使用扫描电镜-电子能谱仪检验鉴别静电复印纸

Forensic Differentiation of Electrostatic Copy Paper by SEM-EDX

建立应用扫描电镜-电子能谱仪检验不同品牌、型号静电复印纸的分析方法,实现对静电复印纸的快速检验和鉴别。实验收集不同品牌和型号的静电复印纸20种,利用扫描电镜-电子能谱仪对其进行检验,获得样品的背散射电子像BSE,结合图像处理技术对样品的表面结构进行量化分析;通过能谱图对样品进行无机元素相对含量进行分析检测。依据BSE中无机填料的相对百分含量,样本能谱图中钙、碳元素的相对百分含量,碳、氧元素的相对百分含量,氯元素的含量可对不同品牌、型号的静电复印纸进行鉴别。结果表明,应用扫描电镜-电子能谱仪可对静电复印纸进行快速、准确、有效的检验,该方法适用于文件物质材料检验,为纸张的鉴别、比对和同一认定提供了一种实用方法。

A method to examine electrostatic copy paper of different brand,specification by SEM-EDX was established,in order to inspect and identify electrostatic copy paper in forensic science.20 kinds of electrostatic copy paper of different brands and specification were collected and analyzed by using SEM-EDX to obtain the BSE of the samples,combining with image processing technology the surface structure of the samples was analyzed.The filler composition and content of the samples were detected quantitatively through the Emk DS,and whether the samples contained chlorine elements was analyzed quantitatively.The results proved that the SEM-EDX could identify the electrostatic copy paper quickly and effectively,which could be used to examine the faked contracts and prints in the field of forensic science,provide clues to criminal investigation and the evidence for court proceedings.