中文摘要：

将激光诱导击穿光谱技术（LIBS）应用于煤粉颗粒流的直接检测，利用自行搭建的颗粒流实验台架重点研究不同收光角度下煤粉颗粒的等离子体光谱特性，分析煤中具有代表性的C，Si和Al三种元素原子谱线的强度及其相对标准偏差的变化规律，结果表明收光角度在30°～45°区间时收集到的等离子体信号强且稳定。

英文摘要：

Laser-induced breakdown spectroscopy （LIBS） was applied to directly detect the coal particle flow. An investigation of the impact of different spectrometer detector angles measured from the laser incident axis on the plasma properties was conducted on the self-built two-phase particle flow experiment bench. Coal particle flow was used as the experimental sample. An analysis of the variation in the emission intensity and relative standard deviation （RSD） was carried out. The atomic spectral lines of C, Si and A1 which are representative elements in coal were chosen as the analytical lines. Then the influence of the spectra acquired with different collection angles was discussed. The results demonstrated that the strong and stable intensity signal can be acquired in the collection angle range from 30° to 45°.