Abstract
In the present paper, we suggest a device that is able to produce circularly polarized ultrasonic waves by transposing the optical arrangement known as Fresnel's parallelepiped into the acoustic domain. A plane elastic transverse wave is propagated in an isotropic solid medium and then reflected at a plane air-solid interface. This wave is linearly polarized at 45° to the plane of incidence and so results in two components of equal amplitude, which are in phase. After reflection at an appropriate angle, the two transverse waves are in phase quadrature and the reflected wave is circularly polarized. This result is essentially independent of frequency.
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