Yaralıoğlu, Göksen GökseninAtalar, AbdullahKöymen, Hayrettin2016-02-082016-02-0819950-7803-2940-61051-0117http://hdl.handle.net/11693/27757Date of Conference: 7-10 November 1995Conference Name: 1995 IEEE Ultrasonics SymposiumThe Lamb wave and V-groove lenses are distinguished by their high surface wave excitation efficiencies. However, due to the fixed incidence angle, a particular lens can only be used for materials having surface wave velocities within a limited range. Hence, it is desirable to have lenses with adjustable incidence angle. Conventional spherical lenses implemented in Fresnel planar lens form have been demonstrated earlier. In this work, Lamb wave and V-groove lenses constructed as Fresnel lenses are presented. We also discuss the feasibility of Fresnel lenses with air as the coupling medium. It is shown that it is possible to build air coupled Fresnel lenses with a reasonable conversion efficiency into subsurface waves.EnglishGeometrySurface wavesSurfacesUltrasonic transducersAcoustic wavelengthFresnel lamb wave lensV groove lensesLensesConference Paper10.1109/ULTSYM.1995.495703