Restoration of phase aberrations is crucial for addressing atmospheric turbulence in light propagation.Traditional restoration algorithms based on Zernike polynomials(ZPs)often encounter challenges related to high com...Restoration of phase aberrations is crucial for addressing atmospheric turbulence in light propagation.Traditional restoration algorithms based on Zernike polynomials(ZPs)often encounter challenges related to high computational complexity and insufficient capture of high-frequency phase aberration components,so we proposed a Principal-Component-Analysis-based method for representing phase aberrations.This paper discusses the factors influencing the accuracy of restoration,mainly including the sample space size and the sampling interval of D/r_(0),on the basis of characterizing phase aberrations by Principal Components(PCs).The experimental results show that a larger D/r_(0)sampling interval can ensure the generalization ability and robustness of the principal components in the case of a limited amount of original data,which can help to achieve high-precision deployment of the model in practical applications quickly.In the environment with relatively strong turbulence in the test set of D/r_(0)=24,the use of 34 terms of PCs can improve the corrected Strehl ratio(SR)from 0.007 to 0.1585,while the Strehl ratio of the light spot after restoration using 34 terms of ZPs is only 0.0215,demonstrating almost no correction effect.The results indicate that PCs can serve as a better alternative in representing and restoring the characteristics of atmospheric turbulence induced phase aberrations.These findings pave the way to use PCs of phase aberrations with fewer terms than traditional ZPs to achieve data dimensionality reduction,and offer a reference to accelerate and stabilize the model and deep learning based adaptive optics correction.展开更多
按金黄色葡萄球菌多重耐药转运蛋白NorA的编码序列设计引物,以金黄色葡萄球菌基因组DNA为模板,扩增出norA基因中1 155 bp cDNA片段,将所得片段与pMD18-T载体连接,转化到感受态大肠杆菌JM109中,成功地筛选到阳性克隆,其质粒测序结果与文...按金黄色葡萄球菌多重耐药转运蛋白NorA的编码序列设计引物,以金黄色葡萄球菌基因组DNA为模板,扩增出norA基因中1 155 bp cDNA片段,将所得片段与pMD18-T载体连接,转化到感受态大肠杆菌JM109中,成功地筛选到阳性克隆,其质粒测序结果与文献报道一致。从阳性克隆中提取质粒,经NdeⅠ和XhoⅠ酶切,回收1 155 bp目的片段,定向克隆到pET-28a(+)表达载体中,转化感受态大肠杆菌DH5α,提取质粒,再次转化到BL21(DE3)中,成功地筛选到阳性克隆。经IPTG诱导阳性菌,通过SDS-PAGE检测出norA基因的表达。展开更多
光学成像技术被广泛应用于军事、航天等领域,随着加工技术的发展,宽视场高分辨率成像成为主要应用需求。以反远摄结构作为基础,基于赛德尔像差理论,通过光阑光线入射角度控制约束,建立了一种宽视场高分辨率光学系统的初始结构。同时,以...光学成像技术被广泛应用于军事、航天等领域,随着加工技术的发展,宽视场高分辨率成像成为主要应用需求。以反远摄结构作为基础,基于赛德尔像差理论,通过光阑光线入射角度控制约束,建立了一种宽视场高分辨率光学系统的初始结构。同时,以高阶像差约束控制作为进一步优化方向,设计了一种单孔径宽视场高分辨率成像光学系统。设计的系统视场角为70°,各视场调制传递函数(Modulation Transfer Function,MTF)曲线接近衍射极限,中心视场衍射MTF在550 lp/mm处优于0.2,系统成像质量良好,各项指标满足设计要求,实现了宽视场、高分辨率设计。展开更多
文摘Restoration of phase aberrations is crucial for addressing atmospheric turbulence in light propagation.Traditional restoration algorithms based on Zernike polynomials(ZPs)often encounter challenges related to high computational complexity and insufficient capture of high-frequency phase aberration components,so we proposed a Principal-Component-Analysis-based method for representing phase aberrations.This paper discusses the factors influencing the accuracy of restoration,mainly including the sample space size and the sampling interval of D/r_(0),on the basis of characterizing phase aberrations by Principal Components(PCs).The experimental results show that a larger D/r_(0)sampling interval can ensure the generalization ability and robustness of the principal components in the case of a limited amount of original data,which can help to achieve high-precision deployment of the model in practical applications quickly.In the environment with relatively strong turbulence in the test set of D/r_(0)=24,the use of 34 terms of PCs can improve the corrected Strehl ratio(SR)from 0.007 to 0.1585,while the Strehl ratio of the light spot after restoration using 34 terms of ZPs is only 0.0215,demonstrating almost no correction effect.The results indicate that PCs can serve as a better alternative in representing and restoring the characteristics of atmospheric turbulence induced phase aberrations.These findings pave the way to use PCs of phase aberrations with fewer terms than traditional ZPs to achieve data dimensionality reduction,and offer a reference to accelerate and stabilize the model and deep learning based adaptive optics correction.
文摘光学成像技术被广泛应用于军事、航天等领域,随着加工技术的发展,宽视场高分辨率成像成为主要应用需求。以反远摄结构作为基础,基于赛德尔像差理论,通过光阑光线入射角度控制约束,建立了一种宽视场高分辨率光学系统的初始结构。同时,以高阶像差约束控制作为进一步优化方向,设计了一种单孔径宽视场高分辨率成像光学系统。设计的系统视场角为70°,各视场调制传递函数(Modulation Transfer Function,MTF)曲线接近衍射极限,中心视场衍射MTF在550 lp/mm处优于0.2,系统成像质量良好,各项指标满足设计要求,实现了宽视场、高分辨率设计。
