optical dispersion meaning in English

光分散
光色散
色散

Standard test methods for refractive index and specific optical dispersion of electrical insulating liquids
电绝缘液体折射指数和比光散度的标准试验方法
From the results of these experiments , we know that the improvement effect is clear when the enhancement ratio is 1 . 5 . but the enhancement ratio of 2 . 5 is difficult to be reached because of the optical dispersion . it shows that the enhancement ratio is limited by the size of ccd sensor ' s cell and optical dispersion
而由于ccd像元尺寸与弥散斑相差不多，要想获得分辨率提高2 . 5倍的高分辨率图已经很困难，说明反演解析法实际上对分辨率的提高是有一个上限的，这和弥散斑与ccd感光像元间的大小比例有关。