Signal processing for real-time identification of similar metals by laser-induced breakdown spectroscopy

Sungho SHIN; Youngmin MOON; Jaepil LEE; Hyemin JANG; Euiseok HWANG; Sungho JEONG

doi:10.1088/2058-6272/aaed6c

Plasma Science and Technology > 2019 > 21(3): 34011-034011. > DOI: 10.1088/2058-6272/aaed6c

Sungho SHIN, Youngmin MOON, Jaepil LEE, Hyemin JANG, Euiseok HWANG, Sungho JEONG. Signal processing for real-time identification of similar metals by laser-induced breakdown spectroscopy[J]. Plasma Science and Technology, 2019, 21(3): 34011-034011. DOI: 10.1088/2058-6272/aaed6c

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Signal processing for real-time identification of similar metals by laser-induced breakdown spectroscopy

School of Mechanical Engineering, Gwangju Institute of Science and Technology, 1 Oryong-dong Buk-gu Gwangju 500-712, Republic of Korea

Funds: This study was supported by the R&D Center for Valuable Recycling (Global-Top R&BD Program) of the Ministry of Environment. (Project No. 2016002250003).

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Received Date: July 23, 2018

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Abstract

Abstract

Laser-induced breakdown spectroscopy (LIBS) is regarded as a promising technique for real- time sorting of scrap metals due to its capability of fast multi-elemental and in-air analysis. This work reports a method for signal processing which ensures high accuracy and high speed during similar metal sorting by LIBS. Similar metals such as aluminum alloys or stainless steel are characterized by nearly the same constituent elements with slight variations in elemental concentration depending on metal type. In the proposed method, the original data matrix is substantially reduced for fast processing by selecting new input variables (spectral lines) using the information for the constituent elements of similar metals. Specifically, principal component analysis (PCA) of full-spectra LIBS data was performed and then, based on the loading plots, the input variables of greater significance were selected in the order of higher weights for each constituent element. The results for the classification test with aluminum alloy, copper alloy, stainless steel and cast steel showed that the classification accuracy of the proposed method was nearly the same as that of full-spectra PCA, but the computation time was reduced by a factor of 20 or more. The results demonstrated that incorporating the information for constituent elements can significantly accelerate classification speed without loss of accuracy.
- laser-induced breakdown spectroscopy,
- classification,
- similar metal,
- reduced number of spectral lines

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References

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Signal processing for real-time identification of similar metals by laser-induced breakdown spectroscopy