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Abstract

A bank note processing system having a single illumination source and a single detector to simultaneously detect both fluorescence and phosphorescence. The bank note processing system includes an optical detection module which has a detector and an illuminator. The illuminator directs a higher intensity light to the bank note in a predetermined measurement area on a conveying path, and the detector measures the bank note's fluorescence. The illuminator then directs a lower intensity light to the bank note, and the detector measures the bank note's phosphorescence. Additional fluorescence measurements and phosphorescence measurements may be obtained in the same manner over a time period as the bank note is transported on the conveying path through the measurement area. The successive fluorescence measurements and phosphorescence measurements over the time period are collected and averaged by averaging circuits, and the optical detection module determines whether the bank note is a counterfeit bank note using the measured fluorescence and the measured phosphorescence.

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First Claim