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Fast determination method of cell thickness and time-dependent twist angle in twisted-nematic liquid-crystal cells

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3 Author(s)
Honma, M. ; Department of Electronics and Information Systems, Akita Prefectural University, 84-4 Tsuchiya-Ebinokuchi, Honjo, Akita 015-0055, Japan ; Nose, T. ; Sato, Susumu

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We propose a determination method of a cell thickness d and a time-dependent twist angle Φt in a twisted-nematic liquid-crystal (TN-LC) cell using circularly and homogeneously aligned LC cells and multiple wavelengths of incident light. Influences of a spectrum distribution on determining Φt and d are theoretically discussed, compared with a monochromatic laser light source. It is found that the influence of the spectrum distribution becomes stronger with an increase in the thickness of TN-LC cells. We propose a compensation method of the influence of the spectrum width in order to accurately determine Φt and d of TN-LC cells. Results of the determination of Φt and d of two TN-LC cells are presented, and the availability of the proposed determination method using three interference filters is confirmed experimentally.

Published in:

Review of Scientific Instruments  (Volume:77 ,  Issue: 4 )

Date of Publication:

Apr 2006

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