基于常规组合光谱仪下的LIBS快速铅检测研究

激光诱导击穿光谱技术(LIBS)是一种实时在线的无损检测技术，可以满足工农业生产以及生物医学领域检测仪器高速化和自动化的要求。采用波长为1 064 nm的调Q脉冲为激发光源，常规组合光谱仪中的CCD为探测器，以纯铅、玻璃、焊锡等为样品，在建立的LIBS实验装置上对样品的铅含量进行定性定量检测。通过对不同铅含量样品的检测，初步确定了在自行搭建的全国产化系统下，铅的检测极限为0.0074%，定量检测误差多在4%左右，2～3 min即可完成定性定量分析。实验结果表明，采用光栅光谱仪和非增强型CCD完全可以实现LIBS的快速铅检测，其检测极限和检测精度基本达到了商用标准，并大大降低了实验装置成本，对LIBS在国内同行的相关实用化研究具有一定的借鉴作用。

Investigation on Rapid Detection of Lead by LIBS Based on Common Spectrograph

In the present paper, the lead concentrations of samples including glass, soldering tin and so on were determined by LIBS based on a Nd∶YAG Q-switched pulse laser with wavelength 1 064 nm as an exciting source and CCD in common spectrograph as the detector. The pulse energy on the surface of samples is about 95 mJ and the pulse width is 12 ns. By the detection of different samples, the detection limit of lead in samples was found to be 0.007 4% and the maximum relative standard deviation of quantitative analysis was about 4.0% based on the LIBS system of the instruments all made in China. The quantitative analysis can be done in two or three minutes and will spend one minute finishing the process by software in the future. The results suggest that the accuracy of determination of lead meets the challenge of quantitative analysis and the CCD can displace the very expensive ICCD as detector. The feasibility and low cost of the method, which uses common spectrometer and CCD to realize the LIBS detection, is proved by the result and our investigation will be beneficial to the LIBS application.