Ewings R A, Kischka C, Parry-Jones L A, Elston S J
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Jan;73(1 Pt 1):011713. doi: 10.1103/PhysRevE.73.011713. Epub 2006 Jan 31.
A technique for measuring the difference between the splay and bend flexoelectric coefficients in a nematic liquid crystal is demonstrated. The method uses the flexoelectric-optic effect, but instead of a uniform lying helix structure, a TN cell geometry with an in-plane electric field is used. This has the advantage of avoiding difficulties associated with aligning the helix and can be used to measure achiral materials. The effects due to ionic screening are also taken into account.
展示了一种测量向列型液晶中展曲和弯曲挠曲电系数差异的技术。该方法利用挠曲电 - 光学效应，但不是使用均匀排列的螺旋结构，而是采用具有面内电场的扭曲向列（TN）盒几何结构。这具有避免与螺旋排列相关困难的优点，并且可用于测量非手性材料。还考虑了离子屏蔽的影响。
