Infrared and Laser Engineering, Volume. 53, Issue 1, 20230412(2024)
Experiment study on large solar telescope mirror seeing
Figures & Tables(15)
Fig. 5. System overall layout (The hollow circles are SMD temperature sensors and air temperature sensors; the hollow cylinder is the ultrasonic wind direction and speed sensor; the red rectangle is the silicone rubber heating plate; the trapezoid is the electric fan)
Fig. 7. Test result diagram of
Fig. 8. Strehl Intensity as a function of mirror-air temperature difference for the 1550 mm mirror (The filled portion of the figure shows the error statistics for multiple sets of experimental data)
Fig. 9. FWHM as a function of mirror-air temperature difference for the 1550 mm mirror (The filled portion of the figure shows the error statistics for multiple sets of experimental data)
Fig. 10. Seeing as a function of mirror-air temperature difference for free convection
Fig. 11. FWHM/
Table 1. Equipment parameter list
View tableView in ArticleTable 1. Equipment parameter list
Species Parameter 4D interferometer Diameter: 9 mm; Focal length: 14 mm Working band: 632.8 nm Compensating mirror set Diameter: 82 mm; Material: H-K9L Flat 1 curvature radius: −154.88 mm Flat 2 curvature radius: −325.9 mm Distance between mirrors: −27.506 mm Large hyperboloid reflector primary mirror Diameter: 1550 mm; Off-axis distance: 1500 mm Material: glass-ceramic; Coating:enhanced aluminum Flat mirror Diameter: 1800 mm; RMS: λ/40 (632.8 nm) Material: glass-ceramic
Table 2. Summary of test results for free convection (Mirror velocity=0 m/s)
View tableView in ArticleTable 2. Summary of test results for free convection (Mirror velocity=0 m/s)
Model Mirror velocity/m·s−1 $ {\Delta T}_{m} $ $ {r}_{0} $ Strehl ratio FWHM/(″) Free convection U=0 0 20.67 0.98 0.03 0.2 12.40 0.97 0.05 0.5 4.77 0.88 0.13 0.8 1.94 0.71 0.32 1 1.48 0.62 0.42 1.5 1.13 0.51 0.55 2 0.89 0.40 0.70 2.5 0.74 0.31 0.84 3 0.64 0.22 0.97 3.5 0.55 0.17 1.18 4 0.43 0.15 1.43
Table 3. Summary of test results for forced convection at low wind speed (Mirror velocity=0.2 m/s) 1) the formula is applicable to
\begin{document}$ {\mathrm{\Delta }T}_{m} $\end{document} View tableView in ArticleTable 3. Summary of test results for forced convection at low wind speed (Mirror velocity=0.2 m/s) 1) the formula is applicable to
\begin{document}$ {\mathrm{\Delta }T}_{m} $\end{document} Model Mirror velocity/m·s−1 $ {\Delta T}_{m} $ $ {r}_{0} $ Strehl ratio FWHM/(″) $ {F}_{r} $ Forced convection U=0.2 0 18.51 0.98 0.03 \ 1) 0.2 15.60 0.97 0.04 0.18 0.5 8.86 0.92 0.07 0.36 0.8 2.99 0.78 0.21 0.18 1 2.18 0.72 0.28 0.22 1.5 1.75 0.62 0.36 0.40 2 1.65 0.59 0.38 0.84 2.5 1.52 0.54 0.41 1.39 3 1.41 0.50 0.44 1.92
Table 4. Summary of test results for forced convection at high wind speed (Mirror velocity=1.0 m/s) 1) the formula is applicable to
\begin{document}$ {{\Delta }T}_{m} $\end{document} View tableView in ArticleTable 4. Summary of test results for forced convection at high wind speed (Mirror velocity=1.0 m/s) 1) the formula is applicable to
\begin{document}$ {{\Delta }T}_{m} $\end{document} Model Mirror velocity/m·s−1 $ {\Delta T}_{m} $ $ {r}_{0} $ Strehl ratio FWHM/(″) $ {F}_{r} $ Forced convection U=1.0 0 15.38 0.94 0.04 \ 1) 0.2 21.46 0.96 0.03 0.06 0.5 18.75 0.96 0.03 0.92 0.8 14.61 0.94 0.04 4.23 1 12.66 0.91 0.05 2.93 1.5 4.04 0.89 0.15 6.63 2 3.07 0.83 0.20 6.77 2.5 2.64 0.79 0.24 8.84 3 2.30 0.74 0.27 10.8
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Yan Wang, Yongxing Yang, Jinpeng Li, Yong Bi, Qingsheng Zhu. Experiment study on large solar telescope mirror seeing[J]. Infrared and Laser Engineering, 2024, 53(1): 20230412
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Received: Aug. 1, 2023
Accepted: --
Published Online: Mar. 19, 2024
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