Abstract：In metallurgical industrial production, rapid detection of the chemical elements composition of products is of great significance for real-time and on-site control of production process and product quality. Laser-induced breakdown spectroscopy (LIBS) technology has the advantages of rapid and contactless measurement without sample preparation, and is suitable for on-line in-situ monitoring of products in metallurgical industry production lines with complex environments such as high temperature and vibration. In this paper, a self-developed coaxial remote dual-pulse LIBS device is applied to detect six kinds of alloy steel standard samples at 20 m, and internal standard method and partial least squares (PLSR) method are used to quantitatively analyze three elements Cr, Mn and V in the standard samples. When applying the internal standard method, in order to improve the precision of quantitative analysis, the matrix element Fe of alloy steel is selected as the internal standard element. The relative standard deviation of the calibration curves of the three elements is 4% to 5%, and the determination of coefficient (R2) are greater than 0.98, and the relative errors are 7.64%, 7.86%, and 9.09%, respectively. When applying PLSR method, the R2 of the PLSR prediction models are all greater than 0.99, and the relative errors are 15.79%, 8.12%, 8.53%, respectively. Compared with the PLSR method, the internal standard method has obtained more accurate quantitative results. The results show that the coaxial remote double-pulse LIBS measuring device has the ability of long distance high precision detection.
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