High output reflective optical correlator having a folded optical axis using grayscale spatial light modulators
First Claim
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1. 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; and
a 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.
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Abstract
An optical correlator system having a plurality of both active and passive reflective optical components between a source of electromagnetic radiation, such a visible coherent light, and an output detector array in a planar support body along a folded optical axis beam path within the body uses a grayscale spatial light modulator as the input sensor and the correlating filter to provide enhanced optical detection of an unknown object at a CCD detector array.
18 Citations
2 Claims
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1. An improved optical correlator for detecting and identifying an unknown object, comprising:
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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; and a 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. - View Dependent Claims (2)
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Specification
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Current AssigneeNorthrop Grumman Systems Corporation (Northrop Grumman Corporation)
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Original AssigneeLitton Systems Incorporated
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InventorsCarrott, David T., Mallaley, Gary L.
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Primary Examiner(s)HENRY, JON W
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Application NumberUS09/126,309Time in Patent Office873 DaysField of Search359/561, 359/560, 382/210, 382/211, 382/278, 382/280, 708/816US Class Current359/561CPC Class CodesG02B 27/46 Systems using spatial filtersG06E 3/005 using electro-optical or op...
