基于显微拉曼光谱及PCA-LDA/QDA的口罩物证品牌溯源研究  

Research on Brand Traceability of Mask Physical Evidence Based on Micro-Raman Spectroscopy and PCA-LDA/QDA

作　　者：陈壮 CHEN Zhuang(Judicial Police Academy(Public security branch),Gansu University of Political Science and Law,Lanzhou 730070,China;Institute of Evidence Law and Forensic Science,China University of Political Science and Law,Beijing 100080,China)

机构地区：[1]甘肃政法大学司法警察学院(公安分院),甘肃兰州730070 [2]中国政法大学证据科学研究院,北京100080

出　　处：《中国人民公安大学学报(自然科学版)》2024年第3期35-41,共7页Journal of People’s Public Security University of China(Science and Technology)

基　　金：甘肃省教育厅高校教师创新基金项目(2023A-100);甘肃政法大学2023年度校级科研创新项目(GZF2023XQN08)

摘　　要：探究构建口罩物证的品牌溯源分析模型。利用显微拉曼光谱法检验35个蓝色一次性外科口罩样品,共采集105个拉曼光谱数据,采用PCA进行数据预处理,并分别结合LDA和QDA构建了PCA-LDA、PCA-QDA两种口罩品牌溯源分析模型。显微拉曼光谱检测结果表明,所选35个口罩样品的材质均为聚丙烯纤维;PCA-LDA模型在训练集和测试集中实现了91.67%和90.48%的溯源准确率,表现出较高的准确性和可靠性。相比之下,PCA-QDA模型虽能应用于口罩品牌溯源,但存在过拟合的问题。研究表明,基于PCA-LDA的模型具有更优的性能,能够快速、准确、可靠地实现口罩品牌的溯源。这为口罩物证的法庭科学分析提供了一种有效的技术手段,有助于提高犯罪案件侦破的效率。A brand traceability analysis model of mask physical evidence was constructed.35 samples of blue disposable surgical masks were tested by micro-Raman spectroscopy,a total of 105 Raman spectral data were collected,and the collected data were pre-processed by Principal Component Analysis(PCA).Combined with Linear Discriminant Analysis(LDA)and Quadratic Discriminant Analysis(QDA),PCALDA and PCA-QDA brand traceability analysis models were constructed.The results of micro-Raman spectroscopy showed that all 35 mask samples were made of polypropylene fiber.The PCA-LDA model achieved 91.67%and 90.48%traceability accuracy in training set and test set,showing high accuracy and reliability.In contrast,although PCA-QDA model could be applied to mask brand traceability,it had the problem of overfitting.The research showed that the model based on PCA-LDA had better performance and could quickly,accurately and reliably realize the traceability of mask brands,which provided an effective technical means for the forensic scientific analysis of the mask evidence and helped to improve the efficiency of the detection of criminal cases.

关 键 词：显微拉曼光谱法 口罩 主成分分析 线性判别分析 二次判别分析 

分 类 号：D918.9[政治法律—法学]