Determination of the Sequence of Intersecting Lines Between Toners and Seals by Laser Fluorescence Microscope
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[1] Department of Document Examination, Criminal Investigation Police University of China
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- Localización: Journal of forensic sciences, ISSN-e 1556-4029, ISSN 0022-1198, Vol. 64, Nº. 6, 2019, págs. 1761-1768
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Fluorescence microscope is considered to be one of the most effective ways to examine the sequence of intersecting seal andtoner lines of questioned documents. In reality, however, the toner (mainly divided into compact and noncompact toners) and seal of a ques-tioned document have such a complex morphology and sequence of crossing lines that current methods cannot meet the requirement of practi-cal document identification. In view of the challenges of document examination, a laser fluorescence microscope and method are developed inthis study. The developed microscope provides additional functionality to traditional fluorescence microscopes of transmitted light modality,laser excitation, selectable excitation wavelength, and selectable fluorescence filters. The results obtained from the method of comparisonsbetween transmitted light and fluorescence modalities were positive under most conditions, particularly for noncompact toner examination forwhich a 100% accuracy rate and 90% detection rate were achieved in blind testing.
