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Exploring ATR Fourier transform IR spectroscopy with chemometric analysis and laser scanning microscopy in the investigation of forensic documents fraud
Optics & Laser Technology ( IF 5 ) Pub Date : 2020-11-05 , DOI: 10.1016/j.optlastec.2020.106704
S. Farid , M.A. Kasem , A.F. Zedan , G.G. Mohamed , A. El-Hussein

Forensic examiners are overwhelmed every day by many cases of official and other business documental forgery. Many cases of which involve the addition or deletion of one or more similar writing/copying paper(s) to the original document. Another challenge that faces the examiners is the determination of the intersected signature lines chronological sequence. This suggests a forgery case in that instance if such modifications are made without the consent of all parties. The importance of the documents under question mandates the usage of non-destructive discriminative analytical methods. The main tool used by the forensic examiners in the Egyptian medicine forensic authority is the Video spectral comparator (VSC). However, in many times the latter doesn’t give conclusive suggestions to the examiner who becomes hesitant to give a fair judgement on the case. The current study investigated the use of a molecular spectroscopic technique like Fourier transform infrared spectroscopy (FTIR) in the discrimination between writing/copying papers and the sequence of the used writing inks by Atomic force microscopy (AFM) as non-destructive techniques. The apparently similar used papers were from the commonly used documents under question in the Egyptian market. We investigated 12 different main types of office/copying paper and the toner inks of two different laser printers versus three brands of blue ballpoint pens in the Egyptian market. FTIR spectroscopy and AFM were found to be potential tools that can be combined with VSC in the discrimination between different papers and determining the chronological sequence of writing inks. Principal component analysis (PCA) as a multivariate analysis tool achieved a satisfactory discrimination capacity between the 12 papers in the FTIR region 830–1185 cm−1.



中文翻译:

用化学计量学和激光扫描显微镜研究ATR傅里叶变换红外光谱法在法证文件欺诈调查中的作用

每天,许多官方和其他商业文件伪造案件使法医审查员不知所措。许多情况涉及在原始文档中添加或删除一张或多张相似的书写/复印纸。审查员面临的另一个挑战是确定相交的签名线的时间顺序。如果在未经各方同意的情况下进行此类修改,则表明存在伪造案件。所涉文件的重要性要求使用非破坏性的鉴别分析方法。埃及医学法医鉴定所的法医检查人员使用的主要工具是视频光谱比较器(VSC)。然而,在很多情况下,后者并没有给审查员提供最终的建议,而审查员却不愿对案件做出公正的判断。当前的研究调查了分子光谱技术(如傅立叶变换红外光谱法(FTIR))在原子/力显微镜(AFM)作为无损检测技术对书写/复印纸和使用过的书写墨水顺序的区分中的用途。看起来相似的废纸来自埃及市场上正在讨论的常用文件。我们调查了埃及市场上12种不同主要类型的办公/复印纸以及两种不同的激光打印机和三种品牌的蓝色圆珠笔的墨粉墨水。发现FTIR光谱和AFM是可以与VSC结合使用的潜在工具,可以区分不同的纸张并确定书写墨水的时间顺序。主成分分析(PCA)作为多变量分析工具,在FTIR区域830-1185 cm内的12篇论文之间具有令人满意的判别能力-1

更新日期:2020-11-06
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