Adaptive thermal refocusing system for a high-resolution space camera

Weiyan Li; Weiyan Li; Weiyan Li; Qunbo Lv; Qunbo Lv; Qunbo Lv; Na Zhao; Na Zhao; Na Zhao; Jianwei Wang; Jianwei Wang; Yangyang Liu; Yangyang Liu; Yangyang Liu; Tan Zheng; Tan Zheng; Tan Zheng

doi:10.1364/AO.443838

Applied Optics
Vol. 61,
Issue 3,
pp. 699-709
(2022)
•https://doi.org/10.1364/AO.443838

Adaptive thermal refocusing system for a high-resolution space camera

Weiyan Li, Qunbo Lv, Na Zhao, Jianwei Wang, Yangyang Liu, and Tan Zheng

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Weiyan Li, Qunbo Lv, Na Zhao, Jianwei Wang, Yangyang Liu, and Tan Zheng, "Adaptive thermal refocusing system for a high-resolution space camera," Appl. Opt. 61, 699-709 (2022)

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Abstract

To solve the problem of camera imaging quality degradation caused by defocusing during on-orbit operation, we propose an adaptive thermal refocusing system for high-resolution space cameras—the system comprising active and passive thermal refocusing. Using a space camera with a Ritchey–Chretien optical system as an example, the secondary mirror assembly was determined to be a passive thermal refocusing system, the primary mirror assembly being an active thermal refocusing system. We analyzed the system through structure/thermal/optics performance simulation when temperature variation $\Delta T$ was 5°C, 10°C, and 15°C; thermal vacuum experiments verified that the axial displacement of the active system was 0.0032, 0.0061, and 0.0090 mm, and the passive system was 0.00015, 0.00030, and 0.00069 mm, respectively. The data demonstrated the adaptive refocusing system theory to be consistent with the simulations and experiment, exhibiting high stability and reliability.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Parameter	Useful Zone (mm)	Mirror Shape	Material	Expansion Coefficient $10^{- 6} /^{\circ} C$	Curvature Radius (mm)	Weight (Kg)
Primary mirror	$ϕ$ 300	Concave aspherical	Zerodur	0.05	911.01	5
Second mirror	$ϕ$ 105	Convex aspherical	Zerodur	0.05	−350.20	0.7

Name	$r_{1}$	$r_{2}$	$r_{3}$	$r_{4}$	$r_{5}$	$r_{6}$	$L_{1}$	$L_{2}$	$L_{3}$	$L_{4}$
Sensitivity rate (%)	30	35	0.51	0.35	0.45	0.8	30	1.9	0.28	0.44

Design Temperature (°C)	Actual Temperature (°C)	Without Refocus MTF	Design Displacement (mm)	Actual Displacement (mm)	With Refocus MTF
5	5.1	0.05	0.0012	0.0015	0.11
7	7.2	0.06	0.0012	0.0014	0.11
9	8.9	0.07	0.0012	0.0014	0.11
11	11.1	0.08	0.0012	0.0013	0.11
13	13.2	0.08	0.0012	0.0011	0.12
15	14.8	0.10	0.0012	0.0013	0.12
17	17.1	0.11	0.0012	0.0012	0.12
19	19.3	0.11	0.0012	0.0015	0.12
21	21.1	0.12	0	0	0.12
23	22.8	0.11	0.0012	0.0011	0.12
25	25.2	0.10	0.0012	0.001	0.12
27	27.3	0.10	0.0012	0.0014	0.12
29	29.0	0.09	0.0012	0.0012	0.12
31	30.9	0.08	0.0012	0.001	0.11
33	32.8	0.07	0.0012	0.0009	0.11
35	35.1	0.05	0.0012	0.0011	0.11

Design Temperature (°C)	MTF	Spider Temperature (°C)	Refocusing Ring Temperature (°C)	Secondary Mirror Support Temperature (°C)
5	0.08	5.2	5.3	4.9
7	0.08	7.1	7.2	7.1
9	0.09	9.2	9.1	9.0
11	0.09	11.0	11.3	11.2
13	0.10	13.1	13.1	13.3
15	0.11	15.3	15.2	15.3
17	0.11	17.2	17.2	17.1
19	0.11	19.3	19.2	19.2
21	0.12	21.1	21.2	21.2
23	0.11	23.2	23.1	23.1
25	0.11	25.1	25.1	25.2
27	0.11	27.1	27.1	27.2
29	0.11	29.2	29.1	29.4
31	0.10	30.8	31.1	31.2
33	0.09	33.1	32.8	33.0
35	0.09	35.1	35.2	35.1

Parameter	Useful Zone (mm)	Mirror Shape	Material	Expansion Coefficient $10^{- 6} /^{\circ} C$	Curvature Radius (mm)	Weight (Kg)
Primary mirror	$ϕ$ 300	Concave aspherical	Zerodur	0.05	911.01	5
Second mirror	$ϕ$ 105	Convex aspherical	Zerodur	0.05	−350.20	0.7

Abstract

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Equations (2)

Applied Optics