中文摘要：

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.

英文摘要：

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.