China Plastics ›› 2021, Vol. 35 ›› Issue (1): 78-83.DOI: 10.19491/j.issn.1001-9278.2021.01.013

• Processing and Application • Previous Articles     Next Articles

Classification of Vehicle Bumpers Through Micro⁃laser Raman Spectroscopy Based on PCA⁃LDA

QIU Weilun1, ZHOU Yanwu2, SHI Mengliang2   

  1. 1.School of Forensic Science,Hunan Police College,Changsha 410138,China
    2.Criminal Investigation Brigade of Xiangtan County Public Security Bureau,Changsha 411228,China
  • Received:2020-07-27 Online:2021-01-26 Published:2021-01-22

Abstract:

The method based on micro-laser Raman spectroscopy and multivariate modeling was proposed to realize the fast, non-destructive and accurate classification of vehicle bumpers in the forensic science. The automatic baseline correction, peak area normalization, and Savitzky-Golay smoothing (3rd degree polynomial, 7-point smoothing) were selected for pre-processing. A classification model was constructed through principal component analysis and linear discriminant analysis. The results indicated that the overall classification accuracy rate was 95.24 % as an ideal result. For the unknown sample in the actual case, this method was used to determine the brand as Buick, which was consistent with the real result. A micro-laser Raman spectroscopic analysis technology and multivariate modeling methods can realize the classification of different brands of vehicle bumpers exactly. This can provide a certain reference for the relevant research in the trace evidence identification.

Key words: micro-laser Raman spectroscopy, vehicle bumper, principal component analysis, linear discriminant analysis, classification

CLC Number: