刑事技术
刑事技術
형사기술
FORENSIC SCIENCE AND TECHNOLOGY
2015年
3期
222-226
,共5页
激光打印文件%扫描电镜/能谱仪%定性分析%定量分析%墨粉%纸张
激光打印文件%掃描電鏡/能譜儀%定性分析%定量分析%墨粉%紙張
격광타인문건%소묘전경/능보의%정성분석%정량분석%묵분%지장
laser printing documents%SEM/EDX%qualitative analysis%quantitative analysis%ink%paper
目的：应用扫描电镜/能谱法检验不同品牌和型号激光打印机的打印文件，实现对不同机型打印文件的区分。方法收集不同品牌和型号激光打印机10台，利用扫描电镜/能谱仪对相同的打印字符进行无机元素分析，获得样品的能谱图和mapping分析图，对样品进行定量和半定性分析；同时收集10个不同品牌的A4静电复印纸，分析纸张对实验结果的影响。结果依据所含元素的种类可以将10台激光打印机分为四类；依据主要元素相对百分含量的比值，对不同品牌和型号激光打印文件进行区分；研究结果表明纸张因素对定性结果影响较小，对定量结果影响较大。结论扫描电镜/能谱法可以简单、快速、无损的区分和识别激光打印文件，可以应用于二次打印文件的检验，为侦查破案提供线索。
目的：應用掃描電鏡/能譜法檢驗不同品牌和型號激光打印機的打印文件，實現對不同機型打印文件的區分。方法收集不同品牌和型號激光打印機10檯，利用掃描電鏡/能譜儀對相同的打印字符進行無機元素分析，穫得樣品的能譜圖和mapping分析圖，對樣品進行定量和半定性分析；同時收集10箇不同品牌的A4靜電複印紙，分析紙張對實驗結果的影響。結果依據所含元素的種類可以將10檯激光打印機分為四類；依據主要元素相對百分含量的比值，對不同品牌和型號激光打印文件進行區分；研究結果錶明紙張因素對定性結果影響較小，對定量結果影響較大。結論掃描電鏡/能譜法可以簡單、快速、無損的區分和識彆激光打印文件，可以應用于二次打印文件的檢驗，為偵查破案提供線索。
목적：응용소묘전경/능보법검험불동품패화형호격광타인궤적타인문건，실현대불동궤형타인문건적구분。방법수집불동품패화형호격광타인궤10태，이용소묘전경/능보의대상동적타인자부진행무궤원소분석，획득양품적능보도화mapping분석도，대양품진행정량화반정성분석；동시수집10개불동품패적A4정전복인지，분석지장대실험결과적영향。결과의거소함원소적충류가이장10태격광타인궤분위사류；의거주요원소상대백분함량적비치，대불동품패화형호격광타인문건진행구분；연구결과표명지장인소대정성결과영향교소，대정량결과영향교대。결론소묘전경/능보법가이간단、쾌속、무손적구분화식별격광타인문건，가이응용우이차타인문건적검험，위정사파안제공선색。
ABSTRACT:ObjectiveThis paper aims to distinguish documents printed with different brands and models of laser printer using scanning electron microscopy with energy dispersive X-ray (SEM/EDX).MethodsDocuments printed with 10 brands and models of laser printers were collected, and SEM/EDX was used to analyze the inorganic elements of characters on the documents. Each sample was tested three times and energy spectra and mapping analysis charts were obtained. Qualitative and semi-quantitative analyses were also conducted and the elemental components and their distribution in ink of printing characters were determined. In order to analyze the inlfuence of paper, 10 brands of A4 xerographic papers were collected and elements were analyzed on the blank area.Results10 brands and models of laser printers were divided into 4 categories according to element C, O, Na, Al, Si, Cl, Ca, and Fe detected from the printing characters. The ratio of C/O and Ca/C of laser printing characters were calculated to distinguish the brands and models of laser printer in the same category. The analysis of A4 xerographic paper indicated that the paper type had greater impact on the results of quantitative analysis of ink than qualitative analysis result.ConclusionsSEM/EDX is a very attractive technique for laser printer ink analysis, and can be used to discriminate laser printing documents. It can also be used in the examination of secondary laser printing documents. This approach is simple, rapid, reliable and non-destructive.
