Infrared and Laser Engineering, Volume. 51, Issue 10, 20220303(2022)
Opto-mechanical structure design of vertical off-axis TMA system camera
Figures & Tables(15)
Fig. 2. 3D modal and order modal of main frame before optimization
Fig. 7. Single-degree-of-freedom vibration isolation system characteristic curve
Table 1. Effective passing aperture of mirrors
View tableView in ArticleTable 1. Effective passing aperture of mirrors
Mirror type X-direction effective passing aperture/mm Y-direction effective passing aperture/mm Primary mirror 456.9 226.9 Secondary mirror 106.0 106.0 Third mirror 377.8 148.9
Table 2. Surface accuracy of mirrors
View tableView in ArticleTable 2. Surface accuracy of mirrors
Primary mirror Secondary mirror Third mirror Surface accuracy (RMS)/nm 16 9 16
Table 3. Physical properties of typical mirror materials
View tableView in ArticleTable 3. Physical properties of typical mirror materials
ρ/g·cm–3 E/GPa E/ρ/GN·m·g–1 α/10−6 K–1 λ/W·m–1·K–1 α/λ/10–6 m·W–1 ULE 2.21 67 30.3 0.015 1.3 0.012 Zerodur 2.5 92 36.8 0.09 1.67 0.054 SiC 3.05 390 127.9 2.4 185 0.013
Table 4. Results of random vibration
View tableView in ArticleTable 4. Results of random vibration
Key points Direction Root mean square acceleration, grms Attenuation ratio Without vibration isolator With vibration isolator Top of main frame X 1.8 0.7 61% Y 1.7 0.6 65% Z 3.7 1.5 59% Bottom of main frame X 2.6 1.0 62% Y 2.2 0.7 68% Z 2.1 1.0 52%
Table 5. Conditions of random vibration
View tableView in ArticleTable 5. Conditions of random vibration
Frequency range/Hz Power spectral density/g2·Hz–1 20-190 0.00114-0.0107 190-500 0.0107 500-750 0.0079 750-2 000 0.0079-0.00042
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Qinglin Li, Yuanyuan Cai, Zhifei Zhang, Junlei Chang, Nan Zhang. Opto-mechanical structure design of vertical off-axis TMA system camera[J]. Infrared and Laser Engineering, 2022, 51(10): 20220303
Paper Information
Category: Optical design
Received: May. 5, 2022
Accepted: --
Published Online: Jan. 6, 2023
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