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Study of the measurement for the diffusion coefficient by digital holographic interferometry

机译：数字全息干涉法测量扩散系数的研究

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In the measurement of the diffusion coefficient by digital holographic interferometry, the conformity between the experiment and the ideal physical model is lacking analysis. Two data processing methods are put forward to overcome this problem. By these methods, it is found that there is obvious asymmetry in the experiment and the asymmetry is becoming smaller with time. Besides, the initial time for diffusion cannot be treated as a constant throughout the whole experiment. This means that there is a difference between the experiment and the physical model. With these methods, the diffusion coefficient of KCl in water at 0.33 mol/L and 25 degrees C is measured. When the asymmetry is ignored, the result is 1.839 x 10(-9) m(2)/s, which is in good agreement with the data in the literature. Because the asymmetry is becoming smaller with time, the experimental data in the latter time period conforms to the ideal physical model. With this idea, a more accurate diffusion coefficient is 2.003 x 10(-9) m(2)/s, which is about 10% larger than the data in the literature. (C) 2015 Optical Society of America
机译：在通过数字全息干涉法测量扩散系数时，缺乏对实验与理想物理模型之间一致性的分析。为了克服这个问题，提出了两种数据处理方法。通过这些方法，发现实验中存在明显的不对称性，并且不对称性随着时间而变小。此外，在整个实验中，扩散的初始时间不能视为恒定值。这意味着实验和物理模型之间存在差异。使用这些方法，测量了KCl在25摄氏度和0.33 mol / L的水中的扩散系数。当不对称性被忽略时，结果为1.839 x 10（-9）m（2）/ s，这与文献中的数据非常吻合。由于不对称性随时间而变小，因此后一段时间的实验数据符合理想的物理模型。有了这个想法，更精确的扩散系数为2.003 x 10（-9）m（2）/ s，比文献中的数据大约10％。 （C）2015年美国眼镜学会

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