Other
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..539c&link_type=abstract
The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 539-542 (1
Other
Organic Compounds, Polymers, Infrared Spectrometers, Auxiliary Equipment, And Techniques
Scientific paper
Individualization of undyed fibers can be a problem in analyzing fiber evidence in forensic cases. In addition to the physical and optical microscopic features, the chemical composition information from single fiber FT-IR microspectroscopy may be useful. In the case of polyester, the most commonly used fiber, only a single generic class usually is recognized. Single fiber polarized FT-IR microspectroscopy provides a means of using the molecular orientation of the macromolecules in the fiber resulting from their manufacturing history to observe spectroscopic differences. Dichroic ratios for eight usable infrared bands for PET single fibers permit multidimensional discriminant analysis. The procedure described sorts PET fibers into 10 working subclasses and demonstrates the potential of this approach for single fiber individualization. This new dimension can be added to the traditional size, shape, and other distinguishing features.
Cho Liling
Reffner John A.
Wetzel David L.
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