Researching | Thermal Characteristics Analysis and Verification of Primary Supporting Structure for Spaceborne Camera Based on Low Volume SiC/Al Primary Mirror Frame

Acta Photonica Sinica, Volume. 50, Issue 4, 207(2021)

Thermal Characteristics Analysis and Verification of Primary Supporting Structure for Spaceborne Camera Based on Low Volume SiC/Al Primary Mirror Frame

Weiyan LI1...2, Qunbo LÜ1,2,3, Yangyang LIU1,2,3, Zheng TAN1,2, Jianwei WANG1,2, Na ZHAO1,2,3, Linlin PEI1,2, Jianying SUN1,2, and Xinwen CHEN12 |Show fewer author(s)

Author Affiliations

¹Aerospace Information Research Institute， Chinese Academy of Sciences， Beijing00094， China

²Key Laboratory of Computational Optical Imagine Technology， CAS， Beijing100094， China

³University of the Chinese of Academy of Science， Beijing100094， China

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Figures&Tables (19)

References (20)

Paper Information

Figures & Tables(19)

Fig. 1. Supporting structures used for spaceborne camera

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Fig. 2. Optical structure used for verification

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Fig. 3. Three-dimensional structure of primary mirror frame

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Fig. 4. Topology optimization of primary mirror frame

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Fig. 5. Optimized primary mirror frame

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Fig. 6. Primary mirror deformation (TC4 primary frame)

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Fig. 7. Primary mirror deformation (SiC/Al primary frame)

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Fig. 8. TC4 primary mirror frame temperature

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Fig. 9. SiC/Al primary mirror frame temperature

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Fig. 10. Camera MTF (TC4 primary mirror frame)

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Fig. 11. Camera MTF (SiC/Al primary mirror frame)

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Fig. 12. Position of main frame temperature measuring point

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Fig. 13. Spaceborne camera thermo-optic experiment

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Fig. 14. Target image of camera assembled

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Fig. 15. Target image of thermo-optic experiment

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Table 1. Spaceborne camera parameters used for verification
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Table 1. Spaceborne camera parameters used for verification
Type Index
Orbit height/km 700
Width/km ≥20
Original spatial⁃resolution/m 2.8
Processed spatial⁃resolution/m 1.4
Spectral range/nm 450~900
Primary size/mm 300
Weight/kg ≤23
Space size/mm ≤φ400×900

Table 2. Material properties for spaceborne camera

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Table 2. Material properties for spaceborne camera

Material	Density $ρ$ /(g·cm^-3)	Elastic modulus $E$ /Gpa	Thermal conductivity $λ$ /(W·m^-1·K)	Coefficient of Thermal expansion $α$ /(×10^-6℃^-1)
Al	2.78	70	120	22.7
TC4	4.44	114	6.8	9.2
15%SiC/Al	2.84	97	140	17
4J32	8.1	141	13.9	0.65

Table 3. Material Performance factors
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Table 3. Material Performance factors
Material
Specific stiffness
$E / ρ$
Thermal stability
$λ / α$
Performance factors
$(E / ρ) (λ / α)$
Al 25.2 5.3 133.6
TC4 25.7 0.7 18
15%SiC/Al 34.2 8.2 280.4
4J32 17.4 21.4 372.4

Table 4. Temperature date of primary mirror frame thermo-optic experiment

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Table 4. Temperature date of primary mirror frame thermo-optic experiment

Measuring point 1	Measuring point 2	Measuring point 3	Average temperature/℃
22.0	21.8	22.2	22.0
21.9	21.6	22.1	21.9
21.8	21.6	22.0	21.8
21.6	21.4	21.9	21.6
21.6	21.4	21.8	21.6
21.1	20.9	21.2	21.1
21.1	20.9	21.3	21.1
21.1	21.0	21.3	21.1
21.3	21.1	21.4	21.3
21.3	21.1	21.5	21.3
21.5	21.3	21.6	21.5

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Weiyan LI, Qunbo LÜ, Yangyang LIU, Zheng TAN, Jianwei WANG, Na ZHAO, Linlin PEI, Jianying SUN, Xinwen CHEN. Thermal Characteristics Analysis and Verification of Primary Supporting Structure for Spaceborne Camera Based on Low Volume SiC/Al Primary Mirror Frame[J]. Acta Photonica Sinica, 2021, 50(4): 207

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Paper Information

Category: Instrumentation, Measurement and Metrology

Received: Sep. 24, 2020

Accepted: Dec. 8, 2020

Published Online: May. 11, 2021

The Author Email:

DOI:10.3788/gzxb20215004.0412001

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology