Infrared Polarization Imaging Simulation of Sea Scenes Based on Improved Polarized Bidirectional Reflectivity Distribution Function

Chang TAN; Shiyong WANG; Sili GAO; Li CHEN; Weilin CHEN; Liya QIU

doi:10.3788/gzxb20225106.0611001

Journals >Acta Photonica Sinica >Volume 51 >Issue 6 >Page 0611001 > Article

Acta Photonica Sinica
Vol. 51, Issue 6, 0611001 (2022)

Infrared Polarization Imaging Simulation of Sea Scenes Based on Improved Polarized Bidirectional Reflectivity Distribution Function

Chang TAN^1、2、3, Shiyong WANG^1、2、*, Sili GAO^1、2, Li CHEN^1、2、3, Weilin CHEN^1、2、3, and Liya QIU^1、2、3

Author Affiliations

¹Shanghai Institute of Technical Physics，Chinese Academy of Sciences，Shanghai 200083，China

²Key Laboratory of Infrared Detection and Imaging Technology，Chinese Academy of Sciences，Shanghai 200083，China

³University of Chinese Academy of Sciences，Beijing 100049，China

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DOI: 10.3788/gzxb20225106.0611001 Cite this Article

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 Copy Citation Text

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Fig. 1. Sea surface 3D model generated from P-M wave spectrum

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Fig. 2. Three dimensional geometric model of ship

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Fig. 3. Schematic diagram of radiation transmission

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Fig. 4. Intermediate vector diagram

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Fig. 5. Simulated and measured images of ship and sea surface

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Fig. 6. Gray distribution of simulated and measured polarization images

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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 1. Data structure of model file

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Material	σ	B	n	k	ρ_d	ρ_v
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 2. Material properties of ship and sea surface

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Detection angle/（°）

Spontaneous emissivity

Reflectance

S₀

S₁

S₂

S₀

S₁

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

-0.020

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 3. Hemispherical spatially polarized spontaneous emissivity and reflectance of sea surface

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Detection angle/（°）

Spontaneous emissivity

Reflectance

S₀

S₁

S₂

S₀

S₁

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 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 4. Hemispherical spatially polarized spontaneous emissivity and reflectance of ship

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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

0.032 6

0.02

0.9~1.7

1.06+i0.002

1.6+i12.699

290

310

30，250

180

1.69

Table 5. Simulation parameter setting

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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

Table 6. Comparison of simulation time saving

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