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Detection and Mapping of Latent Fingerprints by Laser-Induced Breakdown Spectroscopy

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Abstract:

Detection of latent fingerprints on a Si wafer by laser-induced breakdown spectroscopy (LIBS) is demonstrated using approximately 120 fs pulses at 400 nm with energies of 84 ± 7 μJ. The presence of a fingerprint ridge is found by observing the Na emission lines from the transferred skin oil. The presence of the thin layer of transferred oil was also found to be sufficient to suppress the LIBS signal from the Si substrate, giving an alternative method of mapping the latent fingerprint using the Si emission. A two-dimensional image of a latent fingerprint can be successfully collected using these techniques.

Keywords: LASER-INDUCED BREAKDOWN SPECTROSCOPY; LATENT FINGERPRINT DETECTION; LIBS; TWO-DIMENSIONAL SURFACE MAPPING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206778999085

Affiliations: University of Alberta, Electrical and Computer Engineering, Edmonton, AB T6G 2V4, Canada

Publication date: November 1, 2006

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