Design of Optical System for Lightweight and Compact Low-Light Camera in Deep Space Exploration

No.	Parameter name	Requirement
1	Optimal imaging object distance /m	14
2	Spectral range /nm	430‒680
3	Field of view /［（°）×（°）］	45×45 （circular FOV： 61°）
4	Sensor resolution	2048×2048
5	Pixel size /（μm×μm）	11 ×11
6	Focal length /mm	27.2
7	Relative aperture	1/2
8	Distortion	≤3% for full FOV
9	MTF	0.9 normalized FOV： MTF>0.5 @ 45.5 lp/mm （design value at optimal object distance）
10	Relative illumination	Better than 60% across the full FOV
11	Temperature range /℃	Operating temperature： -40‒+55； storage temperature： -50‒+60

Table 2. Optical power distribution table

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Table 2. Optical power distribution table

No.	Name	Material	Optical power /mm^-1
1	Lens 1	Fused quartz	-0.0129	2.8800×10^-3	0.0412	0.0368
2	Lens 2	H-ZLAF89L	0.0147	2.8800×10^-3
3	Lens 3	H-LAF7	-0.0381	0.0379
4	Lens 4	H-ZPK2A	0.0107
5	Lens 5	H-ZLAF53B	0.0435
6	STO	‒	‒	‒	‒
7	Lens 6	H-ZPK2A	0.0111	-0.0156	-0.0198
8	Lens 7	H-ZF3	-0.0367	-0.0156
9	Lens 8	H-ZLAF50E	0.0212	-1.7960×10^-3
10	Lens 9	H-LAF53	-0.0389
11	Lens 10	H-ZF88	0.0120

Table 3. Parameters of the double cemented lens

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Table 3. Parameters of the double cemented lens

Lens No.	Lens material grade	Thermal expansion coefficient /（10^-6 ℃^-1）	Cemented surface radius of curvature /mm	Lens semi-aperture /mm
Lens 3	H-LAF7	8.0	20.014	12.5
Lens 4	H-ZPK2A	9.3	20.014	12.5
Lens 6	H-ZPK2A	9.3	-15.599	9.5
Lens 7	H-ZF3	9.0	-15.599	9.5

Table 4. Seidel coefficients

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Table 4. Seidel coefficients

Lens surface	Spherical aberration	Coma	Astigmatism	Field curvature	Distortion	Longitudinal color	Transversecolor
1	0.01440	0.00719	0.00359	0.15898	0.08119	-0.01137	-0.00568
2	-0.21316	0.18626	-0.16275	-0.30799	0.41132	0.02546	-0.02224
3	0.08499	0.03378	0.01343	0.23311	0.09800	-0.06074	-0.02414
4	-0.00077	-0.00385	-0.01913	-0.11924	-0.68809	0.01718	0.08542
5	-0.04231	0.11571	-0.31646	-0.25928	1.57462	0.04065	-0.11118
6	-0.19530	-0.00605	-0.00019	-0.05061	-0.00158	0.06504	0.00202
7	0.00148	-0.00456	0.01409	0.18889	-0.62713	-0.01417	0.04377
8	0.17681	0.15965	0.14415	0.25867	0.36371	-0.06985	-0.06307
9	0.33358	-0.44157	0.58452	0.13284	-0.94959	-0.07179	0.09504
STO	0	0	0	0	0	0	0
11	-0.00497	0.03723	-0.27917	0.18090	0.73691	0.00511	-0.03832
12	-0.15011	0.02913	-0.00565	-0.04360	0.00956	0.07306	-0.01418
13	0.00027	-0.00913	0.30816	-0.27066	-1.26492	-0.00291	0.09805
14	-0.01315	0.06443	-0.31583	0.11908	0.96440	0.01029	-0.05046
15	0.07742	-0.09827	0.12473	0.07244	-0.25028	-0.01753	0.02225
16	-0.07865	-0.05192	-0.03427	-0.52558	-0.36956	0.01135	0.00749
17	0.01902	-0.04530	0.10787	0.16185	-0.64228	-0.00642	0.01529
18	-0.01141	0.05856	-0.27587	0.09858	0.97918	0.01650	-0.08174
19	0.01269	-0.03900	0.11989	0	-0.36852	-0.01366	0.04199
20	-0.00285	0.00875	-0.02689	0	0.08266	0.00087	-0.00267
21	0.00140	-0.00430	0.01321	0	-0.04059	-0.00043	0.00131
IMA	0	0	0	0	0	0	0
TOT	0.00939	-0.00326	-0.00258	0.02839	0.09902	-0.00337	-0.00106

Table 5. Defocus amount at different temperatures
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Table 5. Defocus amount at different temperatures
Temperature /℃ Defocus amount /μm
20 0
-40 2.52
+55 -2.56

Table 6. Lens imaging quality measured data

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Table 6. Lens imaging quality measured data

Test item	Test result
Focal length /mm	27.31
0.9 normalized FOV MTF （at optimal object distance， characteristic frequency 45.5 lp/mm）	0.43
Maximum distortion （full field） /%	-2.83
Defocus amount at -40 ℃（at center field） /μm	3.30
Defocus amount at +55 ℃（at center field） /μm	-2.01

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Jingbo Tong, Baogui Zhang, Xingtai Feng, Ye Li, Yongfu Hu, Changning Huang. Design of Optical System for Lightweight and Compact Low-Light Camera in Deep Space Exploration[J]. Laser & Optoelectronics Progress, 2025, 62(13): 1322001

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