Laser & Optoelectronics Progress, Volume. 57, Issue 3, 032902(2020)
Stray Light Suppression of Space Off-Axis Reflective CCD Camera
Figures & Tables(9)
Fig. 3. Stray light paths and illumination diagrams. (a) Stray light path 1; (b) stray light path 2; (c) stray light path 3
Fig. 4. Suppression structure for stray light. (a) Diaphragm; (b) inner shade; (c) diaphragm on focal plane
Table 1. Surface properties of stray light simulation design
View tableTable 1. Surface properties of stray light simulation design
No. Component Reflectivity Scattering coefficient Transmissivity 1 Primary mirror 0.96 0.04 0 2 Secondary mirror 0.96 0.04 0 3 Third mirror 0.96 0.04 0 4 Reflecting prism 0.96 0.04 0 5 Main structure BRDF measured data
Table 2. Summary of stray light path in space camera
View tableTable 2. 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 —
Table 3. Simulation results of stray light coefficient for different lengths of diaphragm
View tableTable 3. Simulation results of stray light coefficient for different lengths of diaphragm
No. Length of inner shade /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
Table 4. Statistics of calculation results of PST
View tableTable 4. Statistics of calculation results of PST
No. Off-axis angle /(°) E0 /(W·m-2) Ei /(W·m-2) log XPST No. Off-axis angle /(°) 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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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
Paper Information
Category: Scattering
Received: Jun. 18, 2019
Accepted: Aug. 16, 2019
Published Online: Feb. 17, 2020
The Author Email: Ke Li (565544473@qq.com)
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