Journal
APPLIED SPECTROSCOPY
Volume 65, Issue 6, Pages 611-619Publisher
SOC APPLIED SPECTROSCOPY
DOI: 10.1366/10-06214
Keywords
Raman spectroscopy; Explosives; Chemical imaging; Hyperspectral imaging; Biometrics; Forensics
Categories
Funding
- Army Technology Objective Detection of Unknown Bulk Explosives [R.FP.2010.01]
- National Research Council at the U.S. Army Edgewood Chemical Biological Center
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We have previously demonstrated the use of wide-field Raman chemical imaging (RCI) to detect and identify the presence or trace explosives in contaminated fingerprints. In this current work we demonstrate the detection of trace explosives in contaminated fingerprints on strongly Raman scattering surfaces such as plastics and painted metals using an automated background subtraction routine. We demonstrate the use of partial least squares subtraction to minimize the interfering surface spectral signatures, allowing the detection and identification of explosive materials in the corrected Raman images. The resulting analyses are then visually superimposed on the corresponding bright field images to physically locate traces of explosives. Additionally, we attempt to address the question of whether a complete RCI of a fingerprint is required for trace explosive detection or whether a simple non-imaging Raman spectrum is sufficient. This investigation further demonstrates the ability to nondestructively identify explosives on fingerprints present on commonly found surfaces such that the fingerprint remains intact for further biometric analysis.
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