表面技术2017，Vol.46Issue(1)：200-205,6.DOI:10.16490/j.cnki.issn.1001-3660.2017.01.032
金属腐蚀方法提高刑事物证显微摄影质量的研究
Improving Imaging Quality of Criminal Photography Photomicrograph by Corrosion of Metals
摘要
Abstract
To improve the image quality of criminal photography through surface treatment on the metallic trace carrier to upgrade the imaging quality in ordinary environment of visible light sources. The imaging characteristics of traces with shapes of line and concave formed on the surface of Al and Pb boards were investigated by an optical microscope with different light sources. The dispersion phenomena under high magnification were analyzed in order to validate their effects on the imaging quality. After pre-processing of traces on the metal surface with mixed solution of absolute ethyl alcohol and 50% (mass frac-tion) acetone, the imaging quality was tested and the causes of changes were discussed. Tiny lines in the traces on the metal sur-face could lead to optical interference, which resulted in the formation of light and dark stripes with different colors in the opti- cal microscope photomicrograph. Proper treatment of traces on metallic trace carrier with special etching solution can eliminate interference of trace carrier in the optical imaging system. Pretreatment of traces on metal surface with this method can improve the imaging quality of tiny trances in photomicrography.关键词
金属承痕客体/腐蚀剂/光学显微镜/色散现象/成像质量Key words
metallic trace carrier/etching solution/optical microscope/dispersion/imaging quality分类
矿业与冶金引用本文复制引用
谢冬柏,李欣庭,单国,陈宇..金属腐蚀方法提高刑事物证显微摄影质量的研究[J].表面技术,2017,46(1):200-205,6.基金项目
中国刑事警察学院基金资助(No.2009) Suported by the National Police University of China Fund (No.2009) （No.2009）
