Secondary detection system for security validation

Details Secondary detection system for security validation Secondary detection system for security validation

1976-11-10

1979-04-03

McGraw, Vincent P.

Optics: measuring and testing

Infrared and ultraviolet

250239, 250349, 250556, 356 71, 356448, G01N 2134, G06K 908, G06K 710

Patent

active

041474309

ABSTRACT:
A secondary detection system for utilization with a security validation apparatus wherein a sensing is made of the amount of light reflected from a given area of a paper security. Fundamentally, the invention consists of an infrared lamp or other emission source casting light through a tunnel and upon a highly reflective but partially transmissive surface. The reflective surface directs a large portion of the light onto the paper security. A first solar cell is provided in juxtaposition to the reflective surface for sensing the amount of light reflected onto the paper while a second solar cell is provided for receiving and sensing that quantity of light reflected back from the paper. A comparator circuit is interconnected between the two solar cells to determine the validity of the paper security on the basis of the percentage of light incident to the paper which is reflected therefrom. In actuality, the reflective surface is partially light transmissive and the first solar cell is positioned behind the reflective surface such that the reading of the light reflected by the reflective surface is actually achieved by the determination of the amount of light transmitted therethrough.

REFERENCES:
patent: 3664752 (1972-05-01), Hermieu
patent: 3916194 (1975-10-01), Novak et al.

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