Optical: systems and elements – Diffraction – Using fourier transform spatial filtering
Patent
1993-09-14
1996-01-16
Healy, Brian
Optical: systems and elements
Diffraction
Using fourier transform spatial filtering
359 29, 359559, 359560, 382210, 382280, 356 71, G02B 2746, G06K 976, G06K 974
Patent
active
054853125
ABSTRACT:
A method of verifying the authenticity of an object is disclosed preferrably employing a joint transform coherent optical processor. An unreadable and hence non-counterfeitable phase mask is coupled to the object and the optical processor compares the phase mask with a reference phase mask having the same phase code thereon. The processor produces a correlation spot having an intensity which exceeds a given level if the phase mask is genuine. A highly secure ID or credit card also carries a fingerprint bonded to the phase mask, and the fingerprint on the card is compared to a reference fingerprint of the card holder for added security.
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Horner Joseph L.
Javidi Bahram
Walkup John F.
Collier Stanton E.
Healy Brian
Nathans Robert L.
The United States of America as represented by the Secretary of
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