Patent ID: 6163403
Filing Date: 2000-12-19
Classification: G02B,G06E

Abstract:
An improved optical correlator for detecting and identifying an unknown object, comprising:a first grayscale spatial light modulator (SLM) for receiving pre-processed image data of the unknown object and patterning an electromagnetic beam according to the image data of the unknown object;a first toric mirror for performing a first Fourier transformation on the electromagnetic beam from the first SLM;a second grayscale spatial light modulator (SLM) for receiving a pre-processed Fourier transformation pattern of a known object and patterning the electromagnetic beam from the first toric mirror according to the Fourier transformation pattern of the known object;a second toric mirror for performing a second Fourier transformation on the electromagnetic beam from the second SLM;a charge coupled device (CCD);a reflective surface for converging the electromagnetic beam from the second toric mirror onto the CCD; anda third toric mirror positioned in the electromagnetic beam path between the reflective surface and the CCD for converging the electromagnetic beam from the reflective surface onto the CCD.