Quantitative Analysis of Concentration of Dense Phase Pulverized Coal Using Terahertz Time-Domain Spectroscopy

Liang Liang; Jianhua Zhang; Zhiqiang Hu

doi:10.3788/LOP57.153003

Laser & Optoelectronics Progress, Volume. 57, Issue 15, 153003(2020)

Quantitative Analysis of Concentration of Dense Phase Pulverized Coal Using Terahertz Time-Domain Spectroscopy

Liang Liang^*, Jianhua Zhang, and Zhiqiang Hu

Author Affiliations

School of Mechanical & Electrical Engineering, Xuzhou University of Technology, Xuzhou, Jiangsu 221018, China

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Figures & Tables(7)

Fig. 1. Optical path of THz time-domain spectral system

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Fig. 2. Terahertz absorption coefficients of coal samples at different concentrations

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Fig. 3. Variable selection results of GA-PLS-R. (a) Number of variables as a function of R_MSEC; (b) statistical frequency of selected variables

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Fig. 4. Results of sample prediction set obtained by three methods. (a) GA-PLS-R; (b) biPLS-R; (c) iPLS-R

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Table 1. Measurement data of sample sheets

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Table 1. Measurement data of sample sheets

Sample	Mass of HDPE m_h /mg	Mass of coal m_c /mg	Thickness of sheet h_t /mm	Volume concentration v_c /%
HDPE	60.2	-	0.514	-
Coal #1	59.3	2.1	0.534	2.10
Coal #2	60.1	3.9	0.532	3.92
Coal #3	60.3	5.4	0.540	5.34
Coal #4	60.5	7.1	0.541	7.01
Coal #5	59.2	10.2	0.541	10.07
Coal #6	59.7	13.6	0.543	13.38
Coal #7	60.9	14.9	0.550	14.48
Coal #8	60.4	17.1	0.552	16.55

Table 2. Variable selection results of iPLS and biPLS
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Table 2. Variable selection results of iPLS and biPLS
Modelingmethod Interval Number oflatentvariables Frequencyrangef /THz
9 3.19-3.39
iPLS-R 2 5 1.71-1.92
4 2.14-2.36
6 2.58-2.80
biPLS-R 11 5 3.59-3.79
15 4.38-4.56

Table 3. Comparison of regression modeling results
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Table 3. Comparison of regression modeling results
Modeling method Number of latentvariables $R_{c}^{2}$ $R_{p}^{2}$ R_MSEC R_MSEP
GA-PLS-R 7 0.9585 0.9568 1.0139 1.0345
iPLS-R 5 0.8373 0.7633 2.4743 2.1524
biPLS-R 5 0.9280 0.9072 1.1843 1.2761

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Liang Liang, Jianhua Zhang, Zhiqiang Hu. Quantitative Analysis of Concentration of Dense Phase Pulverized Coal Using Terahertz Time-Domain Spectroscopy[J]. Laser & Optoelectronics Progress, 2020, 57(15): 153003

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