摘要
搭建了一套集成微区成像的激光诱导击穿光谱系统,运用描述性统计分析方法分析了激光器的能量稳定性、光谱仪的噪声水平,重点分析、对比了气体样品和固体样品激光诱导击穿光谱信号的稳定性特征。结果表明:空气样品激光诱导击穿光谱信号具有明显的随机波动特性和正态分布特征,铝合金样品激光诱导击穿光谱信号具有明显的位置敏感特性和非随机波动特性;与空气样品相比,铝合金样品激光诱导击穿光谱信号的不稳定性主要源于光与物质相互作用区域的变化;对具有正态分布特征的激光诱导击穿光谱信号,可通过多脉冲平均来有效提高其稳定性。
A laser-induced breakdown spectroscopy system integrated with a micro-imager is developed. The energy stability of laser and background noise level of spectrometer are analyzed with the descriptive statistical method. The stability features of laser-induced breakdown spectroscopy signals in gas and solid samples are emphatically analyzed and compared. The results show that the laser-induced breakdown spectroscopy signals of air have the characteristics of random fluctuation and normal distribution. The laser-induced breakdown spectroscopy signals of aluminum alloy have the characteristics of position sensitivity and non-random fluctuation. Compared with that of the air sample, the instability of laser-induced breakdown spectroscopy signal of the aluminum alloy sample is mainly due to the change of the light-matter interaction region. The stability can be effectively improved by multi-pulse averaging for the laser-induced breakdown spectroscopy signals with normal distribution characteristics.
引文
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