Material selection and design of beryllium-aluminum alloy mirror assembly for large-diameter space infrared camera

Mirror material	Density ρ/g·cm⁻³	Elastic modulus, E/GPa	Expansion coefficient/K	Conductivity, λ /W·m⁻¹·K⁻¹
Beryllium	1.85	287	11.3×10⁻⁶	216
AlBe alloy	2.1	190	13.9×10⁻⁶	212
CeSiC	3.04	330	2.4×10⁻⁶	170
Zerodure	2.53	92	−0.09×10⁻⁶	1.6
ULE	2.21	67	0.015×10⁻⁶	1.3

Table 2. Performance parameters of common space optical system lightweight material

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Table 2. Performance parameters of common space optical system lightweight material

Flexible structure material	Density ρ/g·cm⁻³	Elastic modulu, E/GPa	Expansion coefficient /K	Specific stiffness, E/ρ/m³
Aluminum alloy	2.7	68	22.5×10⁻⁶	−
AlBe alloy	2.1	190	13.9×10⁻⁶	9.5×10⁻⁶
Titanium	4.4	106.8	8.8×10⁻⁶	2.53
CeSiC	3.04	330	2.4×10⁻⁶	−
Al-Si/20SiLp	2.8	100	16×10⁻⁶	3.3×10⁻⁶
Al-Si/65SiLp	2.96	180	8.0×10⁻⁶	6.0×10⁻⁶

Table 3. Errors of main mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range
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Table 3. Errors of main mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range
Forces GX+△T15 ℃ GY+△T15 ℃ GZ+△T15 ℃
RMS/nm 14.77 17.04 14.16

Table 4. The first three order natural frequency of primary mirror part
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Table 4. The first three order natural frequency of primary mirror part
Modal Frequency/Hz
First order 299
Second order 300
Third order 387

Table 5. Modal analysis result of swing part in the constrainted condition
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Table 5. Modal analysis result of swing part in the constrainted condition
Modal First order Second order Third order
Frequency of swing part/Hz 122 284 287

Table 6. Errors of main mirror and second mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range
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Table 6. Errors of main mirror and second mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range
Forces GX+△T15 ℃ GY+△T15 ℃ GZ+△T15 ℃
RMS of the main mirror/nm 16.02 18.66 16.02
RMS of the second mirror/nm 16.42 13.44 18.09

Table 7. First time mechanical test results of slewing part
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Table 7. First time mechanical test results of slewing part
Direction X Y Z
F_n/Hz 118 280 282

Table 8. Mechanical test results of slewing part
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Table 8. Mechanical test results of slewing part
Direction X Y Z
F_n/Hz 118 277.8 278.2

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Zhai Yan, Jiang Huilin, Mei Gui, Jiang Fan. Material selection and design of beryllium-aluminum alloy mirror assembly for large-diameter space infrared camera[J]. Infrared and Laser Engineering, 2020, 49(6): 20190390

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Paper Information

Category: Optical design

Received: Feb. 6, 2020

Accepted: Mar. 10, 2020

Published Online: Sep. 21, 2020

The Author Email: Yan Zhai (zhaiy163@163.com)

DOI:10.3788/irla20190390

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Performance parameters of common space camera mirror material

Table 1. Performance parameters of common space camera mirror material

Table 2. Performance parameters of common space optical system lightweight material

Table 2. Performance parameters of common space optical system lightweight material

Table 3. Errors of main mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range

Table 3. Errors of main mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range

Table 4. The first three order natural frequency of primary mirror part

Table 4. The first three order natural frequency of primary mirror part

Table 5. Modal analysis result of swing part in the constrainted condition

Table 5. Modal analysis result of swing part in the constrainted condition

Table 6. Errors of main mirror and second mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range

Table 6. Errors of main mirror and second mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range

Table 7. First time mechanical test results of slewing part

Table 7. First time mechanical test results of slewing part

Table 8. Mechanical test results of slewing part

Table 8. Mechanical test results of slewing part

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