Fast Measurement of the Twist Nematic Liquid Crystal Cell Gap
快速测量扭曲向列相液晶盒盒厚

A new method of fast measuring the twist nematic liquid crystal cell gap utilizing circular polarized light meter was proposed.The circular polarized light meter include a pair of crossed polarizer and analyzer at the front and back side,and a pair of crossed quarter wave plates in the middle of the system.The liquid crystal cell sample was inserted between the two quarter wave plates directly,and there is no need for modulating the orientation of the cell.Being different from the rotating polarizer/or liquid crystal cell method to find the maximum or minimum output intensity value,there is no need of rotating any optical elements or the liquid crystal cell for the circular polarized light meter method to measure the cell thickness of liquid crystal cell,and it is enough to measure the two intensity values in the parallel and vertical orientation.The experiment results indicated that this method is fast and effective.