The meniscus of liquid-air interfaces is studied by holographic interferometry. In non diffuse reflected light the technique yields interference fringes from which the surface shape is calculated. When the method is employed to a meniscus of well known theoretical shape the coefficient of capillarity is obtained by a fit to the experimental data. In the present study the water meniscus adjacent to a vertical wall is investigated. A special holographic setup incorporating a Michelson interferometer and producing a real image of the phase distribution above the liquid surface minimises aberrations and allows to account for them quantitatively. Thus values of the coefficient of surface tension are obtained with an accuracy of 1°/oo and better.
"Measurement Of Surface Tension By Holographic Interferometry", Proc. SPIE 0210, 2nd European Congress on Optics Applied to Metrology, (20 May 1980); doi: 10.1117/12.958331; https://doi.org/10.1117/12.958331