为了了解在高重复频率激光剥离-火花诱导击穿光谱中原子辐射的时域特征,选择925银合金为样品,采用高重复频率激光剥离-火花诱导击穿光谱技术,通过实验研究了不同电容条件下Ag I 328.07 nm、Ag I 338.29 nm、Ag I 520.91 nm、Ag I 546.55...为了了解在高重复频率激光剥离-火花诱导击穿光谱中原子辐射的时域特征,选择925银合金为样品,采用高重复频率激光剥离-火花诱导击穿光谱技术,通过实验研究了不同电容条件下Ag I 328.07 nm、Ag I 338.29 nm、Ag I 520.91 nm、Ag I 546.55 nm、Cu I 324.75 nm、Cu I 510.55 nm原子辐射谱线的时域图。尽管这些谱线对应于不同的上能级,但由于火花放电的作用,原子辐射在时域上表现出了非常相近的特点。原子辐射的维持时间和衰减特性主要由火花放电的电学参数决定,上能级的能量高低对它们的影响并不明显。在高重复频率激光剥离-火花诱导击穿光谱中,非门控信号记录模式下记录的光谱近似等效于门控信号记录模式下记录的光谱,可以用于开展元素的定量分析,这有助于降低该技术对门控光电探测器件的要求。展开更多
High repetition rate laser-ablation spark-induced breakdown spectroscopy(HRR LA-SIBS) was first used to analyze trace elements in copper alloy samples. The 1064 nm output of an acoustooptically Q-switched Nd:YAG laser...High repetition rate laser-ablation spark-induced breakdown spectroscopy(HRR LA-SIBS) was first used to analyze trace elements in copper alloy samples. The 1064 nm output of an acoustooptically Q-switched Nd:YAG laser operated at a pulse repetition rate of 1 kHz was utilized to ablate copper alloy and to form original plasma, spark-discharge was applied to further breakdown the ablated samples and enhance the emission of the laser-induced plasma. A compact multichannel fiber spectrometer was used to analyze the plasma emission under nongated operation mode. Under the assistance of high repetition rate spark discharge, the plasma emission was able to be improved significantly. The determined limits of the detection of lead and aluminum were 15.5 ppm and 1.9 ppm by HRR LA-SIBS, respectively, which were 11 and 6 folds better than that determined by HRR LIBS under the same laser-ablation condition. This work demonstrates the feasibility of using fiber spectrometer to analyze plasma emission under non-gated operation mode and the possibility of building a portable HRR LA-SIBS system for rapid elemental analysis of copper alloys and other solid samples.展开更多
文摘为了了解在高重复频率激光剥离-火花诱导击穿光谱中原子辐射的时域特征,选择925银合金为样品,采用高重复频率激光剥离-火花诱导击穿光谱技术,通过实验研究了不同电容条件下Ag I 328.07 nm、Ag I 338.29 nm、Ag I 520.91 nm、Ag I 546.55 nm、Cu I 324.75 nm、Cu I 510.55 nm原子辐射谱线的时域图。尽管这些谱线对应于不同的上能级,但由于火花放电的作用,原子辐射在时域上表现出了非常相近的特点。原子辐射的维持时间和衰减特性主要由火花放电的电学参数决定,上能级的能量高低对它们的影响并不明显。在高重复频率激光剥离-火花诱导击穿光谱中,非门控信号记录模式下记录的光谱近似等效于门控信号记录模式下记录的光谱,可以用于开展元素的定量分析,这有助于降低该技术对门控光电探测器件的要求。
基金financially supported by National Basic Research Program (973 Program) of China under grant number 2012CB921900National Natural Science Foundation of China under grant numbers 11274123 and 11304100
文摘High repetition rate laser-ablation spark-induced breakdown spectroscopy(HRR LA-SIBS) was first used to analyze trace elements in copper alloy samples. The 1064 nm output of an acoustooptically Q-switched Nd:YAG laser operated at a pulse repetition rate of 1 kHz was utilized to ablate copper alloy and to form original plasma, spark-discharge was applied to further breakdown the ablated samples and enhance the emission of the laser-induced plasma. A compact multichannel fiber spectrometer was used to analyze the plasma emission under nongated operation mode. Under the assistance of high repetition rate spark discharge, the plasma emission was able to be improved significantly. The determined limits of the detection of lead and aluminum were 15.5 ppm and 1.9 ppm by HRR LA-SIBS, respectively, which were 11 and 6 folds better than that determined by HRR LIBS under the same laser-ablation condition. This work demonstrates the feasibility of using fiber spectrometer to analyze plasma emission under non-gated operation mode and the possibility of building a portable HRR LA-SIBS system for rapid elemental analysis of copper alloys and other solid samples.
