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

Tsung Chih Yu, Yu-Lung Lo

研究成果: Conference contribution

摘要

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.

原文English
主出版物標題Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
頁面237-243
頁數7
1
出版狀態Published - 2006
事件SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 - Saint Louis, MO, United States
持續時間: 2006 6月 42006 6月 7

Other

OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
國家/地區United States
城市Saint Louis, MO
期間06-06-0406-06-07

All Science Journal Classification (ASJC) codes

  • 工程 (全部)

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