Improved fake currency detector using visual and reflective spectral response

Abstract

A currency genuineness detection system with visual discrimination complemented by automatic discrimination using plurality of opto-electronic sensors with reflective and fluorescence properties of security documents is developed. The detection sensing strategy utilizes integrated response of the wide optical band sensed under UV visible along with optional near infra red light illumination. A security document is examined under static condition. A window signalsignature is thus possible from the photodetectors responses for various kinds of documents of different denominations, kinds and country of origin. A programmable technique for checking the genuineness of a security document is possible by feeding a unique code of the currency under examination.

Description

technical field

[0001] The invention relates to the development of an improved system for automatic detection of the authenticity of securities by measuring the reflected components of incident energy in three or more light bands. The system includes the use of ultraviolet, visible and optionally near-infrared light sources, photodetectors and associated sensing circuitry. The present invention relates to the use of photodetectors to generate photoelectric signals from reflected energy received by securities to verify the authenticity of securities under irradiation with ultraviolet, visible, and optionally near-infrared light. The process includes measuring reflected energy in at least three light bands as a photoelectric signature of the document by appropriately positioned photodetectors, and distinguishing counterfeit documents from genuine documents for final LED indicator display and audio-visual alarm. Electrical signal processing, thereby carrying out the detection of...

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