A transform optical processing system

A Fourier transform optical processing method and system suitable for production line checking in which an electrical signal is generated by generator (2) in response to a first image and a beam (5) of coherent light is modulated by modulator (6) controlled by the electrical signal; a Fourier transf...

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Bibliographische Detailangaben
Hauptverfasser:	CASASENT, DAVID PAUL, MERCURIO, GREGORY SCOTT, LIVNY, IZHAK MOSHE, HEKKER, ROELAND MICHAEL THEODORUS, FRANKE, MARC ANTHONY
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CALCULATING COMPUTING COUNTING DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY FREQUENCY-CHANGING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL COMPUTING DEVICES OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS SEMICONDUCTOR DEVICES TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TESTING
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Beschreibung
Zusammenfassung:	A Fourier transform optical processing method and system suitable for production line checking in which an electrical signal is generated by generator (2) in response to a first image and a beam (5) of coherent light is modulated by modulator (6) controlled by the electrical signal; a Fourier transform image (7) of the modulated coherent light beam is formed, and then detected by detector (8). The detector (8) provides a second electrical signal representative of the Fourier transformed image. Other aspects of the invention include comparing the second electrical signal to a reference electrical signal for producing an output signal representing any differences; optically preprocessing the image; detecting the Fourier transform image and generating signals representative of its Fourier transform characteristics; and modulating a coherent light beam using a liquid crystal or other spatial light modulating device.