金属腐蚀方法提高刑事物证显微摄影质量的研究

发布时间：2018-04-19 05:40

本文选题：金属承痕客体 + 腐蚀剂　；参考：《表面技术》2017年01期

【摘要】：目的通过对金属承痕客体表面使用腐蚀液进行处理,以提高其在常用的可见光源环境中的成像质量。方法对铝及铅板表面形成的线条及凹陷状痕迹,使用不同光源时光学显微镜下的成像特点进行研究,对高倍率下影响成像效果的色散现象进行分析。使用无水乙醇与50%(质量分数)丙酮的混合溶液对金属表面的痕迹进行前处理,对其成像质量进行检验,并讨论引起变化的原因。结果金属客体表面线条状痕迹中存在的微小线条会引起照明光的干涉现象,在显微拍照过程中能形成不同颜色的明暗条纹,极大地影响观察拍照质量。使用腐蚀液对金属客体表面痕迹进行腐蚀,可增大纳米尺度塑性变形部位的几何尺寸,改善显微镜的拍摄质量。结论使用特殊的腐蚀液对金属客体表面痕迹进行适当处理,可消除金属承痕客体在光学成像系统中干涉现象的发生,用此方法对金属表面痕迹进行前处理,可得到一种显微摄影条件下提高微小痕迹成像质量的方法。
[Abstract]:Aim to improve the imaging quality of metal bearing object by using corrosion solution in common visible light source environment.Methods the lines and sunken marks formed on the surface of aluminum and lead plates were studied. The imaging characteristics under optical microscope with different light sources were studied. The dispersion phenomenon affecting the imaging effect at high magnification was analyzed.Anhydrous ethanol and 50% acetone were used to pretreat the trace of metal surface, the imaging quality was tested, and the cause of the change was discussed.Results the small lines in the line trace on the surface of the metal object will cause the interference of the illumination light, and the light and dark stripes of different colors can be formed in the process of microscopic photograph, which greatly affects the quality of the observation photograph.Corrosion solution is used to corrode the surface of metal object, which can increase the geometric size of the plastic deformation position on nanometer scale and improve the quality of the microscope.Conclusion the interference phenomenon of metal bearing object in optical imaging system can be eliminated by proper treatment of metal object surface trace with special corrosion solution, and the metal surface trace can be pretreated by this method.A method to improve the imaging quality of micro-trace can be obtained under the condition of micro-photography.
【作者单位】：中国刑事警察学院痕迹检验鉴定技术公安部重点实验室;新疆警察学院刑事科学技术系;辽宁省公安厅辽宁警察协会对外交流部;
【基金】：中国刑事警察学院基金资助(No.2009)~~
【分类号】：D918.91;TG172

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