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Research On Raman Spectroscopy Test Written Order Of Laser Printing Text And Seal Problem

Posted on:2018-05-29Degree:MasterType:Thesis
Country:ChinaCandidate:K Y SunFull Text:PDF
GTID:2336330515485277Subject:Law
Abstract/Summary:PDF Full Text Request
In the field of document inspection,identification of red sequence is a very important aspect.Over a long period of time,involved in the red sequential identification of cases,inspection of commonly used methods of incision,microscope test method.The traditional test method of a large part of the judicial appraiser's rely on experience and professional quality,the judicial identification results are easily influenced by subjective factors,low accuracy,easy for the outside world questioned the scientific instruments of judicial identification.The destructive test method is not applicable to the identification of important documents.Moreover,when the laser printed text layer and the print layer is thin,the test method of timing has become extremely difficult to judge Zhu mo.At present,nondestructive testing method has become a trend.With the development of science and technology,laser printer into the daily work and life,then the question comes,the number of laser printing files increase,so the illegal and criminal activities related to this increasingly,the timing of the red and black cases accounted for a large part of.In practice,we need a non-destructive testing method which can adapt to the high accuracy of forensic identification.Based on the above background,the author collected the samples samples of 27 kinds of laser printer to print the text of different brands and different types of the 27 and 20 print 20 copies,using Raman spectroscopy Raman spectra were measured in each experimental sample;while collecting 25 kinds of laser printer to print text and 20 STAMPS first Zhu Houmo,the first ink ink samples in a total of 1000 copies,respectively test the Raman imaging map of each test sample by Raman imaging technique.Study of Raman imaging tady in document inspection results of the field sequential identification,analysis of the influence of different laser printer brands and different materials on the seal test results.Through the experiment the following conclusions: first,the database is established by Raman spectroscopy of laser print ink,and based on the spectrum will be divided into seven categories(see Table 3),and that analysis of the components and brand laser printing ink text Never mind,by Raman spectroscopy can distinguish different components of the laser print ink;second,experiment two to establish a database of seals and on the basis of Raman spectrum,spectrum will be divided into eleven categories(see Table 6),and the analysis shows that the composition and types of seal pigment Never mind by Raman spectroscopy,can distinguish between different components of the seal;third,red timing experiment three using imaging technology Raman laser printing ink and print test text,have achieved good results,can analyze and judge tady timing.And that red timing of Raman imaging in distinguishing the laser print ink and ink,photosensitive ink,ink and ink and other types of seals of the atomic test results are not the same,the inspection of laser printing text ink and red is the best timing of inkpad seals.Finally,based on the above research,the related problems for testing laser Raman spectroscopy and the print print text tady timing and puts forward some suggestions and reflections.In the fifth chapter of this paper gives a case about tady timing large forensic technical appraisal institute already certified,through the use of Raman imaging test samples,the identification results verify the feasibility of Raman imaging in red sequence identification.
Keywords/Search Tags:Raman spectroscopy, Laser printer, Seals, Sequencing of stamping and printing
PDF Full Text Request
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