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NCJRS Abstract

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NCJ Number: 220422 Find in a Library
Title: Fluorescence Spectra and Images of Latent Fingerprints Excited With a Tunable Laser in the Ultraviolet Region
Journal: Journal of Forensic Sciences  Volume:52  Issue:5  Dated:September 2007  Pages:1103-1106
Author(s): Norimitsu Akiba Ph.D.; Naoki Saitoh B.S.; Kenro Kuroki Ph.D.
Date Published: September 2007
Page Count: 4
Type: Report (Study/Research)
Format: Article
Language: English
Country: United States of America
Annotation: This study used a tunable laser in order to clarify the optimal excitation wavelength for detecting the fluorescence of fingerprints in the ultraviolet region and to obtain fluorescence images of fingerprints with the optimal excitation wavelength; the influence of continuous irradiation on the fluorescence of fingerprints at the optimal excitation was also studied.
Abstract: The images of latent fingerprints on white paper were observed, and the clearest image was obtained with excitation at 280 nm. The influence of continuous irradiation on the fluorescence of fingerprints was also measured at the optimal excitation wavelengths. The 330 nm peak was dominant at first, but its intensity waned as the total irradiation time increased. Although the 440 nm peak was weak at first, its intensity increased after continuous laser irradiation. The tunable laser consists of a nanosecond pulsed Nd-YAG laser and an optical parametric oscillator crystal. The fluorescence spectra and images were measured at various excitation wavelengths in the ultraviolet region by the time-resolved fluorescence method. Excitation spectra were measured for two main peaks at approximately 330 and 440 nm. The repetition rate of the laser pulse was 10 Hz, and the time width of the individual pulses was approximately 5 nsec. The intensity of each fluorescence spectrum was normalized by an averaged power value acquired from a laser power meter. The delay time was from 4 to 10 seconds. A fingerprint was pressed on a nonfluorescent quartz slide glass or on high-grade white paper after wiping the forehead or nose with fingers. Before impression, the finger was washed with soap and dried in the air. 5 figures and 12 references
Main Term(s): Criminology
Index Term(s): Fingerprint detection techniques; Foreign criminal justice research; Forensic sciences; Investigative techniques; Japan; Laser fingerprint detection; Ultraviolet techniques
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