Sun Peng, Zhong Liyun, Luo Chunshu, Niu Wenhu, Lu Xiaoxu
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510006, China.
Sci Rep. 2015 Jul 16;5:12053. doi: 10.1038/srep12053.
To perform the visual measurement of the evaporation process of a sessile droplet, a dual-channel simultaneous phase-shifting interferometry (DCSPSI) method is proposed. Based on polarization components to simultaneously generate a pair of orthogonal interferograms with the phase shifts of π/2, the real-time phase of a dynamic process can be retrieved with two-step phase-shifting algorithm. Using this proposed DCSPSI system, the transient mass (TM) of the evaporation process of a sessile droplet with different initial mass were presented through measuring the real-time 3D shape of a droplet. Moreover, the mass flux density (MFD) of the evaporating droplet and its regional distribution were also calculated and analyzed. The experimental results show that the proposed DCSPSI will supply a visual, accurate, noncontact, nondestructive, global tool for the real-time multi-parameter measurement of the droplet evaporation.
为了对静态液滴的蒸发过程进行可视化测量，提出了一种双通道同步相移干涉测量法（DCSPSI）。基于偏振分量，同时生成一对具有π/2相移的正交干涉图，利用两步相移算法可以获取动态过程的实时相位。利用所提出的DCSPSI系统，通过测量不同初始质量静态液滴蒸发过程的实时三维形状，给出了其瞬态质量（TM）。此外，还计算并分析了蒸发液滴的质量通量密度（MFD）及其区域分布。实验结果表明，所提出的DCSPSI将为液滴蒸发的实时多参数测量提供一种可视化、准确、非接触、无损的全局工具。
