Jeffrey A Sloan

US Patent:

56596375, Aug 19, 1997

Filed:

Jun 20, 1996

Appl. No.:

8/667275

Inventors:

Harold R. Bagley - Lafayette CO
Jeffrey A. Sloan - Costa Mesa CA
Donald W. Small - Lake Forest CA

Assignee:

Optical Corporation of America - Garden Grove CA

International Classification:

G06K 900

US Classification:

382278

Abstract:

A Vander Lugt optical correlator adapted to be mounted on a printed circuit board or other mounting means usable with or in a personal computer utilizing a monochromatic coherent polarized light source, a folded optical path with optics that perform light beam collimation and Fourier transformations, SLMs for scene and filter inputs and a CCD detector array at the correlation plane. The module may be of any selected configuration, such as, a parallelopiped, or a disc, either of which may be hollow, of solid opaque material for light paths formed therein, of a transparent media without passages, or of multiple sections for packaging shape, light path length compensation, component mounting etc. The circuit board may contain electronics required to operate all of the correlators electronic components.

US Patent:

58837434, Mar 16, 1999

Filed:

Jan 31, 1996

Appl. No.:

8/594180

Inventors:

Jeffrey A. Sloan - Costa Mesa CA

Assignee:

Corning OCA Corporation - Marlborough MA

International Classification:

G02B 2746
G03H 116
G06K 15316
G06K 936

US Classification:

359561

Abstract:

A module, capable of being mounted on a printed circuit board, containing optical components necessary for optical correlation and a unique folded light path technique for conversion from a Vander Lugt optical correlator to a joint-transform optical correlator, or visa versa, with no electronic changes required. The folded optical path permits a polarizing filter to be positioned in the beam path reflected by a filter SLM but before a correlation detector means when the correlator is in a Vander Lugt mode and permits the polarizing filter to be removed, and an auxilliary mirror or other optical components positioned in the beam path to eliminate the filter SLM and to direct the beam path toward the correlation detector means when the optical correlator is to become a two-cycle joint-transform optical correlator and simultaneously match the Fourier transform plane to the detector plane of the detector means. The polarizing filter is mounted on the module cover for ease of placement and for ease of removal, while the mirror or other optical components are mounted on another module cover for ease of placement at the required precise point in the folded optical path and ease of removal. In lieu of changing covers, the mirror and other optical components as the case may be may be moved, as by sliding, pivoting or rotating, for the conversion of the Vander Lugt correlator to the joint-transform correlator and visa versa.