Abstract
In recent years, when rapid growth of the number of people crossing state borders is observed it is very im-portant to identify the authenticity of identity documents. Therefore it is becoming very important the impact of both the human factor and the role of application of appropriate technical measures and new methods on the possibility to detect partial changes in the document or forged in whole documents at the stage of primary inspection. This research is dedicated to the identity document - passport data page authenticity tests which are based on non-destructive testing - holographic interferometry methods and the determination of passport data page thermal expansion effect on the surface deformation. Tests were performed with original and forged passports, the data page fixing conditions in a special holder, and thermal load parameters were deter-mined. The obtained results in the form of holographic interferograms confirmed the hypothesis claims that sur-face deformation of the data page in counterfeit passport is clearly different from the original passport‘s data page. The obtained experimental results confirm the possibility to apply the selected non-destructive testing methodology for determining authenticity of the passports. DOI: http://dx.doi.org/10.5755/j01.mech.19.6.5852
Highlights
New information technologies with increasing rate are entering into our daily life, internet commerce and different payments are spreading rapidly, more and more contracts are being signed by electronic signatures
Analysis of the expansion is performed simultaneously throughout the whole surface of the analysed structure when one side of the sheet is uniformly heated by a heat source of certain temperature and the results are fixed by the method of two exposition holographic interferometry
During experimentation optimal distance between the heat source and the data page, temperature of the heat flow, optimal heating duration parameters of the data page fixing along its perimeter and the necessary clamping force were determined
Summary
New information technologies with increasing rate are entering into our daily life, internet commerce and different payments are spreading rapidly, more and more contracts are being signed by electronic signatures. Particular values of physical parameters (in the case under analysis of thermal conductivity) in mechanically damaged and non-damaged zones were investigated experimentally It can be distinguished the two main methods of the document forgery: making (by any method) a totally new document or by changing some part of an original document – adding (printing) falsified data, changing the original content by mechanical (erasing, scraping and similar) or chemical (washing, etching, painting by corrective material and other) means substituting the primary original data by other data. Investigation results of the identity document (passport) forgery and counterfeit carried out by the institutions of The Ministry of the Interior of the Republic of Lithuania show that most frequently the pages are damaged by mechanical means in the zone of photo and data recording area. In order to verify the hypothesis theoretical and experimental research applying one of the methods of non-destructive testing – the method of two exposition holographic interferometry having the resolution up to tenth parts of light wave length and the real time method which enables to observe thermal expansion process of the page in real time were carried out
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