| 光谱学与光谱分析 |
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| Study of Laser Energy in Multi-Element Detection of Pulverized Coal Flow with Laser-Induced Breakdown Spectroscopy |
| ZHENG Jian-ping1, LU Ji-dong1*, ZHANG Bo1, CHEN Shi-he2, YAO Shun-chun1, PAN Feng-ping2, DONG Xuan1, ZHANG Xi2 |
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 |
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Abstract The logical range of laser power density and optimum laser power density were explored for multi-element analysis of pulverized coal flow with laser-induced breakdown spectroscopy in the present paper. The range of laser energy was chosen from 20 to 160 mJ in the experiment. Pulverized coal less than 200 μm in diameter of particles fell freely through feeder outlet and the rate of flow was controlled by screw feeder. Emissions were collected with pulse laser at 1 064 nm focusing on pulverized coal flow and plasma was generated. The intensity and cause of fluctuation of emission spectra at various laser energy levels were studied. A suitable range of laser power density is from 14.4 to 34.4 GW·cm-2, and the optimum laser power density is 19.5 GW·cm-2 for the determination of pulverized coal flow with LIBS.
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Received: 2013-02-21
Accepted: 2013-05-14
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Corresponding Authors:
LU Ji-dong
E-mail: jdlu@scut.edu.cn
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