Optical method and apparatus for authenticating degaussed magnet

Details Optical method and apparatus for authenticating degaussed magnet Optical method and apparatus for authenticating degaussed magnet

1992-12-15

1994-12-20

Willis, Davis L.

Registers

Coded record sensors

Particular sensor structure

235457, G06K 710

Patent

active

053748166

ABSTRACT:
In a preferred embodiment, a method of authenticating an identification article, the identification article having thereon first and second optical strips bearing compound diffraction grating patterns, each optical strip including at least first and second diffraction grating elements, the method comprising: optically reading the first optical strip to detect when the first diffraction grating elements are present; and simultaneously optically reading the second optical strip to detect the relationship of the first and second diffraction grating elements on the second optical strip relative to the first diffraction grating elements on the first optical strip, thereby to develop an optical signature for the identification means.

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