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This article deals with the gravitational lensing (GL) of gravitational waves(GW). We compute the increase in the number of detected GW events due to GL.First, we check that geometrical optics is valid for the GW frequency range onwhich Earth-based detectors are sensitive, and that this is also partially truefor what concerns the future space-based interferometer LISA. To infer thisresult, both the diffraction parameter and a cut-off frequency are computed.Then, the variation in the number of GW signals is estimated in the generalcase, and applied to some lens models: point mass lens and singular isothermalsphere (SIS profile). An estimation of the magnification factor has also beendone for the softened isothermal sphere and for the King profile. The resultsappear to be strongly model-dependent, but in all cases the increase in thenumber of detected GW signals is negligible. The use of time delays amongimages is also investigated.Comment: Accepted for publication in General Relativity and Gravitatio

Increase of the Number of Detectable Gravitational Waves Signals Due to Gravitational Lensing