Technique for verifying genuineness of authenticating device

Details Technique for verifying genuineness of authenticating device Technique for verifying genuineness of authenticating device

1983-09-01

1985-07-02

McGraw, Vincent P.

Optics: measuring and testing

Document pattern analysis or verification

356394, G06K 700, G06K 900

Patent

active

045264660

ABSTRACT:
A given type of authenticating device operates as a diffractive subtractive color filter that exhibits a reflectivity spectrum that includes a peak occurring at a wavelength that varies as a substantially linear function of the angle of incidence of polychromatic illuminating light having a particular polarization. The verification technique involves simultaneously illuminating a sample device over a range of angles of incidence by the polychromatic light, and then employing the reflected light from the sample to illuminate a reference device known to be genuine over the same range of angles of incidence. A sample device is indicated as being genuine only if both the respective intensity ratios of the light reflected from the reference device to the polychromatic light and to the light reflected from the sample device exceed respective threshold values.

REFERENCES:
patent: 4484797 (1984-11-01), Knop et al.

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