高炉浓尘环境料面散射特性建模与成像

doi:10.12305/j.issn.1001-506X.2023.05.03

Abstract

Abstract:

In harsh industrial environments, radar imaging is subject to low contrast and blurred target outlines. The affected quality of the radar imaging can interfere the results of computer vision tasks and cause errors in the results of parameter inversion. In this paper, the back-scattering characteristics of blast furnace burden surface are modeled, and an imaging algorithm based on attenuation compensation and scatter correction is proposed to improve the image quality of random rough surface in a dense dust environment. Considering the propagation loss of microwave along the path, environmental factors are added to the echo model. The attenuation coefficient and the back-scattering coefficient are obtained by Rayleigh scattering and integral equation methods. Based on the transmission loss and scattering mechanism, the target pixel values are compensated, so that the contrast between the target and the background is improved. Differences in pixel values due to the imaging environment, objects at different distances, and the degree of surface inclination are reduced by the prposed algorithm, which is verified by the No. 3 blast furnace radar data of Nanjing Iron and Steel. The target pixel brightness difference is reduced by 4.33 dB on average, and the object imaging is more uniform and clearer.

Key words: scattering characteristics, random rough surface, loss compensation, blast furnace burden surface imaging

CLC Number:

TN959.5

Qing YU, Qingwen HOU, Xianzhong CHEN. Scattering characteristics modeling and imaging of blast furnace burden surface in dusty environment[J]. Systems Engineering and Electronics, 2023, 45(5): 1277-1285.

Figures/Tables 15

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样本类型	δ	l
大颗粒铁矿石粗糙面	0.010 1	0.038
小颗粒铁矿石粗糙面	0.005 5	0.029
大颗粒焦炭粗糙面	0.027 9	0.064
小颗粒焦炭粗糙面	0.015 7	0.045

对象	参数	取值
雷达系统	雷达位置/m	x_radar=3.9, y_radar=5
	中心频率/GHz	23.86
	带宽/GHz	1.51
	扫描角度/(°)	61
	扫频数/次	77
	距离门宽度/m	0.995
	介电常数	1.5+5i
炉内粉尘参数	单位体积颗粒数/个	20 000
炉内粉尘参数	颗粒粒径/mm	0.1

算例	料批	粗糙度参数/m	几何模型系数(炉径=4.6 m)
料面1	小颗粒矿石	δ=0.005 5, l=0.029	a₁=-0.47, b₁=-5.12 a₂=0.16, b₂=-0.03, c₂=-5.69 a₃=0.12, b₃=-5.24
料面2	大颗粒矿石	δ=0.010 1, l=0.038	a₁=-0.68, b₁=-5.05 a₂=0.56, b₂=-1.55, c₂=-4.71 a₃=0.25, b₃=-6.01
料面3	小颗粒焦炭	δ=0.015 7, l=0.045	a₁=-0.54, b₁=-4.85 a₂=0.59, b₂=-1.81, c₂=-4.15 a₃=0.16, b₃=-5.48

像素亮度差	料面1	料面2	料面3
传统成像	14.80	19.37	15.26
损耗补偿	12.76	17.32	13.17
本文成像	9.74	14.45	12.26

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Scattering characteristics modeling and imaging of blast furnace burden surface in dusty environment

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