Acoustoelectric device for reading or processing a two-dimensional optical image
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The device comprises a piezoelectric medium associated with a semiconducting and photosensitive medium on which the optical image is projected. Four transducers placed on the piezoelectric medium emit four elastic waves in two distinct directions with wave numbers such that the signal resulting from the interaction of these waves has a zero wave number. Depending on the waveform of the signals applied to the transducers, it is possible to obtain either point-by-point reading of the image or the Fourier transform of said image.