EP 0058592 B1 19850710 - OPTICAL FOURIER TRANSFORM DEVICE AND OPTICAL CORRELATOR USING THE SAME
Title (en)
OPTICAL FOURIER TRANSFORM DEVICE AND OPTICAL CORRELATOR USING THE SAME
Publication
Application
Priority
FR 8102410 A 19810206
Abstract (en)
[origin: US4514038A] This optical Fourier transformer device supplying the correlation function of two motifs of an object illuminated in coherent light by using the double diffraction principle is essentially characterized in that it generates a complex wave conjugate of a wave modulated by the object propagating in the opposite direction to the latter. This conjugate wave is produced by double diffraction in an interaction medium and compensates the distortions induced by the optical components of the system. The optical correlator system utilizing this Fourier transformer is essentially characterized in that it uses a recyclable material as the recording medium. A reading beam is subject to an angular scan making it possible to optimize the diffraction efficiency of this medium. The beam modulated by the object and the reading beam are synchronously deflected to improve the signal to noise ratio in the output plane.
IPC 1-7
IPC 8 full level
G02B 27/46 (2006.01); G06E 3/00 (2006.01)
CPC (source: EP US)
G06E 3/003 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB NL
DOCDB simple family (publication)
EP 0058592 A1 19820825; EP 0058592 B1 19850710; DE 3264603 D1 19850814; FR 2499735 A1 19820813; FR 2499735 B1 19850208; JP S57148720 A 19820914; US 4514038 A 19850430
DOCDB simple family (application)
EP 82400164 A 19820128; DE 3264603 T 19820128; FR 8102410 A 19810206; JP 1807882 A 19820205; US 34501882 A 19820202