Quantitative analysis of Cu-Zn alloys using CF-LIBS with self-absorption correction in a quasi-optically thin state
The calibration-free(CF)method is a quantification approach for laser-induced breakdown spectroscopy(LIBS)that enables the content determination of detected elements without a calibration curve.However,the actual quantitative results of traditional CF-LIBS often exhibit discrepancies with respect to the real values.In order to improve the accuracy of CF-LIBS quantitative analysis results,three standard Cu-Zn alloy targets with different mass ratios were used for the calculation of CF-LIBS quantitative analysis,and accurate quantification of the Zn/Cu quality ratio in the alloys was successfully achieved through utilization of"quasi-optically thin state"and"self-absorption correction".In the implementation,we firstly approached the theoretical intensity ratio of copper lines(I521.8 nm/I515.3 nm)by adjusting laser energies and detection delays,so as to find the"quasi-optically thin state"of the plasma.And then,under such a plasma state,the spectral intensity was well corrected by the self-absorption via referencing the corresponding coefficient.Based on the proposed method,the Cu/Zn quality ratio was accurately determined using CF-LIBS,exhibiting excellent agreement with the actual content.The quantitative biases of the three standard copper-zinc alloy targets were observed all less than 3.5%,indicating high precision of measurements.It proves that the developed method is effective in improving alloys quantitation of LIBS,and more applications are expected in other fields in the future.
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