空间离轴反射式CCD相机杂散光抑制 
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Stray Light Suppression of Space Off-Axis Reflective CCD Camera
图 & 表
图 1. 空间离轴反射式CCD相机光学设计
Fig. 1. Optical design of space off-axis reflective CCD camera
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图 3. 杂散光路径和照度图。(a)杂散光光路1;(b)杂散光光路2;(c)杂散光光路3
Fig. 3. Stray light paths and illumination diagrams. (a) Stray light path 1; (b) stray light path 2; (c) stray light path 3
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图 4. 杂散光抑制结构。(a)光阑片;(b)内遮光罩;(c)焦面光阑片
Fig. 4. Suppression structure for stray light. (a) Diaphragm; (b) inner shade; (c) diaphragm on focal plane
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图 5. 杂散光抑制结构图
Fig. 5. Structural diagram for stray light suppression
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表 1杂散光仿真设计表面属性
Table1. Surface properties of stray light simulation design
| No. | Component | Reflectivity | Scatteringcoefficient | Transmissivity |
|---|
| 1 | Primarymirror | 0.96 | 0.04 | 0 | | 2 | Secondarymirror | 0.96 | 0.04 | 0 | | 3 | Thirdmirror | 0.96 | 0.04 | 0 | | 4 | Reflectingprism | 0.96 | 0.04 | 0 | | 5 | Mainstructure | BRDFmeasureddata | | |
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表 2空间相机杂散光路径汇总表
Table2. Summary of stray light path in space camera
| No. | Path | Stray light coefficient /% |
|---|
| Channel 1 | Channel 2 |
|---|
| 1 | Path 1 | 20.72 | — | | 2 | Path 2 | — | 2.15 | | 3 | Path 3 | 4.40 | — |
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表 3不同光阑片长度下的杂散光系数仿真结果
Table3. Simulation results of stray light coefficient for different lengths of diaphragm
| No. | Lengthof innershade /mm | Stray light coefficient for different lengths of diaphragm /% |
|---|
| 410 mm | 420 mm | 430 mm | 440 mm |
|---|
| Channel 1 | Channel 2 | Channel 1 | Channel 2 | Channel 1 | Channel 2 | Channel 1 | Channel 2 | | 1 | 190 | 23.60 | 2.08 | 23.67 | 2.08 | 20.04 | 1.83 | 1.20 | 1.26 | | 2 | 195 | 22.34 | 1.37 | 22.34 | 1.37 | 13.78 | 1.15 | 1.20 | 1.15 | | 3 | 200 | 16.08 | 1.29 | 6.71 | 1.29 | 1.36 | 1.13 | 1.20 | 1.13 | | 4 | 205 | 5.40 | 0.87 | 1.86 | 0.87 | 1.20 | 0.73 | 1.20 | 0.73 |
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表 4PST计算结果统计
Table4. Statistics of calculation results of PST
| No. | Off-axisangle /(°) | E0 /(W·m-2) | Ei /(W·m-2) | log XPST | No. | Off-axisangle /(°) | E0 /(W·m-2) | Ei /(W·m-2) | log XPST |
|---|
| 1 | 5 | 1.04×105 | 5.90×103 | -1.25 | 20 | 44 | 5.26×104 | 1.32×10-3 | -7.60 | | 2 | 8 | 1.03×105 | 2.25×101 | -3.66 | 21 | 46 | 5.26×104 | 1.20×10-3 | -7.64 | | 3 | 10 | 1.01×105 | 2.40×100 | -4.62 | 22 | 48 | 4.99×104 | 1.16×10-3 | -7.63 | | 4 | 12 | 9.83×104 | 1.32×100 | -4.87 | 23 | 50 | 4.71×104 | 1.11×10-3 | -7.63 | | 5 | 14 | 9.58×104 | 5.40×10-1 | -5.25 | 24 | 52 | 4.44×104 | 1.03×10-3 | -7.63 | | 6 | 16 | 9.33×104 | 4.50×10-1 | -5.32 | 25 | 54 | 4.16×104 | 1.00×10-3 | -7.62 | | 7 | 18 | 9.08×104 | 2.05×10-1 | -5.65 | 26 | 56 | 3.89×104 | 1.00×10-3 | -7.59 | | 8 | 20 | 8.82×104 | 4.30×10-2 | -6.31 | 27 | 58 | 3.63×104 | 7.87×10-4 | -7.66 | | 9 | 22 | 8.56×104 | 4.30×10-2 | -6.30 | 28 | 60 | 3.36×104 | 7.61×10-4 | -7.64 | | 10 | 24 | 8.29×104 | 4.16×10-2 | -6.30 | 29 | 62 | 3.10×104 | 2.56×10-4 | -8.08 | | 11 | 26 | 8.02×104 | 1.70×10-2 | -6.67 | 30 | 64 | 2.84×104 | 2.26×10-4 | -8.10 | | 12 | 28 | 7.75×104 | 8.82×10-3 | -6.94 | 31 | 66 | 2.58×104 | 9.39×10-5 | -8.44 | | 13 | 30 | 7.48×104 | 6.36×10-3 | -7.07 | 32 | 68 | 2.33×104 | 6.52×10-5 | -8.55 | | 14 | 32 | 7.21×104 | 4.46×10-3 | -7.21 | 33 | 70 | 2.09×104 | 6.74×10-5 | -8.49 | | 15 | 34 | 6.93×104 | 3.13×10-3 | -7.35 | 34 | 72 | 1.85×104 | 2.11×10-5 | -8.94 | | 16 | 36 | 6.66×104 | 2.26×10-3 | -7.47 | 35 | 74 | 1.61×104 | 1.99×10-5 | -8.91 | | 17 | 38 | 6.37×104 | 1.69×10-3 | -7.58 | 36 | 76 | 1.38×104 | 1.89×10-5 | -8.86 | | 18 | 40 | 6.09×104 | 1.41×10-3 | -7.64 | 37 | 78 | 1.15×104 | 1.43×10-5 | -8.91 | | 19 | 42 | 5.82×104 | 1.36×10-3 | -7.63 | 38 | 80 | 9.25×103 | 6.44×10-6 | -9.16 |
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李可, 王媛媛, 常君磊, 李庆林, 张楠, 张庭成, 姚林. 空间离轴反射式CCD相机杂散光抑制[J]. 激光与光电子学进展, 2020, 57(3): 032902. Ke Li, Yuanyuan Wang, Junlei Chang, Qinglin Li, Nan Zhang, Tingcheng Zhang, Lin Yao. Stray Light Suppression of Space Off-Axis Reflective CCD Camera[J]. Laser & Optoelectronics Progress, 2020, 57(3): 032902.
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