The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 1991
Filed:
Mar. 30, 1990
Applicant:
Inventors:
Joseph L Horner, Belmont, MA (US);
Charles K Makekau, Bedford, MA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359561 ; 364827 ; 382 42 ;
Abstract
A 2f Fourier transform optical correlator uses two simple, single element lenses, with the second lens performing both quadratic phase term removal and the inverse Fourier transform operation in a compact two-focal-length space. This correlator performs correlations quite well and uses three less lens elements than a prior 2f system, is shorter by a factor of two compared to the standard 4f system, and uses one less lens than the 3f system, while still retaining the variable scale feature.