基于数字全息干涉术的液相扩散过程可视化（英文）

Visualized Measurement of the Liquid Phase Diffusion by Using Digital Holographic Interferometry

提出了利用数字全息干涉术可视化观测液相扩散过程.实验中,采用马赫-曾德干涉仪光路记录乙醇与水之间两相扩散过程的多幅数字全息图;再通过数值再现不同扩散状态的波前相位分布,获得液体中的摩尔浓度分布;最后,根据菲克定律获得两相流扩散系数.结果表明:利用数字全息干涉术可实现对液相扩散传质过程的快速、实时及高精度测量;该方法还具有可实现远程监控、拥有大量微观数据的优点;此外,采用文中全息干涉光路结合波分与角分复用技术可实现多相流扩散系数的测量,为获得溶液中非线性变化特征参量提供了有效技术手段.

Liquid phase diffusion is a high energy consumption process in chemical production.With the rapid development of the chemical technology based on liquid phase diffusion,especially in some emerging fields such as biomedicine and environmental science,the microcosmic study on the liquid phase diffusion is becoming more and more important.By applying the digital holographic interferometry,a diffusion process in liquid phase of pure ethanol and water was observed.After recording the digital hologram by a Mach-Zehnder interferometer and reconstructing digital hologram of object beam by the gray scale analysis,the phase variation of object wavefront in the diffusion process at different times and the curves of refractive index change in the diffusion area were both acquired.The result shows that by applying the digital holographic interferometry,a fast,real time and high-accuracy diffusion can be realized.Moreover,this method can be used to realize a remote visual monitoring.In addition,this method combining with wavelength and angular multiplexing techniques can be applied to obtain nonlinear characteristics parameters in multiple-phase diffusion measurements.