Fourier transform holography using pseudo-random phase shifting

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

1976-01-26

1977-03-22

Stern, Ronald J.

350162SF, 350314, G03H 116

Patent

active

040133389

ABSTRACT:
A phase mask comprised of a square array of phase shifting areas arranged in pseudo-random pattern is illuminated with a beam of electromagnetic radiation, as a result of which an array of pseudo-randomly phase shifted beams emerges from the phase mask and impinges upon an object transparency to be intensity-modulated thereby and come to a focus on a Fourier transform plane. The power spectrum of the beams distributes in orthogonal directions on the Fourier transform plane from its center maxima in a distinct pattern of series of fringes. The technique of apodization is employed to suppress the fringes to thereby reduce the coherent noise of a hologram to a minimum.

REFERENCES:
patent: 3604778 (1971-09-01), Burckhardt
patent: 3716286 (1973-02-01), St. John
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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