研究目的
To analyze the Chinese traditional medicine Artemisia annua using collinear dual-pulse laser induced breakdown spectroscopy (DP-LIBS) for the determination of trace elements and to evaluate the optical emission characteristics.
研究成果
The collinear DP-LIBS system effectively analyzed A. annua, showing stronger intensity and better accuracy compared to SP-LIBS. The method provided significant enhancement factors for the analyzed elements and offers a promising approach for the analysis of Chinese traditional medicine.
研究不足
The study focuses on the analysis of A. annua and may not be directly applicable to other medicinal herbs without further validation. The optimization of parameters is specific to the experimental setup used.
1：Experimental Design and Method Selection:
A collinear DP-LIBS system was constructed using two Nd:YAG lasers directed onto a solid target to generate plasma in air. The first laser operated at 532 nm and the second at 1064 nm. The spectral emissions of metals and nonmetals were analyzed.
2：Sample Selection and Data Sources:
A. annua samples were dried, pulverized, and pressed into tablets for analysis.
3：List of Experimental Equipment and Materials:
Two Nd:YAG lasers (Q-Smart 450 and Ultra 100), a digital pulse delay generator, a spectrograph (Andor model SR-750), and an intensified charge coupled device (Andor DH340T-18U-03, ICCD).
4：Experimental Procedures and Operational Workflow:
The lasers were focused onto the target, and the plasma emission signals were collected and analyzed. The delay time, inter-pulse time, and laser energy values were optimized.
5：Data Analysis Methods:
The spectral intensities and signal-to-background ratios were evaluated. The electron temperature and density were calculated from the spectral data.
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