【摘 要】
：
The active control of 30-m ring interferometric telescope (RIT) needs edge sensing and tip sensing when its primary mirror is composed by trapezoid-shaped segments, and the imaging performance of the RIT is determined by the accuracy of these two detectin
【机 构】
：
YunnanAstronomicalObservatory,ChineseAcademyofSciences,Kunming650011,China
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
The active control of 30-m ring interferometric telescope (RIT) needs edge sensing and tip sensing when its primary mirror is composed by trapezoid-shaped segments, and the imaging performance of the RIT is determined by the accuracy of these two detecting approaches. Considering the detecting accuracy available in current segmented telescope active control systems, the effect of these detecting approaches on the surface error of the RIT primary mirror is calculated from the point of error propagation. The corresponding effect on imaging performance (modulation transfer functions (MTFs) and point spread functions (PSFs) at several typical wavelengths) of the RIT primary mirror is also simulated. The results show that tip sensing is very important for increasing the active control quality of the RIT primary mirror under the present techniques.
其他文献
文中报道利用双光子共振激发锂原子到4s态,获得了多条受激电子辐射和相干辐射,同时观察到了高于4s能级的nd,ns态(n≥4)到2p态的跃迁,以及从连续态到3s态的辐射。
Comparative optical study of biofluids (serum, urine, hemodialysate) by concentration change of endogenous visible fluorescence substance (VFS) has been carried out. Biofluids were collected from chronic kidney diseases (CKD) patients (Pts) as well as fro
The rapid rise in the power conversion efficiency (PCE) of CsPbBr2I-based perovskite solar cells (PSCs), from 4.7% in 2016 to 11.08% in 2020, render it a promising material for use in photovoltaic devices. However, the phase stability and curre
从理论上分析了线阵InGaAs光电探测器阵列在采用光谱成像技术的光纤光栅传感解调系统中的的成像原理,在此基础上,对日本滨淞光子公司生产的G9212 型号的线阵InGaAs结构、工作方式等光电信号处理过程进行讨论。针对该型号的光电探测器阵列设计了使其正常工作的驱动时序电路,并用Verilog HDL 语言进行模块描述和CPLD实现驱动时序电路的仿真。实验结果表明,设计符合光纤光栅传感解调系统中线阵InGaAs实际工作需要。
利用Kolmogorov谱、修正Hill谱和Rytov改进模型三种大气湍流功率谱模型,得到了光强闪烁激光雷达探测路径上闪烁指数与大气折射率结构常数之间的关系。分析了不同内尺度下大气湍流强度的变化情况,并与不考虑内尺度的情况进行了比较。结合实验数据对比分析了内尺度对光强闪烁激光雷达在探测大气湍流时的影响程度,结果表明在内尺度的取值变化范围内,采用修正Hill谱时,理论上有限内尺度的折射率结构常数与不考虑内尺度时折射率结构常数的比值可达9,实验中传输距离为1020 m和2040 m的传输路径上两者最大偏差为0
据美国海军即将在新奥尔良光纤通讯专题会议上阐述的一项研究说，长期低剂量的原子辐射能够使某些长波长光纤的吸收大大增强。
本文提出一个激光振荡的模型,并根据Dekker的耗散系统的量子化程序分别用密度算子方法和Langevin方法导出激光运动方程式。与Lamb的库理论结果进行了比较,可以看到Lamb的结果是本文结果的零级近似。
针对现有棋盘格角点检测算法存在精度不足的问题,提出一种基于Hough变换和圆形模板的高精度棋盘格角点检测算法:首先,利用Hough变换和棋盘格直线分布特征获取有效直线,构建棋盘格角点,实现角点的粗略定位;其次,构建圆形模板,使其在粗略定位的角点周围移动,搜索相关点并获取其图像坐标及其观测距离;最后,最小化多个相关点坐标的实际距离与其观测距离的差值并求解,实现角点的精确定位。实验结果表明,本文提出的
Designs of p-doped in quantum well (QW) barriers and specific number of vertically stacked QWs are proposed to improve the optical performance of GaN-based dual-wavelength light-emitting diodes (LEDs). Emission spectra, carrier concentration, electron cur