Several kinds of er fluids with different concentration are prepared and their optical activity are measured with the changes of applied electric field and using a automatic polarimeter . experiments indicate that when none of the external electric field e , concentration c and 9 are equal to zero , er fluids appear optical activity . for a given concentration , optical rotation angle increases with electric field and concentration 实验发现:无外电场作用时，微乳液没有旋光效应;当e > o且浓度c和0均不为零时，出现旋光效应且旋光角大小随电场增加而增加;存在一个饱和电场值es ，当大于es时，旋光角平趋于一定值。
