Acoustic Hologram Reconstructor Using Surface Acoustic Wave Devices.
DEPARTMENT OF THE NAVY WASHINGTON D C
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This invention relates to an acoustical hologram reconstructor using surface acoustic wave SAW devices, which is a major part of apparatus which converts an acoustical hologram into a focused optical image, both having a magnitude and phase. The focused image is ultimately converted to an optical image having intensity variations, which can be viewed on a TV monitor. Two parallel convolvers, implemented by surface wave devices, are required to achieve the necessary speed of signal processing. One convolver loads while the other calculates, and vice versa. Circuitry is included to perform the following three functions required to reconstruct an intensity pattern 1 multiplication of the hologram data by a focusing correction term 2 performance of the inverse Fourier transform and 3 squaring and summing the real and imaginary components. Author