In order to maintain the pipeline better and remove the dirt more effectively, it was necessary to analyze the contents of elements in dirt. Mg in soil outside of the pipe and the dirt inside of the pipe was quantitatively analyzed and compared by using the laser-induced breakdown spectroscopy （LIBS）. Firstly, Mg was quantitatively analyzed on the basis of Mg I 285.213 nm by calibration curve for integrated intensity and peak intensity of the spectrum before and after subtracting noise, respectively. Then calibration curves on the basis of Mg II 279.553 nm and Mg II 280.270 nm were analyzed. The results indicated that it is better to use integrated intensity after subtracting noise of the spectrum line with high relative intensity to make the calibration curve.
为了提高激光诱导击穿光谱的信噪比,从理论上讨论了激光诱导击穿光谱信号与延迟时间之间的关系。利用激光诱导击穿光谱仪对GBW07716合成灰岩标准样品进行了测试,并分析了Ni I 305.432nm、Ni I 313.411nm、Ni I 351.505nm等3条谱线强度随延迟时间的变化特征。结果表明,谱线随延迟时间的变化趋势主要与能级的寿命有关,而不是跃迁几率Aij。当延迟时间大于2μs时,从同一高能级辐射出来的谱线随延迟时间的变化趋势相同,而从不同高能级跃迁到同一低能级的谱线随延迟时间的变化趋势不相同。
