3D morphology measurement method for droplets evaporation process based on LED off-axis digital holography

doi:10.16085/j.issn.1000-6613.2024-1725

Abstract

Abstract:

Addressing the issues of insufficient reduction accuracy and susceptibility to noise interference in current 3D morphology measurement methods for droplet evaporation processes, this paper presented an LED off-axis digital holography system utilizing the Linnik interference method. The optical system employed an LED light source combined with reference light attenuation technology to enhance the system's performance and reduce coherent noise. Algorithmically, a dual-exposure method in conjunction with a weighted least squares phase unwrapping algorithm was adopted to correct phase distortions and mitigate coherent noise, thereby improving imaging quality. Utilizing this system, the evaporation process of microscale anhydrous ethanol droplets on a vertical glass surface was investigated, achieving 3D morphology restoration and dynamic contact angle measurement during droplet evaporation. The results indicated that the droplet contact angle exhibited asymmetry in different directions, with significant differences observed particularly at a 45° angle to the direction of gravity. During evaporation, factors such as gravity and uneven surface properties influenced droplet evaporation behavior, resulting in differential evaporation rates across different directions. The research work presented in this paper provided a novel method for dynamic measurement of 3D morphologies of microscale droplets, offering potential significant support for research in the fluid interface science and related fields.

Key words: droplets, evaporation, digital holography, morphology measurement, contact angle

摘要：

针对当前液滴蒸发过程三维形貌测量方法存在的还原精度不足、易受噪声干扰等问题，本文采用Linnik干涉法搭建了一套LED离轴数字全息系统，在光学系统中采用LED光源结合参考光衰减技术以提高光学系统降低相干噪声的性能，算法上采用双曝光法结合加权最小二乘相位解包裹算法矫正相位畸变并减弱相干噪声，提高成像质量。利用该系统研究竖直玻璃表面微尺度无水乙醇液滴的蒸发过程，实现了液滴蒸发过程中的三维形貌还原和动态接触角测量。结果表明，液滴接触角在不同方向上表现出不对称性，尤其在与重力方向成45°角的方向上差异显著；在蒸发过程中重力、表面性质不均匀等均会影响液滴蒸发行为，液滴在不同方向上的蒸发速率具有差异性。本文的研究工作为微尺度液滴三维形貌的动态测量提供了新方法，有望为流体界面科学等领域的研究工作提供重要支持。

关键词: 液滴, 蒸发, 数字全息, 形貌测量, 接触角

CLC Number:

TP391

WANG Yan, FENG Zhi, ZHANG Zhengyang, WU Hao, ZHANG Wenyu, YANG Lulu, ZHANG Wenshuo, YU Qinqin, LIU Wei, WANG Jinqing, KONG Ming. 3D morphology measurement method for droplets evaporation process based on LED off-axis digital holography[J]. Chemical Industry and Engineering Progress, 2025, 44(4): 1867-1875.

王艳, 冯致, 张正阳, 吴昊, 张文宇, 杨露露, 张文硕, 禹芹芹, 刘维, 王进卿, 孔明. 基于LED离轴数字全息的液滴蒸发过程三维形貌测量方法[J]. 化工进展, 2025, 44(4): 1867-1875.

Figures/Tables 7

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