Fourier-transform holography by pseudo-random phase shifting

Details Fourier-transform holography by pseudo-random phase shifting Fourier-transform holography by pseudo-random phase shifting

1975-07-31

1977-07-26

Stern, Ronald J.

350162SF, G03H 116, G03H 132

Patent

active

040379183

ABSTRACT:
A phase mask comprised of a rectangular array of phase shifting areas arranged in a pseudo-random pattern is illuminated with a beam of electromagnetic radiation. The array of pseudo-randomly phase shifted beams is focused on a Fourier transform plane on which the power spectrum of the beams distributes in two orthogonal directions from its center maxima. The phase shifting areas are arranged in such a manner that there is an approximately equal number of phase shifts for each of the different phase shifting areas with a constant phase relation between orthogonally adjacent phase shifting areas. The center maxima of the spectrum is confined to a rectangular-shaped area and uniformly distributed by suitably selecting the number of different phase shifts. Coherent noise on the reconstructed image is effectively eliminated.

REFERENCES:
patent: 3604778 (1971-09-01), Burckhardt
patent: 3744871 (1973-07-01), Takeda et al.
patent: 3829193 (1974-08-01), Tsunoda et al.
patent: 3838904 (1974-10-01), Takeda et al.
patent: 3917380 (1975-11-01), Kato et al.

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