We discuss the application of the three-laser optical digital interferometry method for the determination of transport properties such as the thermodiffusion, the molecular diffusion and the Soret coefficients by the thermogravitational column technique. The primary objective of this study is to illustrate the capabilities and limitations of the method for quantifying these properties in both binary and ternary liquid mixtures from an optical viewpoint. It is concluded that the system is highly robust for the analysis of binary mixtures, with the combination of the results obtained by the three wavelengths increasing the accuracy of the measurement. The study of ternary mixtures, on the contrary, is limited to certain types of conditions. While the accuracy of a three-laser interferometer can be improved, the method may be compromised if the optical contrast factor matrices are poorly conditioned.

中文翻译：

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三激光光学数字干涉仪在二元和三元混合物热重分析中的应用


我们讨论了三激光光学数字干涉测量方法在通过热引力柱技术测定热扩散、分子扩散和Soret系数等输运特性中的应用。本研究的主要目的是从光学角度说明量化二元和三元液体混合物中这些特性的方法的能力和局限性。结论是，该系统对于二元混合物的分析具有高度鲁棒性，三个波长获得的结果的组合提高了测量的准确性。相反，三元混合物的研究仅限于某些类型的条件。虽然三激光干涉仪的精度可以提高，但如果光学对比度因子矩阵条件不佳，该方法可能会受到影响。