电流变液的旋光与椭偏光行为

本文研究了电流变液(ER流体)的旋光行为及椭偏光行为.激光束垂直于电场方向,利用HeNe激光器对SiO₂、Si₃N₄和硅油组成的ER流体进行测量.发现电流变液样品存在旋光现象,且对于同一种浓度的ER流体,随着电场强度的增大,旋光角度增大.在同一电场强度下,旋光角度随着浓度的增大而增大.当浓度大于某一值c₀时,旋光角度开始减小,在不同电场强度下,透过电流变液的椭圆偏振光性质不发生改变,且随着电场强度的增大,透射光强度随之增大.电流变液的旋光行为及椭偏光行为起因于在电场作用下ER流体由各向同性的液体转变为各向异性的液体.

THE BEHAVIOR OF OPTICAL ROTATION AND ELLIPTICAL POLARIZATION LIGHT OF ELECTRORHEOGICAL FLUIDS

In this paper,the behaviors of optical rotation and elliptical polarization light of electrorheological fluids (ER Fluids) were investigated.The measurements have been made of He Ne laser through suspensions of SiO 2 and Si 3N 4 in silicone oil.When electric field was applied perpendicular to the laser beam the optical rotation phenomenon of ER fluid was found .For the same concentration of ER fluids,the optical rotation angle inereases with the electric field.In the effect of the same electric field when the concentration is lower ,the optical rotation angle increases with the concentration.And when the concentration reaches the given value of c 0 ,the optical rotation angle decreases with the increase of the concentration.In the effect of the electric field the characteristics of elliptical polarization light which penetrates ER fluid does not change,and the transmission light intensity increases with the electric field.It is thought that the behavior of optical rotation and elliptical polarization light of ER fluids is due to the fact that ER fluid changes from isotropic fluid to anisotropic fluid in the effect of electric field.