Acoustic hologram generation with high linearity - uses surface waves on liq. modulated at frequency resonating with spatial information frequency

摘要

A method is used for the production of an acoustic hologram of an object by the liquid surface relief method. The amplitudes of the object and/or the reference sound wave beam are periodically modulated at a frequency resonating with the natural frequency of the surface waveform appropriate to the spatial frequency responsible for the transmission of the object information. The system gives an enhanced deformation of the surface of the liquid with an improved linearity of its function. The two sound beams are propagated from point sources (80, 83).