中文摘要：

In this study,a stand-off and collinear double pulse laser-induced breakdown spectroscopy(DP LIBS) system was designed,and the magnesium alloy samples at a distance of 2.5 m away from the LIBS system were measured.The effect of inter-pulse delay on spectra was studied,and the signal enhancement was observed compared to the single pulse LIBS(SP LIBS).The morphology of the ablated crater on the sample indicated a higher efficiency of surface pretreatment in DP LIBS.The calibration curves of Ytterbium(Y) and Zirconium(Zr) were investigated.The square of the correlation coefficient of the calibration curve of element Y reached up to 0.9998.

英文摘要：

In this study, a stand-off and collinear double pulse laser-induced breakdown spectroscopy （DP LIBS） system was designed, and the magnesium alloy samples at a distance of 2.5 m away from the LIBS system were measured. The effect of inter-pulse delay on spectra was studied, and the signal enhancement was observed compared to the single pulse LIBS （SP LIBS）. The morphology of the ablated crater on the sample indicated a higher efficiency of surface pretreatment in DP LIBS. The calibration curves of Ytterbium （Y） and Zirconium （Zr） were investigated. The square of the correlation coefficient of the calibration curve of element Y reached up to 0.9998.