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Method for inspecting paper currency

An inspection method and technology for banknotes, applied in the field of physical evidence inspection, can solve the problems of inability to inspect physical evidence of "black banknotes", and achieve the effects of good application prospects, accurate results and good stability

Inactive Publication Date: 2009-11-18
GUANGZHOU CRIMINAL SCI & TECH RES INST
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Problems solved by technology

However, because the physical and chemical properties of paper materials have changed after being dyed black with dyes, the traditional identification methods of optical characteristics of banknotes, such as ultraviolet fluorescence spectroscopy, infrared transmission method, light reflection method, etc., cannot test the "black banknote" physical evidence. There are no reports of related inspection techniques in domestic and foreign literature

Method used

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  • Method for inspecting paper currency
  • Method for inspecting paper currency
  • Method for inspecting paper currency

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Experimental program
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Embodiment Construction

[0025] The micro-beam X-ray fluorescence spectroscopic analysis technology is used to analyze the elemental surface distribution of the blackened banknotes, and the elemental surface distribution results of the blackened banknotes are obtained. The authenticity of the samples and the type are judged according to the elemental surface distribution characteristics.

[0026] Analysis results of the element surface distribution of the blackened banknotes: Taking the blackened 1999 dollar bill and the blackened 2006 dollar bill of 100 dollars as examples, both banknotes show the same The element distribution characteristics of the element (take the X-ray CaK distribution of the K line system characteristic of Ca element as an example, see figure 1 , figure 2 ), indicating that the special paper material and fine manufacturing process make the banknotes have better stability. Although the banknotes are dyed black, the elements contained in them have not migrated significantly. In ...

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Abstract

The invention belongs to the field of material evidence inspection, in particular relates to a method for inspecting paper currency, and uses micro beam XPF to perform non-destructive analysis on an experiment sample. Under the incident micro beam X-ray, a computer software scans a sample by automatically controlling the sample to move continually; characteristic X-ray photons excited by each scan point enter an energy detector, and form a spectrum by being processed through an amplifier and a multichannel analyzer; and a two-dimension element scattergram of the sample is obtained after scanning. Finally, the distribution characteristics of element surfaces of a sample paper currency and a known paper currency are compared to obtain an analysis result. The method has the characteristics of no loss, high sensitivity, accurate result and the like, and has excellent application prospect.

Description

technical field [0001] The invention belongs to the field of physical evidence inspection, and in particular relates to a banknote inspection method. Background technique [0002] In recent years, there has been a criminal case of defrauding genuine and counterfeit banknotes that have been blackened ("black banknotes"). The suspect defrauded the victim by demonstrating the use of chemical reagents to restore the blackened real banknotes, and then encouraged the victim to buy chemical reagents or blackened counterfeit banknotes to defraud money. Such cases usually have a great influence on the society because of the large amount of money involved and the fact that the suspect is a foreigner. [0003] In such cases, "black banknotes" are the key physical evidence to prove the crime, so scientific identification is required. However, due to the changes in physical and chemical properties of paper materials after they are dyed black with dyes, traditional paper currency identi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07D7/06
Inventor 胡孙林戴维列张小婷王松才沈辉
Owner GUANGZHOU CRIMINAL SCI & TECH RES INST
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