Abstract
The emission spectra of laser induced 304 stainless steel plasma are obtained. The principal elements contained in the sample are decided by assignment of the spectral lines. They are Si, Mn, Ni, Cr, and Fe. There are few of spectral lines about the light elements S, P, and C. The quantities of the principal elements are deduced based on the intensity of spectral line and with the method of free calibration. The concentrations of Si, Mn, Ni, Cr and Fe are 0.08%, 0.781%, 8.788%, 16.138% and 72.77% respectively. Further, we select emission lines, which comes from higher upper energy level and accompany with lower transition probability, as internal reference standard to correct the effect of self-absorption. It is found that after correction, the points distributed on the Boltzmann plot are more regular and the quantitative analysis of eigen elements Ni and Cr in stainless steel are more close to the standard value. The accuracy is improved 5% and 12.7% respectively. Compared with other correction algorithms, the method of internal reference line does not need a large number of parameters. It is suitable for on-line detection of laser induced breakdown spectroscopy.
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