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In an adaptive optical system, the optimal modal control method refers to applying proportional integral control of different bandwidths to the wavefront aberrations after modal decomposition to achieve better closed-loop results than the unified bandwidth modal control. The optimal modal gain usually needs to be obtained by ergodic solution based on the transfer function model of the adaptive optical system, the measured disturbance power spectral density, and the noise power spectral density, which usually takes a long time. Owing to the time-varying statistical characteristics of atmospheric turbulence, it is difficult to ensure the timeliness of the optimal modal gain. Therefore, we propose a method of fast estimating optimal modal gain based on quadratic polynomial fitting. In the method, it is only necessary to choose three reasonable gain coefficients and calculate their corresponding closed-loop residual errors respectively in order to estimate the optimal gain of single mode. The simulated slope data used in this work are cited from Lijiang 1.8 m adaptive telescope system, which consists of a 241-unit deformable secondary mirror and a Shaker-Hartmann wavefront sensor with 192 sub-apertures, with the first 135-order modes corrected by modal method. Our experiment is to test directly on-line on this system. The results show that under the same atmospheric environment, the proposed method can accurately estimate the optimal modal gain in a very short time and effectively suppress the high-order wavefront aberration. At the same time, owing to the reduced time complexity of the algorithm, the improved optimal modal gain estimation method takes only 0.33 s. Comparatively, it will take 7.08 s to obtain the optimal modal gain coefficient by using the parameter traversal method. Therefore the time spent on obtaining the optimal modal gain is shortened by about 95.3%, which is easier to meet the real-time requirements of the telescope, and beneficial to the adaptive optics system with more high-order modes. For the future adaptive optics system with more than one-thousand units, the proposed method can update the optimal gain to the second level, while the traversal method can only reach the minute level.
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Keywords:
- adaptive optics /
- wavefront control /
- optimal modal gain
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Google Scholar
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Google Scholar
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图 1 增益系数与Zernike模式时域误差的关系
Figure 1. Relations between gain and Zernike modal error.
图 2 最优模式增益快速估计流程图
Figure 2. Fast estimation of optimal modal gain.
图 3 UDSM-241结构图
Figure 3. Sketch of the UDSM-241.
图 4 夏克-哈特曼波前传感器子孔径的分布图
Figure 4. Sub-aperture layout of the Shack-Hartmann wavefront sensor.
图 5 高阶模式对应的最优增益系数和最优控制带宽(仿真)
Figure 5. Optimal gain and control bandwidth of higher-order modes (simulation).
图 6 第6, 15, 35, 65项模式的整体拟合结果
Figure 6. Overall fitting results of models 6, 15, 35 and 65.
图 7 高阶各项模式最优增益系数的拟合对比(仿真)
Figure 7. Comparison of optimal gain of higher-order modes (simulation).
图 8 Zernike模式波前像差及大气相干长度
$ {r}_{0} $ = 3.3 cmFigure 8. Zernike wavefront error and atmospheric coherence length
$ {r}_{0} $ = 3.3 cm.
图 9 高阶模式对应的最优增益系数和最优控制带宽(实验)
Figure 9. Optimal gain and control bandwidth of higher-order modes (experiment).
图 10 高阶各项模式最优增益系数的拟合对比(实验)
Figure 10. Comparison of optimal gain of higher-order modes (experiment).
图 11 PSD曲线(a)和CPSD (b)曲线对比
Figure 11. Comparison of PSD (a) curves and CPSD (b) curves
图 12 误差传递函数曲线对比
Figure 12. Comparison of error transfer function curves.
图 13 高阶波前像差RMS值的比较
Figure 13. Comparison of RMS values of higher-order wavefront aberration.
表 1 不同增益系数下波前误差RMS值对比
Table 1. Comparison of wavefront RMS value with different gain.
增益系数 开环 0.1 0.2 0.3 0.4 0.5 波前误差 RMS/nm 580.4 109.8 102.6 105.9 118.5 151.6 
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[1] 姜文汉 2018 光电工程 45 7
Google Scholar
Jiang W H 2018 Opto. Electron. Eng. 45 7
Google Scholar
[2] 饶长辉, 朱磊, 张兰强, 饶学军, 鲍华, 孔林, 郭友明, 钟立波, 马学安, 李梅, 王成, 张小军, 樊新龙, 王晓云, 凡木文, 陈东红, 冯忠毅 2018 光电工程 45 22
Google Scholar
Rao C H, Zhu L, Zhang L Q, Rao X J, Bao H, Kong L, Guo Y M, Zhong L B, Ma X A, Li M, Wang C, Zhang X J, Fan X L, Wang X Y, Fan M W, Chen D H, Feng Z Y 2018 Opto. Electron. Eng 45 22
Google Scholar
[3] Rao C H, Gu N T, Rao X J, et al. 2020 Sci. China-Phys. Mech. Astron. 63 109631
Google Scholar
[4] Luo Q, Huang L H, Gu N T, Rao C H 2012 Chin. Phys. B 21 094201
Google Scholar
[5] Guo Y M, Zhong L B, Min L, Wang J Y, Wu Y, Chen K L, Wei K, Rao C H 2022 Opto-Electron. Adv. 5 200082
Google Scholar
[6] 宁禹, 余浩, 周虹, 饶长辉, 姜文汉 2009 物理学报 58 4717
Google Scholar
Ning Y, Yu H, Zhou H, Rao C H, Jiang W H 2009 Acta Phys. Sin. 58 4717
Google Scholar
[7] 李新阳, 姜文汉, 王春红, 鲜浩 2001 光学学报 21 283
Google Scholar
Li X Y, Jiang W H, Wang C H, Xian H 2001 Acta Opt. Sin. 21 283
Google Scholar
[8] 颜召军, 李新阳, 饶长辉 2011 光学学报 31 0101003
Google Scholar
Yan Z J, Li X Y, Rao C H 2011 Acta Opt. Sin. 31 0101003
Google Scholar
[9] 颜召军, 李新阳, 饶长辉 2013 光学学报 33 0301002
Google Scholar
Yan Z J, Li X Y, Rao C H 2013 Acta Opt. Sin. 33 0301002
Google Scholar
[10] Gendron E, Léna P 1994 Astron. Astrophys. 291 337
[11] Gendron E, Léna P 1995 Astron. Astrophys. Suppl. S. 111 153
[12] Dessenne C, Madec P Y, Rousset G 1997 Opt. Lett. 22 1535
Google Scholar
[13] Dessenne C, Madec P Y, Rousset G 1998 Appl. Opt. 37 4623
Google Scholar
[14] Poyneer L A, Palmer D W, Macintosh B, et al. 2016 Appl. Opt. 55 323
Google Scholar
[15] Wang J Y, Guo Y M, Kong L, Zhang L Q, Gu N T, Chen K L, Rao C H 2020 Monthly Notices of the Royal Astronomical Society 496 5126
Google Scholar
[16] 王佳英, 郭友明, 孔林, 陈克乐, 饶长辉 2020 激光与光电子学进展 57 230101
Google Scholar
Wang J Y, Guo Y M, Kong L, Chen K L, Rao C H 2020 Laser & Optoelectr. Pro. 57 230101
Google Scholar
[17] Noll R 1976 J. Opt. Soc. Am. A 66 207
Google Scholar
[18] 高玮玮, 沈建新, 李邦明, 梁春 2010 光谱学与光谱分析 30 2232
Google Scholar
Gao W W, Shen J C, Li B M, Liang C 2010 Spectrosc. Spect. Anal. 30 2232
Google Scholar
[19] 郭友明, 马晓燠, 饶长辉 2014 物理学报 63 069502
Google Scholar
Guo Y M, Ma X Y, Rao C H 2014 Acta Phys. Sin. 63 069502
Google Scholar
[20] 饶长辉, 姜文汉 1996 强激光与粒子束 8 469
Rao C H, Jiang W H 1996 High Power Laser Partic. Beams 8 469
[21] 李新阳, 姜文汉 2000 光学学报 20 1328
Google Scholar
Li X Y, Jiang W H 2000 Acta Opt. Sin. 20 1328
Google Scholar
[22] Wei K, Zhang X J, Xian H, Ma W L, Zhang A, Zhou L C, Guan C L, Li M, Chen D H, Chen S Q, Liao Z, Rao C H, Zhang Y D 2010 Chin. Opt. Lett. 8 1019
Google Scholar
[23] Guo Y M, Zhang A, Fan X L, Rao C H, Wei L, Xian H, Wei K, Zhang X J, Guan C L, Li M, Zhou L C, Jin K, Zhang J B, Deng J J, Zhou L F, Chen H, Zhang X J, Zhang Y D 2016 Opt. Lett. 41 5712
Google Scholar
[24] Guo Y M, Wu Y, Li Y, Rao X J, Rao C H 2022 MNRAS 510 4347
Google Scholar
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