[Study of laser energy in multi-element detection of pulverized coal flow with laser-induced breakdown spectroscopy].
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 microm 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 x cm(-2), and the optimum laser power density is 19.5 GW x cm(-2) for the determination of pulverized coal flow with LIBS.
Jian-Ping
JP
Zheng
Ji-Dong
JD
Lu
Bo
B
Zhang
Shi-He
SH
Chen
Shun-Chun
SC
Yao
Feng-Ping
FP
Pan
Xuan
X
Dong
Xi
X
Zhang