Study On Printed Document Examination A Forensic Analysis Using Raman Spectroscopy and Stereo Microscope

Abstract

Printed materials are frequently found as controversial or challenged documents in forensic cases. Because printers are used to create documents far more frequently than handwritten papers in these circumstances, printer inspection has become a significant necessity in questioned document analysis in recent years. Additionally, over the past 20 years, numerous printers have been implicated in the widespread forgery of printed documents. In such instances, it is important for the investigators to look into and determine the type of printer utilized and to create a connection between the contested document and the purported printer. In order to distinguish and categories them for forensic questioned document assessment and to endorse the forensic expert and interrogated document examiner throughout such investigations. The primary objective of this study is to identify the type of printer by analyzing the individual characteristics of the printed document. The 1,024 sample were collected in the form of printed documents from 32 inkjet and 32 Laser printers. Stereomicroscope has been used to analyze the class and individual characteristics of the printed documents. Raman spectroscopy has been used to analyze the inks present in the obtained documents. The print class, letter distinction, rough edge, feathering spurs, and smooth region of the samples were all examined. Each printer has a distinctive way of printing documents. The reliability of inkjet printer recognition is steady at resolutions larger than 500 dpi. The efficiency of laser printer s recognition steadily increases as sharpness rises over 300 dpi. The observations showed that the features of the letter were significantly different. This study might be helpful in differentiating between documents produced by various printer kinds. newline newlineKeywords: Printed documents, inkjet, laser, stereomicroscope, resolution, ink, paper newline newline newline