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NCJ Number: NCJ 240640   Add to Shopping cart   Find in a Library
Title: Application of Fluorescence Line Narrowing Spectroscopy to Forensic Fiber Examination
Author(s): Andres D. Campiglia, Ph.D. ; Michael D. Sigman, Ph.D.
Date Published: 12/2012
Page Count: 144
Sponsoring Agency: National Institute of Justice
US Department of Justice
Office of Justice Programs
United States of America
Grant Number: 2006-DN-BX-K036
Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: PDF 
Type: Report (Study/Research)
Language: English
Country: United States of America
Annotation: This project’s objective was to develop a nondestructive analytical methodology capable of producing highly discriminating identification of textile fibers collected as physical evidence in criminal investigations.
Abstract: The method developed focuses on the total fluorescence emission of fibers. In addition to the contribution of the textile dye (or dyes) to the fluorescence spectrum of the fiber, this research examined the contribution of intrinsic fluorescence impurities - i.e., impurities embedded in the fiber during fabrication of garments. This is a reproducible source of fiber comparison. This method of comparing and matching fibers eliminates the need for destructive dye extraction while significantly increasing the discriminating power of fluorescence microscopy. This method of comparing fibers is important because it does not require the destruction of the evidence in the course of extracting the dye from both the known and questioned fiber for further chemical analysis. In addition to destroying the fiber evidence, the comparison of extracted dyes is difficult because of the large amounts of textiles produced each year in replicate fiber types and colors. Further, it may not be possible to discriminate between two fibers that have been dyed with highly similar dyes. The spectral features of the visually indistinguishable fibers studied in the project provide remarkably different RTF-EEMs (room-temperature fluorescence spectroscopy and excitation emission matrices). Although a larger pool of visually indistinguishable fibers should be examined in the future, the current project achieved the goal of presenting proof of concept that provides a foundation for the development of a nondestructive methodology for forensic fiber analysis. The new methodology should be tested across multiple types of data often encountered in forensic science, so that the practical implications of the results are understandable and the methodology easily explained to juries. Extensive figures, 84 references, information on the dissemination of research findings, and appended supplementary information
Main Term(s): Forensics/Forensic Sciences
Index Term(s): Hair and fiber analysis ; Investigative techniques ; NIJ final report
   
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https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=262720

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