光学学报, 2009, 29 (9): 2468, 网络出版: 2009-10-09   

用毛细管焦点法精确测量微量液体的折射率

Measuring Refractive Index of Micro-Quantity Liquid by Focus Method
作者单位
云南大学物理科学技术学院物理系, 云南 昆明 650091
摘要
介绍了用毛细管焦点法精确测量微量液体折射率的一种新技术。该技术基于共轴球面光学系统的成像原理,用LED(λ=580 nm,FWHM为32 nm)为测量光源,用CCD为像接收装置,一次测量样品需要量小于0.002 mL。待测样品封闭在毛细管内测量,有利于对毒性、挥发性和吸湿性强的液体介质折射率的测量。用此技术对纯水、乙醇、乙二醇和丙三醇样品的折射率做了测量,测量精度分别为0.0001,0.0002,0.0003和0.0003。论文在分析实验装置的测量灵敏度和成像景深基础上,提出了进一步提高测量精度的方法。
Abstract
A new method for measuring the refractive index of micro-quantity liquid based on imaging principle of a coaxial spherical surface optical system is introduced. LED (λ=580 nm,FWHM: 32 nm) is used as light source and CCD camera as the equipment of receiving image. The required sample is less than 0.002 mL. The liquid to be measured is closed in a glass capillary, so that is benefited to measure the poisonous, volatile and absorptive liquid samples. Four liquid mediums, water, ethanol, ethylene glycol and glycerin have been measured, and the precision of obtained refractive index is 0.0001, 0.0002, 0.0003 and 0.0003, respectively. Based on an analysis on the sensitivity of refractive index and the depth of field of the measurement system, the ways to improve the measurement precision are proposed.

李强, 韩广辉, 邢曼男, 普小云. 用毛细管焦点法精确测量微量液体的折射率[J]. 光学学报, 2009, 29(9): 2468. Li Qiang, Han Guanghui, Xing Mannan, Pu Xiaoyun. Measuring Refractive Index of Micro-Quantity Liquid by Focus Method[J]. Acta Optica Sinica, 2009, 29(9): 2468.

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