精确测量微量液体折射率的新方法  

Novel measuring method for refractive index of micro-quantity liquid

作　　者：邢曼男[1] 白然[1] 普小云[1] 

机构地区：[1]云南大学物理科学技术学院物理系,云南昆明650091

出　　处：《光学精密工程》2008年第7期1196-1202,共7页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.10564005)

摘　　要：介绍了一种用玻璃毛细管精确测量微量液体折射率的新方法。该方法基于共轴球面光学系统的成像原理,通过读数显微镜对吸入待测液体后毛细管的焦点位置进行单一参数的测量,进而计算出待测液体的折射率。用此方法测量了纯水、乙醇、乙二醇、丙三醇的折射率,各种待测样品的需要量<0.002 ml;测量结果表明,纯水和乙醇样品的折射率测量精度优于0.0003;乙二醇和丙三醇样品的折射率测量精度优于0.0007。选用适当的毛细管参数,可以进一步提高这种测量方法的测量精度,扩展折射率的测量范围。分析和讨论了实验测量误差以及进一步提高测量精度的方法。该方法具有待测液体用量极少、使用设备简单、操作方便和折射率测量精度高的特点。On the basis of imaging principle of a coaxial spherical surface optical system,a new measuring method using glass capillary for the the refractive index of micro-quantity liquid was introduced. The refractive index was obtained through measuring the focal position of a capillary filled with the liquid by a reading microscope, and doing a calculation with an analytic formula. The refractive indexes of four liquid mediums, water, ethanol, ethylene glycol and glycerin were measured, the required sample was less than 0. 002 ml, the precisions of obtained refractive indexes were better than 0.000 3 for water and ethanol, and 0. 000 7 for ethylene glycol and glycerin. The results show that the new measuring method can be characterized by a micro-quantity sample, and has advantages in simple equipment, easy operation and high measurement accuracy. It is adapted to measure the refractive index of transparent or translucent micro-quantity liquid sample.

关 键 词：微量液体 折射率测量 玻璃毛细管 读数显微镜 

分 类 号：TB96[机械工程—光学工程] TH741.4[一般工业技术—计量学]