可视化检验火炸药残留物的实验——将化学传感阵列融入法化学实验教学

Visual Inspection of Explosive Residues:Integrating Chemical Sensing Arrays into Teaching ofForensic Chemistry Experiment

在法庭科学领域中爆炸案件现场火炸药残留物的可视化、快速、准确检验,可以为案件的侦查指明方向,对案件的性质做出快速判断。采用6种敏感单元构建化学传感阵列,利用数码相机对化学传感阵列进行拍照采集图像,使用Adobe Photoshop 2022对图像进行处理获取RGB数据,结合主成分分析(PCA)、聚类分析(HCA)和线性判别(LDA)对爆炸残留物种类进行判断,准确率达到100%。将有关的基于化学传感阵列可视化检验的理论与应用融入到法化学的实验教学中,能够拓展学生的科研视角,锻炼学生的实验操作能力。

In the field of forensic science,the visually rapid and accurate inspection of explosive residues at the scene of explosion cases can point out the direction for the investigation of cases and make rapid judgments on the nature of cases.In this paper,six kinds of sensitive units are used to construct the chemical sensor array.Digital cameras are used to take pictures of the chemical sensor array to collect images.Adobe Photoshop 2022 is used to process the images to obtain RGB data.Combined with principal component analysis,cluster analysis and linear discriminant analysis,the types of explosive residues are judged,with an accuracy of 100%.The theory and application of visual inspection based on chemical sensor array are integrated into the experimental teaching of forensic chemistry,which can expand students'scientific research perspective and train their experimental operation ability.