用液芯柱透镜测量液体折射率  

Measuring refractive index of liquid with liquid-core cylindrical lens

作　　者：李强[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：《大学物理》2013年第1期52-56,共5页College Physics

基　　金：国家自然科学基金(11164033);云南省应用基础研究基金(2011FA006);云南省高校科技创新团队支持计划资助

摘　　要：制作了一种液芯变焦柱透镜并将其用于精确测量液体的折射率.在空心的柱透镜内注入待测折射率的液体,通过测量液芯透镜的焦距,根据焦距和折射率之间的关系,计算出液芯介质的折射率.此方法有效地提高了折射率测量的灵敏度,减小了测量系统的景深.选取×20倍显微物镜可实现液体折射率1.3～1.642范围内的精确测量,单次测量误差小于0.000 2.A liquid-core cylindrical lens is designed and fabricated, which is used to measure accurately therefractive index of liquid filled into the core region of the cylindrical lens. The focal length of such a cylindrical lens is varied with the refractive index of core liquid, which can be known by measuring experimentally the related focal length. Due to a high sensitivity in measuring refractive index and a short depth of field, a high accuracy in measurement of refractive index is ensured. The accuracy of refractive index for one single measurement is better than 0. 0002 in the range of 1.3 - 1. 642, when a×20 objective is used in a reading microscope. By either enhancing sensitivity of refractive index of the cylindrical lens or enlarging effective numerical aperture of the measurement system, we find that the accuracy of refractive index can be further improved.

关 键 词：液体折射率 测量灵敏度 液芯柱透镜 景深 

分 类 号：O439[机械工程—光学工程]