Novel polariscope to extract multiple-parameter from twisted nematic liquid crystal

Tsung Chih Yu, Yu-Lung Lo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new method for measuring the multiple parameters of a twisted-nematic liquid crystal (TNLC) by applying a genetic algorithm is presented. This study adopts an electric-optic (EO) modulator to modulate the linear polarized light which passed through a TNLC cell in a heterodyne polarimetric setup. The intensity ratio and the phase of the detected heterodyne signal are used for the inverse calculation of the LC cell parameters by applying a genetic algorithm approach. As a result, the multi-parameter measurements in the entrance director angle of TNLC, twist angle, and cell thickness are achieved. The heterodyne polarimeter introduces high-sensitivity on intensity and phase detections, and the multiple parameters could be easily extracted through the genetic algorithm. The experimental results show that the average deviation of 0.0122 degree and 0.01344 μm in the measurement of twist angle and cell thickness have been obtained. The average deviation of 0.22675 degree in the measurement of director angle has also been achieved.

Original languageEnglish
Title of host publicationProceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Pages237-243
Number of pages7
Volume1
Publication statusPublished - 2006
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 - Saint Louis, MO, United States
Duration: 2006 Jun 42006 Jun 7

Other

OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
CountryUnited States
CitySaint Louis, MO
Period06-06-0406-06-07

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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