Abstract
A simple method is described for measurement of wavelength and decay of travelling waves on the surface of transparent liquids. Light transmitted through a fixed line grating is deviated by the wave-carrying surface, producing a distorted image of the grating. The moire fringes produced by projection of this optically distorted grating onto a second stationary grating permit visualisation and measurement of the waves as they travel across the surface. The wave slope can be measured at all points on the wave system, enabling decay to be calculated. The method is used to examine the effect of small additions of a polymer on surface wave properties.
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