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介绍了数字全息激光干涉测量实验原理,设计并搭建扩散系数测量实验平台,运用MATLAB软件编写数字图像处理程序,利用傅里叶相位分析方法进行数字全息图分析,最后得到扩散系数解。分别测量温度为298.15 K时0.33 mol/L的KCL溶液和二氧化碳气体在水中扩散系数值并与文献研究数据进行对比,进行实验正确性验证,结果显示实验与文献标准值误差分别为1.63%和2.29%,满足实验要求。最后运用此装置测试了278.15 K-323.15 K时二氧化碳在RP-3航空燃油中的扩散系数,随着温度升高扩散系数增大,并且不同温度下扩散系数值符合阿伦尼乌兹方程。
The experimental principle of digital holographic laser interferometry is introduced. The experiment platform of measuring diffusion coefficient is designed and constructed. The digital image processing program is programmed by MATLAB software, the digital hologram is analyzed by Fourier phase analysis method, and finally the diffusion coefficient solution is obtained. The diffusivities of 0.33 mol / L KCL solution and carbon dioxide gas in water at 298.15 K were measured and compared with the literature data to verify the validity of the experiment. The results showed that the error between the experimental and literature standards was 1.63% and 2.29 %, To meet the experimental requirements. Finally, the device was used to test the diffusion coefficient of carbon dioxide in RP-3 aviation fuel at 278.15 K-323.15 K. As the temperature increased, the diffusion coefficient increased, and the diffusion coefficient at different temperatures was in accordance with the Arrhenius equation.