In-situ holographic characterization of thin liquid film thickness evolution during boundary-constrained motion

Digital holography, a remarkably effective tool for in-situ measurements of thin liquid film thickness, was employed to investigate the evolution of a vertically moving soapy water film under boundary constraints. Our comprehensive experiments, conducted across four distinct pumping rates, unveiled the intricate process of central thinning and accurately measured its expansion rate through a rigorous spatiotemporal analysis. To address the complexities of asymmetric flow motion, we developed a novel diagonal spatiotemporal analysis strategy, to our knowledge, that significantly enhanced the precision and accuracy of our findings.