Laser & Optoelectronics Progress, Volume. 61, Issue 5, 0522003(2024)
Design of a High-Precision Repeatable Secondary Mirror Deployment Mechanism for Space Cameras
Figures & Tables(23)
Fig. 6. The equivalent model diagrams of the deployed mechanism. (a) Folded state; (b) intermediate state; (c) unfolded state
Fig. 8. Deformation-frequency curve along each axis under X-oriented acceleration
Fig. 9. Deformation-frequency curve along each axis under Y-oriented acceleration
Fig. 10. Deformation-frequency curve along each axis under Z-oriented acceleration
Table 1. Optical system parameters
View tableTable 1. Optical system parameters
Index Value Focal length /mm 3500 Spectral range /nm 450‒900 Field of view /（°×°） 1.68×0.1 Cell size /μm 3.5 Primary mirror calibre /mm 520.80 Secondary mirror calibre /mm 112.71 Distance between primary and secondary mirror /mm 602.73 Total length of optical system /mm 784.59
Table 2. Secondary mirror tolerance allocation results
View tableTable 2. Secondary mirror tolerance allocation results
Tolerance X-axis displacement /μm Y-axis displacement /μm Z-axis displacement /μm X-axis rotation /（″） Y-axis rotation /（″） Z-axis rotation /（″） Value 20 20 20 20 20″ 20″
Table 3. Material parameter
View tableTable 3. Material parameter
Parameter Titanium alloy Carbon fiber Density /（g·cm-3） 4.43 1.56 Elastic modulus /GPa 110 140 Micro yield stress /MPa 482 138 Linear expansivity /（10-6·K-1） 8.8 0.3 Thermal conductivity /（W·m-1·K-1） 7.2 35
Table 4. Theoretical error of secondary mirror deployment mechanism
View tableTable 4. Theoretical error of secondary mirror deployment mechanism
Index X-axis displacement /μm Y-axis displacement /μm Z-axis displacement /μm X-axis rotation /（″） Y-axis rotation /（″） Z-axis rotation /（″） Value 5.82 10.6 μm 2.78 μm 4.04 2.72 2.72
Table 5. Ultrasound motor parameters
View tableTable 5. Ultrasound motor parameters
Parameter Acrot orque /（N·m） Self-lock torque /（N·m） Range of speeds of rotation /（r/min） Value 1.6 1.2 4‒150
Table 6. The first six natural frequencies and mode shapes
View tableTable 6. The first six natural frequencies and mode shapes
Order Frequency /Hz Mode shape 1 96.64 Twist around the X-axis 2 111.68 Twist around the Z-axis 3 156.87 Translate along the Y-axis 4 188.53 Twist around the Z-axis 5 242.59 Twist around the Z-axis 6 659.03 Twist around the X-axis
Table 7. Acceleration in each frequency band［17］
View tableTable 7. Acceleration in each frequency band［17］
Frequency band /Hz 0‒70 70‒100 100‒120 Amplitude of acceleration 0.005g 0.004g 0.007g
Table 8. The amount of change in each degree of freedom
View tableTable 8. The amount of change in each degree of freedom
Serial number ΔX /μm ΔY /μm ΔZ /μm Δα /（″） Δβ /（″） Δγ /（″） 1 -13.50 32.00 13.60 0.72 -10.80 9.36 2 -17.70 -3.60 10.20 -20.24 27.72 -4.68 3 -21.30 23.00 -0.10 -0.72 -4.32 -1.80 4 17.30 -21.40 -3.20 23.12 -11.16 -34.20 5 14.90 24.50 11.10 11.16 -13.32 7.92 6 -12.80 20.10 9.40 -16.92 7.92 9.00 7 20.70 19.70 -13.80 27.00 -9.36 -20.52 8 -11.90 14.50 12.30 22.68 -25.56 5.76 9 12.10 -10.70 7.40 -1.80 14.04 3.96 10 -19.20 16.90 10.90 34.56 -30.24 -24.84 E -3.14 11.50 5.78 7.96 -5.51 -5.00 δlim ±15.37 ±15.61 ±7.90 ±16.89 ±15.94 ±14.28
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Junwei Song, Xiaoping Tao, Minglin Xu, Xun Wang. Design of a High-Precision Repeatable Secondary Mirror Deployment Mechanism for Space Cameras[J]. Laser & Optoelectronics Progress, 2024, 61(5): 0522003
Paper Information
Category: Optical Design and Fabrication
Received: Apr. 14, 2023
Accepted: May. 9, 2023
Published Online: Mar. 5, 2024
The Author Email: Xun Wang (wangxun7789@163.com)
CSTR:32186.14.LOP231083
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