基于分光棱镜干涉法测量透明液体折射率

Refraction Index Measurement of Transparent Liquid by Single-Element Interferometer

折射率是研究液体激光热效应必不可少的参数。干涉法是测量折射率的常用方法,但传统干涉仪稳定性较差,针对这点提出了一种基于分光棱镜干涉的单元件干涉光路并将其用于测量透明液体折射率。这种方法使用光学元件少、稳定性强且操作简单,运用CCD作为观测分析工具,测量精度能够达到10-4量级,为探索新型液体的折射率提供了一种有效手段。讨论了测量的基本原理并给出样品的测量结果,同时对实验方法的误差进行了分析。比较了迈克耳孙干涉光路和单元件干涉光路的稳定性,实验结果表明单元件干涉光路的稳定性较好。

Refraction index is one of the most important parameters in investigating the thermal effect of liquid laser. Interferometer technique is one of the most common types of the refraction index measurement, but it is sensitive to disturbances. An experimental method for the refraction index measurement of transparent liquid is presented, based on the single-element interferometer. The interference pattern is captured by a CCD camera. The method is simple as well as stable, which can be easily interpreted geometrically. The accuracy of the refractive index measurement is of the order of 10 4. Compared to the Michelson interferometer, it replies that the stability of the single-element interferometer is better than the typical interferometer＇s.