Abstract

A noncontact optical method for measuring the wavelength of capillary ripples on a liquid–liquid interface is proposed and demonstrated. The dispersion relationship for the aforementioned capillary waves is derived, relating the wavelength to the interfacial tension. Measurements of the wavelength, and thus the interfacial tension, are presented. Temporal measurements of the change in wavelength in response to an applied voltage (electrocapillarity) are presented and an upper limit is presented for any spatial variation of the wavelength on the interface.

© 1985 Optical Society of America

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