Design of <i>Φ</i>450 mm light-weighted SiC mirror subsystem in space-based astronomy telescope

Liangjie Feng; Pengfei Cheng; Wei Wang

doi:10.3788/IRLA20200175

Infrared and Laser Engineering, Volume. 50, Issue 2, 20200175(2021)

Design of Φ450 mm light-weighted SiC mirror subsystem in space-based astronomy telescope

Liangjie Feng, Pengfei Cheng, and Wei Wang

The Space Optical Technology Research Department, Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an 710119, China

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Table 1. [in Chinese]

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Table 1. [in Chinese]

	Be	Zerodur	ULE	Fused silica	RB SiC
Density/g·cm⁻³	1.85	2.53	2.21	2.19	3.1
Modulus/GPa	303	92	73	72	391
Poisson’s ration	0.043	0.24	0.17	0.17	0.25
Thermal conductivity/W·m⁻¹·K⁻¹	216	1.46	1.4	0.5	120-170
Expansion coefficient/K×10⁻⁶	11.4	0.05	0.03	2.9	2.5

Table 2. [in Chinese]
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Table 2. [in Chinese]
Parameters Ranges Steps Optimization results
L/mm 5-20 0.2 10
w/mm 5-15 0.2 8
t/mm 1-2 0.1 1.5
d/mm 10-25 0.5 21
φ/(°) 40-120 2 56

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Liangjie Feng, Pengfei Cheng, Wei Wang. Design of Φ450 mm light-weighted SiC mirror subsystem in space-based astronomy telescope[J]. Infrared and Laser Engineering, 2021, 50(2): 20200175

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