Acta Photonica Sinica, Volume. 51, Issue 6, 0611001(2022)
Infrared Polarization Imaging Simulation of Sea Scenes Based on Improved Polarized Bidirectional Reflectivity Distribution Function
Figures & Tables(12)
Fig. 6. Gray distribution of simulated and measured polarization images
Table 1. Data structure of model file
View tableView in ArticleTable 1. Data structure of model file
Name Content Target properties Target number Type of target：for example：01：sea surface；02：ship Number of sub modules：for example，the ship can be divided into deck，upper building and hull side Number of bin Number of vertices Number of material properties Attributes of the target sub module Sub module number，such as：01：deck；02：hull side； The starting index value of the sub module vertex in the total vertex Number of sub module vertices Starting index value of sub module bin in total bin Bin number of sub modules Sub module material attribute number Vertex list All vertices in the target Bin list Vertex index in each bin Attribute information Including complex refractive index and roughness
Table 2. Material properties of ship and sea surface
View tableView in ArticleTable 2. Material properties of ship and sea surface
Material σ B n k ρd ρv Sea 0.01 1.15 1.5 0.0 6.0×10-20 2.0×10-8 Ship 0.02 1.15 1.8 0.8 1.0×10-8 3.0×10-8
Table 3. Hemispherical spatially polarized spontaneous emissivity and reflectance of sea surface
View tableView in ArticleTable 3. Hemispherical spatially polarized spontaneous emissivity and reflectance of sea surface
Detection angle/（°） Spontaneous emissivity Reflectance S0 S1 S2 S0 S1 0
10
20
30
40
50
60
70
1.100
0.942
0.924
0.906
0.857
0.912
0.852
0.740
0.025
-0.010
-0.011
-0.029
-0.047
-0.075
-0.100
-0.140
0.020
0.010
0.010
-0.010
-0.020
0.030
0.010
-0.020
0.091 6
0.092 0
0.093 5
0.097 2
0.105 2
0.120 5
0.148 7
0.201 2
0.008 7
0.002 1
0.008 7
0.019 7
0.034 9
0.053 7
0.075 2
0.099 7
Table 4. Hemispherical spatially polarized spontaneous emissivity and reflectance of ship
View tableView in ArticleTable 4. Hemispherical spatially polarized spontaneous emissivity and reflectance of ship
Detection angle/（°） Spontaneous emissivity Reflectance S0 S1 S2 S0 S1 0
10
20
30
40
50
60
70
0.980
0.953
0.941
0.955
0.963
0.942
0.910
0.799
0.030
-0.019
-0.021
-0.038
-0.057
-0.093
-0.138
-0.212
-0.013
-0.012
-0.008
0.012
0.021
0.019
0.012
-0.030
0.070 1
0.070 1
0.070 6
0.072 9
0.080 2
0.099 6
0.147 2
0.258 1
0.000 4
0.002 7
0.011 4
0.026 9
0.050 9
0.085 4
0.130 9
0.180 8
Table 5. Simulation parameter setting
View tableView in ArticleTable 5. Simulation parameter setting
Parameter Assignment wind speed/（m·s-1）
Sea surface roughness
Ship surface roughness
Detection wavelength/μm
Seawater complex refractive index
Ship complex refractive index
Seawater temperature/K
Ship temperature/K
Solar elevation and azimuth/（°）
Detection direction angle/（°）
Detection angle/（°）
Detector focal length/mm
CCD size/cm
5
0.032 6
0.02
0.9~1.7
1.06+i0.002
1.6+i12.699
290
310
30，250
180
60
50
1.69
Table 6. Comparison of simulation time saving
View tableView in ArticleTable 6. Comparison of simulation time saving
Model Roughness Number of surfaces Saving time/ms Sea a 0.032 6 960 1 496 Sea b 0.032 6 1 974 3 968 Sea c 0.032 6 9 832 18 056 Ship a 0.02 574 988 Ship b 0.02 1 156 2 164 Ship c 0.02 2 038 3 906
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Chang TAN, Shiyong WANG, Sili GAO, Li CHEN, Weilin CHEN, Liya QIU. Infrared Polarization Imaging Simulation of Sea Scenes Based on Improved Polarized Bidirectional Reflectivity Distribution Function[J]. Acta Photonica Sinica, 2022, 51(6): 0611001
Paper Information
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Received: Nov. 24, 2021
Accepted: Feb. 15, 2022
Published Online: Sep. 23, 2022
The Author Email: WANG Shiyong (s_y_w@sina.com)
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