光子学报, 2009, 38 (3): 699, 网络出版: 2010-07-16
LFI法测量半透明油的折射率
Measurement of Refractive Indices of Semi-transparent Oils Using LFI Method
摘要
LFI方法曾被用来测量大直径光纤的折射率.用一半盛油一半为空气的毛细管代替光纤,并用聚焦的条形光束照射毛细管,空气与油的干涉条纹同时产生.根据空气的条纹可以确定参数b,根据一组已知折射率的标准样品可确定另一参数c,同时可以建立标准液体最外条纹的偏折角与折射率的标准曲线.对于未知折射率的样品,一旦测量出其最外条纹的偏折角,从标准曲线上就可以读出其折射率.实测了一组半透明油的折射率,其结果与阿贝折射仪测量结果接近.
Abstract
Lens fiber interference(LFI) method was used to measure refractive indices of fiber with big radius. A capillary tube, half filled liquid and half air, replaced fiber and was illuminated by focused laser sheet of light. Interferograms of liquid and air were produced at the same time. By the fringe of air, a parameter b was determined. And by the interference fringe patterns of a set of standard samples, anther parameter c was determined. A curve between the refractive indices and the deviation angles of the external fringes of the standard liquids was established. For the sample unknown refractive index, once the deviation angle of the external fringe was measured, the refractive index could be read from the standard curve. Using this method, the refractive indices of a set of semi-transparent oils were measured. The results are approximate to that of Abbe refractometer.
杨爱玲, 张金亮, 唐明明, 孙步龙. LFI法测量半透明油的折射率[J]. 光子学报, 2009, 38(3): 699. YANG Ai-ling, ZHANG Jin-liang, TANG Ming-ming, SUN Bu-long. Measurement of Refractive Indices of Semi-transparent Oils Using LFI Method[J]. ACTA PHOTONICA SINICA, 2009, 38(3): 699.