Fast Identification of Plastics with Laser-Induced Breakdown Spectroscopy
SUN Qian-qian, DU Min, GUO Lian-bo, HAO Zhong-qi, YI Rong-xing, LI Jia-ming, LIU Jian-guo, SHEN Meng, LI Xiang-you*, ZENG Xiao-yan, LU Yong-feng
Wuhan National Laboratory for Optoelectronics, Laser and Terahertz Technology Division, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract：Laser-induced breakdown spectroscopy (LIBS) combined with support vector machine (SVM) was adopted to identify 20 kinds of different colored industrial plastics from different manufacturers in open air. The experimental parameters of spectral acquisition were optimized firstly. 100 spectra recorded under optimum conditions were randomly and equally divided into training set and test set. 6 non-metallic characteristic spectral lines were used to avoid the interference with metallic lines. And the training time of SVM model was reduced. The results show that 996 of 1 000 test spectra were identified correctly and the average classification accuracy is reached to 99.6%. The classification efficiency is improved with 6 non-metallic characteristic spectral lines. The research demonstrates that, when fewer of major non-metallic characteristic spectral lines are used, laser-induced breakdown spectroscopy technique with support vector machine can identify more kinds of plastics with high accuracy and efficiency.
Key words：Laser-induced breakdown spectroscopy; Characteristic spectral lines of non-metallic elements; Support vector machine; Plastics identification
孙倩倩，杜 敏，郭连波，郝中骐，易荣兴，李嘉铭，刘建国，沈 萌，李祥友，曾晓雁，陆永枫. 塑料激光诱导击穿光谱技术快速分类应用研究[J]. 光谱学与光谱分析, 2017, 37(07): 2205-2209.
SUN Qian-qian, DU Min, GUO Lian-bo, HAO Zhong-qi, YI Rong-xing, LI Jia-ming, LIU Jian-guo, SHEN Meng, LI Xiang-you, ZENG Xiao-yan, LU Yong-feng. Fast Identification of Plastics with Laser-Induced Breakdown Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(07): 2205-2209.
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