Influence of Laser Energy on Measurement of Unburned Carbon in Fly Ash Particle Flow
BAI Kai-jie1, TIAN Hao-chen1, YAO Shun-chun1 , ZHANG Bo1, SHEN Yue-liang2, XU Qi-sheng2, LU Ji-dong1*
1. School of Electric Power of South China University of Technology, Guangzhou 510640, China 2. Electric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China
Abstract：The fly ash particle flow was produced by a screw feeder and then ablated by a pulse laser to create plasma. The emission spectra of fly ash were detected by laser-induced breakdown spectroscopy. The present paper focused on the influence of laser energy on the measurement of unburned carbon. Seven groups of pulse laser in the range of 40 to 130 mJ were used to ablate the f1y ash particle flow．The results show that the carbon line intensity is increased linearly with the increases in laser energy, but the SNR of carbon line increases in the range of 40 to 90 mJ and then trends to saturation, while the elimination rate of false data decreases. In this experiment, laser energy ranging from 90 to 100 mJ can enhance the plasma emission signal and improve the true spectral data of fly ash particle flow. So laser energy has close correlations with the ablation of the particle flow and the carbon line intensity .Reasonable laser energy is good for the effective ablation of the fly ash particle flow to get plasma spectra signals with good SNR.
Key words：Laser-induced breakdown spectroscopy (LIBS);Fly ash particle flow;Laser energy
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