检索结果-南通市图书馆

同方期刊数据库

大气湍流外尺度对倾斜跟踪系统跟踪精度的影响

在线全文

学校读者我要写书评

暂无评论

光学学报 2007年第6期27卷 967-970页

作者：吴碧琳饶长辉中国科学院光电技术研究所

从G倾斜功率谱和倾斜跟踪残余误差两个方面分析了大气湍流外尺度对倾斜跟踪系统跟踪精度的影响。详细推导了G倾斜功率谱以及倾斜跟踪残差与大气湍流外尺度的函数关系式。数值计算结果表明大气湍流外尺度对G倾斜功率谱以及倾斜跟踪残余... 详细信息

从G倾斜功率谱和倾斜跟踪残余误差两个方面分析了大气湍流外尺度对倾斜跟踪系统跟踪精度的影响。详细推导了G倾斜功率谱以及倾斜跟踪残差与大气湍流外尺度的函数关系式。数值计算结果表明大气湍流外尺度对G倾斜功率谱以及倾斜跟踪残余误差的低频段影响较大,而对高频段的影响可以忽略不计。

关键词：大气光学倾斜跟踪系统大气湍流外尺度跟踪精度

根据远场光班确定夏克-哈特曼传感器采样率的一种方法

在线全文

学校读者我要写书评

暂无评论

光学学报 2009年第5期29卷 1137-1142页

作者：陈红丽饶长辉中国科学院光电技术研究所四川成都610209 中国科学院研究生院北京100039

提出了一种利用夏克-哈特曼波前传感器测量未知波前时确定其子孔径数目的新方法。首先将被测波前相位用傅里叶级数展开表示,然后对展开表达式的复振幅进行贝塞尔展开,并对它进行傅里叶变换计算出其远场光斑分布。分析表明,波前相位频谱... 详细信息

提出了一种利用夏克-哈特曼波前传感器测量未知波前时确定其子孔径数目的新方法。首先将被测波前相位用傅里叶级数展开表示,然后对展开表达式的复振幅进行贝塞尔展开,并对它进行傅里叶变换计算出其远场光斑分布。分析表明,波前相位频谱分量与远场光斑形态存在某种相互对应的关系,可根据采样定理通过远场光斑的分布界限确定出夏克-哈特曼波前传感器的采样率。该方法为夏克-哈特曼传感器对未知波前进行测量时其子合理孔径数目的确定提供了理论依据,有效避免了夏克-哈特曼传感器由于采样率不足而造成精度下降的问题,结束了在确定夏克-哈特曼波前传感器的子孔径数目时只依靠经验的状态。

关键词：自适应光学空间采样率傅里叶变换夏克-哈特曼波前传感器采样定理

High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2023年第12期6卷 15-26页

作者： Youming Guo Kele Chen Jiahui Zhou Zhengdai Li Wenyu Han Xuejun rao Hua Bao Jinsheng Yang Xinlong Fan changhui rao The Key Laboratory on Adaptive Optics Chinese Academy of SciencesChengdu 610209China Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China University of Chinese Academy of Sciences Beijing 100049China School of Electronic Electrical and Commutation EngineeringUniversity of Chinese Academy of ScienceBeijing 100049China National Key Laboratory of Optical Field Manipulation Science and Technology Chengdu 610209China.

Integrating deformable mirrors within the optical train of an adaptive telescope was one of the major innovations in astronomical observation technology,distinguished by its high optical throughput,reduced optical surfaces,and the incorporation of the deformable ***,voice-coil actuators are used,which require additional position sensors,internal control electronics,and cooling systems,leading to a very complex *** deformable secondary mirror technologies were proposed to overcome these ***,a high-order piezoelectric deformable secondary mirror has been developed and installed on the 1.8-m telescope at Lijiang Observatory in China to make it an adaptive *** system consists of a 241-actuator piezoelectric deformable secondary mirror,a 192-sub-aperture Shack-Hartmann wavefront sensor,and a multi-core-based real-time *** actuator spacing of the PDSM measures 19.3 mm,equivalent to approximately 12.6 cm when mapped onto the primary mirror,significantly less than the voicecoil-based adaptive telescopes such as LBT,Magellan and *** a result,stellar images with Strehl ratios above 0.49 in the R band have been *** our knowledge,these are the highest R band images captured by an adaptive telescope with deformable secondary ***,we report the system description and on-sky performance of this adaptive telescope.

关键词： adaptive optics deformable secondary mirror visible imaging

The Influence of Filter Slit on the Imaging Performance of the Solar Grating Spectrometer Based on Adaptive Optics

在线全文

学校读者我要写书评

暂无评论

Optics and Photonics Journal 2015年第10期5卷 303-311页

作者： Lianhui Zheng changhui rao Naiting Gu Qi Qiu Key Laboratory of Adaptive Optics Chinese Academy of Sciences Chengdu China School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu China University of Chinese Academy of Sciences Beijing China Institute of Optics and Electronics Chinese Academy of Sciences Chengdu China

The solar grating spectrometer is an essential tool to study the thermodynamics properties of the solar atmosphere with different height distributions, but its imaging performance will be degraded by the wavefront aberration generalized by the atmospheric turbulence. On the other hand, the narrow slit of the grating spectrometer will filter the wavefront aberration to some extent. The influence of the filter slit on the wavefront aberration and the correction requirement of the adaptive optics are analyzed theoretically and experimentally. We demonstrate that the influence of filter slit on the different types and magnitudes of wavefront aberration is different, and the RMS value of the wavefront aberration less than 0.3λ is down to below almost 60% after the filter slit, and it can lower the correction range requirement of the adaptive optics. The numerical simulation and experiment results show that: after the adaptive optics correction, the influence of the wavefront aberration on the spectral resolution is neglected, and the energy utilization is considerably improved;both numerical simulation and experiment results are in good agreement.

关键词： Solar Atmosphere Aberration Adaptive Optics Prototype Spectral Resolution

静态像差对交叉谱相位复原精度的影响及补偿方法

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

光学学报 2014年第7期34卷 12-19页

作者：钟立波田雨饶长辉中国科学院光电技术研究所四川成都610209 中国科学院自适应光学重点实验室四川成都610209 中国科学院大学北京100049

斑点图像重建方法可以有效抑制大气湍流的影响,得到目标衍射极限像。然而系统静态像差破坏了波前的统计信息,降低了相位重建精度。通过理论分析得出在理想情况下,离焦、像散、彗差和球差中只有彗差会在重建结果中引入额外相位值。进一... 详细信息

斑点图像重建方法可以有效抑制大气湍流的影响,得到目标衍射极限像。然而系统静态像差破坏了波前的统计信息,降低了相位重建精度。通过理论分析得出在理想情况下,离焦、像散、彗差和球差中只有彗差会在重建结果中引入额外相位值。进一步采用分割光瞳的方式表示交叉谱传递函数与静态像差的关系时,指出通过选择交叉谱的平移向量方向,可以实现在特定方向上静态像差之间的平衡,降低系统像差对相位重建的影响。仿真中球差与离焦像差之间的平衡及离焦像差与像散之间的平衡,都起到了降低相位重建误差的效果。

关键词：大气光学图像处理静态像差斑点干涉

大视场地表层自适应光学系统性能评估方法对比分析

在线全文

学校读者我要写书评

暂无评论

红外与激光工程 2022年第7期51卷 266-274页

作者：杨颖张兰强饶长辉中国科学院自适应光学重点实验室四川成都610209 中国科学院光电技术研究所四川成都610209 中国科学院大学北京100049

在天文大视场高分辨率成像领域,对地表层自适应光学(Ground-Layer Adaptive Optics,GLAO)系统作出准确的理论评估是系统设计与优化的关键前提。在GLAO技术中,地表层湍流特性与导引星布局是影响系统性能的重要因素。针对不同湍流环境与... 详细信息

在天文大视场高分辨率成像领域,对地表层自适应光学(Ground-Layer Adaptive Optics,GLAO)系统作出准确的理论评估是系统设计与优化的关键前提。在GLAO技术中,地表层湍流特性与导引星布局是影响系统性能的重要因素。针对不同湍流环境与导引星位置分布,基于空间频谱滤波理论和蒙特卡洛方法对GLAO系统进行理论分析与性能评价工作,从而验证两种方法的正确性与准确性。结果表明,两种模型得到的系统校正规律呈现明显的一致性。在一定条件下,两种方法数值模拟偏差最大不超过4.6%。空间频谱滤波原理将系统简化为线性模型,其计算速度更快,便于发现系统特征规律,但是该方法适用于导引星呈对称布局的系统性能分析,不适用于非对称排布的任意导星布局解析分析。蒙特卡洛方法结合真实系统的物理过程进行实时模拟,其导引星布局可以任意设置,对于系统实际运行状态的预测更加准确。在两种分析方法对比的基础上,进一步针对系统布局给出了初步的优化结果,相关工作对未来GLAO系统的设计与优化具有指导意义。

关键词：地表层自适应光学空间频谱滤波理论蒙特卡洛导引星

基于点衍射干涉仪的分布式随机并行梯度下降算法

在线全文

学校读者我要写书评

暂无评论

红外与激光工程 2011年第12期40卷 2451-2457页

作者：付强沈锋饶长辉中国科学院光电技术研究所自适应光学研究室四川成都610209 中国科学院自适应光学重点实验室四川成都610209 中国科学院研究生院北京100049

分析了一种光强解耦合的分布式随机并行梯度下降算法,此算法借助近场的波前传感器得到性能指标来得到算法的更新参数,这种性能指标解耦了随机并行梯度下降算法使用的耦合的全场光强,使得算法性能得到提升。分析了一种马赫泽得形式的自... 详细信息

分析了一种光强解耦合的分布式随机并行梯度下降算法,此算法借助近场的波前传感器得到性能指标来得到算法的更新参数,这种性能指标解耦了随机并行梯度下降算法使用的耦合的全场光强,使得算法性能得到提升。分析了一种马赫泽得形式的自参考点衍射干涉仪作为波前传感器。建立两种仿真模型对算法进行了分析,结果表明分布式的随机并行梯度下降算法比原算法在收敛速度上有了数量级的提升,在127仿真结果单元模型上,收敛速度是原算法的10倍以上且收敛结果几乎相同。仿真研究针对不同光束之间的平移相差和同光束的高阶像差,显示了算法应用在光束相干合成的前景。

关键词：分布式随机并行梯度下降点衍射干涉仪自适应光学

EAST-Educational Adaptive-optics Solar Telescope

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第6期22卷 33-41页

作者： changhui rao Xuejun rao Zhimao Du Hua Bao Cheng Li Jinlong Huang Youming Guo Libo Zhong Qing Lin Xin Ge Jinsheng Yang Xinlong Fan Yangyi Liu Dan Jia Xin Li Mei Li Ming Zhang Yuntao Cheng Jiahui Zhou Jiawen Yao Lanqiang Zhang Naiting Gu The Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China The Key Laboratory on Adaptive Optics Chinese Academy of SciencesChengdu 610209China The University of Chinese Academy of Sciences Beijing 100049China Shanghai Astronomy Museum Shanghai 201306China Sichuan Police College Luzhu 646000China

For the public having a better understanding of solar activities,the Educational Adaptive-optics Solar Telescope(EAST)was built in July 2021 and is located at the Shanghai Astronomy *** EAST consists of a 65 cm aperture solar telescope with a 177-element adaptive optics system and two-channel high resolution imaging system at the Hαand TiO bands,in addition to three full disk solar telescopes at CaK,Hαand TiO bands equipped on the tube of the main *** this paper,the configuration of the EAST is *** performance and on-sky observational results are *** EAST,to our knowledge,is the most advanced solar telescope for the popularization of science in the *** to its excellent performance,the data acquired by the EAST can also be used for research on solar physics and space weather prediction.

关键词： instrumentation adaptive optics-instrumentation high angular resolution-techniques high angular resolution-Sun general

Adaptive optics based on machine learning: a review

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2022年第7期5卷 38-57页

作者： Youming Guo Libo Zhong Lei Min Jiaying Wang Yu Wu Kele Chen Kai Wei changhui rao The Key Laboratory on Adaptive Optics Chinese Academy of SciencesChengdu 610209China The Laboratory on Adaptive Optics Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China University of Chinese Academy of Sciences Beijing 100049China

Adaptive optics techniques have been developed over the past half century and routinely used in large ground-based telescopes for more than 30 *** this technique has already been used in various applications,the basic setup and methods have not changed over the past 40 *** recent years,with the rapid development of artificial in-telligence,adaptive optics will be boosted *** this paper,the recent advances on almost all aspects of adapt-ive optics based on machine learning are *** state-of-the-art performance of intelligent adaptive optics are *** potential advantages and deficiencies of intelligent adaptive optics are also discussed.

关键词： adaptive optics machine learning deep learning