Improved methods of performing coherent optical correlation
Akram S. Husain-Abidi, United States. National Aeronautics and Space Administration, Goddard Space Flight Center
National Aeronautics and Space Administration, 1972 - Mathematics - 12 pages
Coherent optical correlators are described in which complex spatial filters are recorded by a quasi-Fourier transform method. The high-pass spatial filtering effects (due to the dynamic range of photographic films) normally encountered in Vander Lugt type complex filters are not present in this system. Experimental results for both transmittive as well as reflective objects are presented. Experiments are also performed by illuminating the object with diffused light. A correlator using paraboloidal mirror segments as the Fourier-transforming element is also described.
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a0-plane amplitude and phase amplitude information autocorrelation function bright central peak COHERENT OPTICAL CORRELATION collimate the laser collimated light complex filter complex spatial filter coplanar correlation spot cq3-plane diffuse illumination dynamic range encountered in Vander experimental arrangement field produced field transmitted filter when illuminated focal length focal plane Fourier transform FRONT SURFACE MIRROR front-surface reflecting mirror geometrical image Goddard Space Flight Greenbelt high-pass spatial filtering hologram Holography input transparency laser light Lens L4 light transmitted light was brought Lugt type complex normally encountered object transparency off-axis paraboloidal mirror oscilloscope parabolic mirror paraboloidal mirror segments Pattern Recognition PERFORMING COHERENT OPTICAL Performing Organization phase and amplitude photographic films photographic plate plate was placed point source range of photographic reference beam reflective objects sensitivity and selectivity Space Flight Center spatial filtering effects spherical waves SURFACE MIRROR Mg term in Equation transformed the field transmittive objects Upatnicks Vander Lugt type vidicon tube x^-plane xy-plane