ISSN: 0022-1198
CODEN: JFSCA
Page Count: 12

Microreflectance FTIR Techniques Applied to Materials Encountered in Forensic Examination of Documents
Andrasko, J
Associate professor, National Laboratory of Forensic Science, SKL,

(Received 19 October 1995; accepted 31 January 1996)

Abstract

Microreflectance Fourier transform infrared spectrometry (FTIR) has been applied to the forensic examination of documents. The materials examined were black printing inks, paper, plastics, photocopy toners, and transfer letters (Letra set). Good discrimination was achieved between different samples of these materials. Euclidean distances were calculated on the bases of first derivatives of measured FTIR reflectance spectra. Some results were compared with those obtained by diffuse reflectance FTIR. Microreflectance FTIR is nondestructive to the materials and may be used as a complement to optical techniques for examination of documents.

Keywords:
forensic science, questioned documents, microreflectance Fourier transform infrared spectroscopy, diffuse reflectance Fourier transform infrared spectrometry, Fourier transform infrared microscopy

Paper ID: JFS14003J
DOI: 10.1520/JFS14003J
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