We propose new instrumentation to measure the refractive index (RI) of transparent liquids as a function of temperature. The physical phenomenon used to carry out the measurement is the light refraction that occurs in transparent liquids. A width change in a reference object is produced by light refraction, which is related to the RI. Image processing was used to measure the object width using an image from a digital microscope. The instrument measures the RI from a range of 15°C to 100°C with an accuracy of 10 − 4 % . The measurement procedure was calibrated with distilled water and acetonitrile samples, and the Sellmeier and Cauchy equation was used to compare our results. Finally, as an appropriate application, the RI of lophine in a solution was measured.

中文翻译：

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光折射仪，用于测量透明液体的折射率

我们提出了一种新的仪器来测量透明液体的折射率（RI）与温度的关系。用于执行测量的物理现象是在透明液体中发生的光折射。参考物体的宽度变化是由与RI有关的光折射产生的。使用来自数字显微镜的图像，通过图像处理来测量物体的宽度。该仪器可在15°C至100°C的范围内测量RI，准确度为10-4％。测量程序用蒸馏水和乙腈样品校准，并使用Sellmeier和Cauchy方程比较我们的结果。最后，作为适当的应用，测量了溶液中丝氨酸的RI。