辅助激光加热样品增强激光诱导击穿光谱信号的研究

Enhancement of Laser-Induced Breakdown Spectral Signal by Auxiliary Laser Heating Samples

摘要: 本文提出一种使用辅助激光加热样品增强激光诱导击穿光谱信号强度的方法，针对辅助激光对于时间控制的需求设计了一套软硬件控制系统。在完成辅助激光输出时间精确控制的基础上，将辅助激光加入到激光诱导击穿光谱系统中，探究了高频脉冲激光加热金属样品对激光诱导击穿光谱信号的增强效果。在加热时间为5 s时Ca II 393.366 nm信号增强了两倍，在加热时间为20 s时Fe I 371.993 nm信号增强了两倍。结果表明，辅助激光加热样品对激光诱导击穿光谱信号具有增强的作用。

Abstract: In this paper, a method to enhance the signal intensity of Laser-induced breakdown spectrum by laser heating sample is proposed, and a hardware and software control system is designed to meet the time control requirements of auxiliary laser. Based on the accurate control of the output time of the auxiliary laser, the auxiliary laser was added into the Laser-induced breakdown spectroscopy system, and the enhancement effect of the Laser-induced breakdown spectral signal on the metal sample heated by high-frequency pulse laser was explored. The Ca II 393.366 nm signal was enhanced twice when the heating time was 5 s, and Fe I 371.993 nm signal was enhanced twice when the heating time was 20 s. The results show that the Laser-induced breakdown spectral signal can be enhanced by the auxiliary laser heating.