刑事技术Issue(4)：288-290,3.DOI:10.16467/j.1008-3650.2015.04.009
利用445 nm激光检测指印固有荧光
Detection of Inherent Fingerprint Fluorescence by 445 nm Laser
摘要
Abstract
Objective In crime scene investigation, it is difficult for investigators to quickly detect and collect some long-deposited and complicated fingerprints. This paper aims to explore the inherent fluorescence imaging quality of fingerprints left on different surfaces for various time, by a Portable Laser Biological Specimen Detector setting at wavelength of 445 nm. Methods Fingerprints, left on 5 different objects,were regularly extracted and visualized by 445 nm laser and an ultraviolet CCD. By compared the different visualization effects between the above handling, the impact factors on extracting potential fingerprints by 445 nm laser were analyzed along with the best time to take photos. Results Better images had been obtained from fingerprints of oil-sweat mixture by 445 nm laser. The visualization effect varied from different length of time. The fingerprints on pervious objects were displayed better with the increase of time, and kept stable after 2~4 weeks. As for impervious objects, the fingerprints were at first developed better with the increase of time. However, the visualization was getting worse past a month. Conclusions The fingerprint inherent fluorescence detected by 445 nm laser is influenced by such factors as smooth degree, object permeability and types of fingerprint, and hence the best visualizing time should be determined from different surfaces. Meanwhile, ultraviolet reflex photography is complementary to 445 nm laser photography in the process of fingerprint visualization since it is more suitable for the fresh greasy fingerprint on impermeable objects, while the 445 nm laser photography is better for the aged sweat or oil-sweat fingerprint on pervious objects. This research produces a potentially more accurate and reliable methodology for fingerprint identification.关键词
指印/445 nm 激光/固有荧光/渗透性客体/非渗透性客体Key words
latent fingerprint/445 nm laser/inherent fingerprint fluorescence/pervious objects/impervious objects分类
社会科学引用本文复制引用
杨飞黄,高树辉,侯雨石..利用445 nm激光检测指印固有荧光[J].刑事技术,2015,(4):288-290,3.基金项目
北京市重点实验室建设项目 （）
