Study of UV imaging technology for noninvasive detection of latent fingerprints

Hong-xia Li; Jing Cao; Jie-qing Niu; Yun-gang Huang

doi:10.1117/12.2034451

19 September 2013 Study of UV imaging technology for noninvasive detection of latent fingerprints

Hong-xia Li, Jing Cao, Jie-qing Niu, Yun-gang Huang

Proceedings Volume 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications; 89051L (2013) https://doi.org/10.1117/12.2034451
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Using UV imaging technology, according to the special absorption 、reflection 、scattering and fluorescence characterization of the various residues in fingerprints (fatty acid ester, protein, and carboxylic acid salts etc) to the UV light, weaken or eliminate the background disturbance to increase the brightness contrast of fingerprints with the background, and design、setup the illumination optical system and UV imaging system, the noninvasive detection of latent fingerprints remaining on various object surface are studied. In the illumination optical system, using the 266nm UV Nd:YAG solid state laser as illumination light source, by calculating the best coupling conditions of the laser beam with UV liquid core fiber and analyzing the beam transforming characterizations, we designed and setup the optical system to realize the UV imaging uniform illumination. In the UV imaging system, the UV lens is selected as the fingerprint imaging element, and the UV intensified CCD (ICCD) which consists of a second-generation UV image intensifier and a CCD coupled by fiber plate and taper directly are used as the imaging sensing element. The best imaging conditions of the UV lens with ICCD were analyzed and the imaging system was designed and setup. In this study, by analyzing the factors which influence the detection effect, optimal design and setup the illumination system and imaging system, latent fingerprints on the surface of the paint tin box、plastic、smooth paper、notebook paper and print paper were noninvasive detected and appeared, and the result meet the fingerprint identification requirements in forensic science.

Citation Download Citation

Hong-xia Li, Jing Cao, Jie-qing Niu, and Yun-gang Huang "Study of UV imaging technology for noninvasive detection of latent fingerprints", Proc. SPIE 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications, 89051L (19 September 2013); https://doi.org/10.1117/12.2034451

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KEYWORDS

Ultraviolet radiation

Imaging systems

Luminescence

Reflection

Imaging technologies

Nd:YAG lasers

Charge-coupled devices

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