Stray Light Suppression of Space Off-Axis Reflective CCD Camera

Ke Li; Yuanyuan Wang; Junlei Chang; Qinglin Li; Nan Zhang; Tingcheng Zhang; Lin Yao

doi:10.3788/LOP57.032902

Journals >Laser & Optoelectronics Progress >Volume 57 >Issue 3 >Page 032902 > Article

Laser & Optoelectronics Progress
Vol. 57, Issue 3, 032902 (2020)

Stray Light Suppression of Space Off-Axis Reflective CCD Camera

Ke Li^*, Yuanyuan Wang, Junlei Chang, Qinglin Li, Nan Zhang, Tingcheng Zhang, and Lin Yao

Author Affiliations

Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China

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DOI: 10.3788/LOP57.032902 Cite this Article Set citation alerts

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 Copy Citation Text

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Fig. 1. Optical design of space off-axis reflective CCD camera

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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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Fig. 4. Suppression structure for stray light. (a) Diaphragm; (b) inner shade; (c) diaphragm on focal plane

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Fig. 5. Structural diagram for stray light suppression

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Fig. 6. PST curve

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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

Table 1. Surface properties of stray light simulation design

No.	Path	Stray light coefficient /%
No.	Path	Channel 1	Channel 2
1	Path 1	20.72	—
2	Path 2	—	2.15
3	Path 3	4.40	—

Table 2. Summary of stray light path in space camera

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

Table 3. Simulation results of stray light coefficient for different lengths of diaphragm

No.	Off-axisangle /(°)	E₀ /(W·m^-2)	E_i /(W·m^-2)	log X_PST	No.	Off-axisangle /(°)	E₀ /(W·m^-2)	E_i /(W·m^-2)	log X_PST
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

Table 4. Statistics of calculation results of PST

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