高分辨大视场紫外-可见光偏振成像融合处理技术 
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Ultraviolet-Visible Polarimetric Imaging and Image Fusion Technology with High Resolution and Large Field-of-View
1 中国科学院大学, 北京 100049
2 中国科学院上海技术物理研究所, 上海 200083
3 中国科学院红外探测与成像技术重点实验室, 上海 200083
图 & 表
图 1. 单次瑞利散射大气偏振态的多角度分布(圈为太阳位置,箭头表明散射光偏振方向)
Fig. 1. Multi-angle distribution of atmospheric polarization by single Rayleigh scattering (circle refers to the sun position and arrows refer to the angle of the polarization light)
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图 2. 不同波段的无偏光入射下偏振度与散射角的关系。(a)紫外;(b)可见光
Fig. 2. Relationship of polarization degree and scattering angle under incidence of unpolarized light at different wave bands. (a) UV; (b) visible light
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图 3. HITRAN96带宽响应条件下的偏振态仿真结果。(a)偏振度;(b)偏振角
Fig. 3. Simulation results of polarization state under condition of HITRAN96 bandwidth response. (a) Polarization degree; (b) polarization angle
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图 4. 紫外-可见光偏振成像系统功能框图
Fig. 4. Functional schematic of UV-visible light polarization imaging system
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图 5. 天空目标偏振成像伪彩图结果。(a)可见光强;(b)可见光偏振度;(c)可见光偏振角;(d)紫外偏振度;(e)紫外偏振角;(f)紫外-可见光融合偏振度;(g)紫外-可见光融合偏振角
Fig. 5. Sky target polarization images in pseudo color map. (a) Visible intensity; (b) visible polarization degree; (c) visible polarization angle; (d) UV polarization degree; (e) UV polarization angle; (f) UV-visible fusion polarization degree; (g) UV-visible fusion polarization angle
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图 6. 三个区域像素的偏振态统计分布。(a)偏振度;(b)偏振角
Fig. 6. Polarization statistical distributions of pixels in three regions. (a) Polarization degree; (b) polarization angle
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表 1城市地表气溶胶模型粒子谱参数及成分
Table1. Particle spectrum parameters and composition of urban surface aerosol model
| Aerosol model | Size distribution | Type |
|---|
| Ni | ri | σi |
|---|
| Urban | 0.999875 | 0.03 | 0.35 | Mixture of water soluble, dust-like aerosol, and soot-like aerosol | | 0.000125 | 0.50 | 0.40 |
|
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表 2紫外-可见光偏振成像系统参数
Table2. Parameters of UV-visible light polarization imaging system
| Parameter | UV module | Visible module |
|---|
| Sensitive wavelength /nm | 360-400 (peak at 380 nm) | 380-780 (peak at 520 nm) | | Polarization detection approach | rotating element | division of focal plane | | Total field of view /[(°)×(°)] | 8.7×6.4 | 19.6×16.4 | | Angular resolution /mrad | 0.23 | 0.28 | | Number of detected polarized directions | 4 | 4 | | Quantization bits | 14 | 12 | | Frame frequency /Hz | 20 | 24 | | SNR | 623.5(50% solar constant) | 101.5(50% solar constant) | | Polarization degree dynamic range | 0.1-0.9 | 0.05-0.95 | | Measurement error of linear polarization degree /% | <1.5 | <2.7 |
|
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表 3可见光和紫外光无云区和云区图像偏振度和偏振角统计结果
Table3. Statistical results of image polarization degree and polarization angle in cloud-free area and cloud area in UV and visible light
| Parameter | Cloudlessregion in visible | Cloudregion in visible | Cloudlessregion in UV | Cloudregion in UV | | | |
|---|
| DoP | AoP /(°) | DoP | AoP /(°) | DoP | AoP /(°) | DoP | AoP /(°) |
|---|
| Average | 0.060 | -52.1 | 0.060 | -60.9 | 0.07 | 86.4 | 0.090 | 84.7 | | Standard deviation | 0.010 | 8.7 | 0.010 | 4.1 | 0.03 | 14.2 | 0.020 | 5.7 | | Simulation result | 0.125 | 70.9 | 0.036 | 36.6 | 0.143 | 67.8 | 0.164 | 46.2 |
|
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李清灵, 尹达一, 庾金涛, 李磊. 高分辨大视场紫外-可见光偏振成像融合处理技术[J]. 光学学报, 2019, 39(6): 0611001. Qingling Li, Dayi Yin, Jintao Yu, Lei Li. Ultraviolet-Visible Polarimetric Imaging and Image Fusion Technology with High Resolution and Large Field-of-View[J]. Acta Optica Sinica, 2019, 39(6): 0611001.
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