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Raman optical spectrum method for identifying blackness handwriting

A technology of Raman spectroscopy and handwriting, applied in character and pattern recognition, instruments, computer parts, etc., can solve the problem of handwriting damage and other problems

Inactive Publication Date: 2008-04-16
柯惟中 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also ultraviolet spectrum and emission spectrometry methods used to test the ink components of black writing, but these methods first destroy the writing, then use chemical reagents to extract ink components, or use other chemical methods to process and measure
If the writing requirements are not damaged, traditional chemical analysis methods cannot solve the problem

Method used

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  • Raman optical spectrum method for identifying blackness handwriting
  • Raman optical spectrum method for identifying blackness handwriting
  • Raman optical spectrum method for identifying blackness handwriting

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0005] The signal was collected by LABRAM HR800 laser Raman spectrometer of JOBIN YVON company in France, and the He-Cd ultraviolet laser of KIMMON company was used as the excitation light source, and the excitation wavelength was 325nm. figure 1 These are the Raman spectra obtained under the conditions of Jinwannian, Deli, Chenguang and Zhencai brand signature pen inks, where (a) is the Raman spectrum of Jinwannian brand signature pen ink, and (b) is the Deli brand The Raman spectrum of the ink of the signature pen, (c) is the Raman spectrum of the ink of the Chenguang brand signature pen, and (d) is the Raman spectrum of the ink of the true color brand signature pen. figure 1 The Raman characteristic lines of the ink marks of various brands of signature pens appeared, as shown in the picture, the 1562cm of the ink marks of the true color brand signature pens -1 , Jin Wannian 455cm -1 Hedeli 812cm -1 . Since the intensity of the spectral line is proportional to the number ...

specific Embodiment 2

[0006] Detection purpose: When the Physical Evidence Appraisal Center of a Provincial Public Security Department identified a law enforcement document of a certain bureau in a certain county, it encountered difficulties in identifying the black writing in the inquiry transcript, and needed to identify whether some of the text in the transcript was added later.

[0007] Detection method: Raman spectrum test is carried out on the ink stains of the text mutually recognized by both parties and the ink stains of the text that needs to be determined to be added later.

[0008] Detection conditions: collect signals with LABRAM HR800 laser Raman spectrometer of JOBIN YVON company in France, use He-Cd ultraviolet laser of KIMMON company as excitation light source, excitation wavelength is 325nm, figure 2 is the Raman spectrum obtained under these conditions.

[0009] Detection steps: First, fold the document to be tested, with the text facing up and spread it flat on the stage, and us...

specific Embodiment 3

[0011] Detection purpose: To identify the actual formation time of the handwritten signature and signature date of the labor contract of a city development company limited by the signature "XX" signed on "October 1, 2003".

[0012] Detection method: Raman spectroscopy was performed on the sample ink stains that formed characters at the exact time agreed by both parties (January, February, March 2004 until after June 15, 2004) and the ink stains that need to be determined whether the actual time characters were formed test.

[0013] Detection conditions: collect signals with LABRAM HR800 laser Raman spectrometer of JOBIN YVON company in France, use He-Cd ultraviolet laser of KIMMON company as excitation light source, excitation wavelength is 325nm, image 3 is the Raman spectrum obtained under these conditions.

[0014] Detection steps: Randomly select multiple points in the black writing on the test material that has doubts about the formation time for Raman testing. The obta...

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Abstract

The invention provides a Raman spectrum method for identifying black handwriting, wherein, the method adopts ultraviolet laser light as an excitation light source; fluorescence is avoided through adopting ultraviolet laser light which directly irradiates handwriting; the Raman spectrum signals of corresponding handwritings on a detected material and a sample are respectively collected; whether the ink compositions of the handwritings are different or not can be identified from the difference of Raman peaks through comparison; moreover, the different written times of the handwritings can be identified through the relative variation of corresponding Raman peak strength. As for black handwriting containing carbon black, the forming time can be judged according to the ratio of the integral area of the Raman characteristic peak at 1600cm<-1> and the integral area of newly written handwriting at the same position. The method which is of great convenience realizes objective and actual identification without any damage on identified handwriting.

Description

technical field [0001] The invention relates to the identification technology of document material and document production time, especially the identification technology of black handwriting material composition and formation time. Background technique [0002] In recent years, with the increasing number of economic crimes and civil disputes, there are more and more inspection requirements for documents involving various bills, receipts, IOUs, IOUs, contracts, agreements and important recording materials. Whether the text content, numbers, writing time and nominal time have been added, tampered with or forged. The judicial appraisal department needs to identify these cases, analyze and study the composition of various handwriting pigments, especially the composition of black writing and the real writing time, to prove the authenticity of the documents and provide clues and evidence for exposing illegal crimes. There are three kinds of writing instruments commonly used by or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/68
Inventor 柯惟中衡航籍康
Owner 柯惟中
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