
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