Abstract
For measurements of viscoelastic properties of monolayers spread on liquids the use of longitudinal surface waves is discussed. The conventional theory is somewhat modified; use is made of the telegraph equations analogous to descriptions of other wave propagation phenomena. It is shown that measurements of the surface tension alone can result in a high degree of inaccuracy of the values of the wave parameters. Part of this is caused by ignoring the imperfect transfer mechanism of the barrier movement to the surface. The inaccuracies can be lessened considerably by measuring the surface velocity simultaneously with the surface tension. As an illustration, measurements on cholesterol, a component of lung surfactant, are reported. The wave parameters are evaluated from the experimental results both with and without consideration of the surface velocity.
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