Identification method for writing time based on DART-TOF technique

A DART-TOF and time identification technology, which is applied in the field of writing time identification based on DART-TOF technology, can solve the problems of complex sample pretreatment, high labor cost, and low accuracy, and achieve accurate and reliable identification results

Inactive Publication Date: 2015-01-14
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional writing time is usually identified by Raman spectroscopy, infrared spectroscopy and gas-liquid chromatography. These methods are either not accurate, or the sample pretreatment is complicated and the labor cost is high

Method used

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  • Identification method for writing time based on DART-TOF technique
  • Identification method for writing time based on DART-TOF technique
  • Identification method for writing time based on DART-TOF technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Analysis of ink components of handwriting at different writing times

[0047] 1.1 Sample pretreatment

[0048] Take a clean cotton swab dipped in gel pen ink, and write samples on A4 paper. The writing time is: 40 weeks, 20 weeks, 10 weeks, 6 weeks, 3 weeks, and 0 weeks. Seven samples were prepared in parallel for each writing time, and a total of 42 standard sample sets were prepared. At the same time, 6 unknown sample sets were prepared by the same method, see Table 2 for details.

[0049] Table 2 Sample list

[0050] Writing time / week sample number 40 S1-S7 20 S8-S14 10 S15-S21 6 S22-S28 3 S29-S35 0 S36-S42 unknown sample U1-U6

[0051] 1.2 Sample Mass Spectrometry Data Acquisition

[0052] DART parameters: positive ion mode, ion source temperature at 350 °C, distance between DART outlet and TOF sampling cone at 3.5 cm, gate voltage at 350 V.

[0053] TOF parameters: hole 1 voltage is 5 V, ring lens v...

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Abstract

The invention relates to an identification method for writing time based on a DART-TOF (direct analysis in real time-time of flight) technique. The process comprises the following steps: firstly, performing DART-TOF mass spectrographic analysis on standard samples of different writing times, and acquiring mass spectrogram information of the standard samples; then creating a standard projection space and a correction model adopting a PLS-DA algorithm; and on the basis, adopting the same analysis method to acquire mass spectrogram information of unknown samples, and utilizing the founded standard projection space and the correction model to forecast the unknown samples, thereby performing effective distinguishing and identification on the writing times of the unknown samples, and the result is accurate and reliable.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a writing time identification method based on DART-TOF technology. Background technique [0002] In the real society, writing documents has become an effective carrier of our various social behaviors and activities, recording many relationships and affairs in our lives. Among them, legally effective birth certificates, contracts, wills and other documents play an irreplaceable role in the litigation. The economic and criminal cases caused by the forgery and tampering of the writing time of these documents are also increasing year by year, which has aroused widespread concern from the society and great attention from the public security department. Traditional writing time is usually identified by Raman spectroscopy, infrared spectroscopy, and gas-liquid chromatography. These methods are either not accurate, or the sample pretreatment is complicated and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/64
Inventor 张清华吕小宝冯昕韡丛培盛朱仲良
Owner TONGJI UNIV
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