Aperture相关论文
运用Collins衍射积分推导了贝塞尔－高斯光束经圆光阑限孔透镜后的轴上光强表达式。通过数值计算讨论了轴上光强的分布规律。对贝塞......
本文分析了激光的横模结构以及在小孔耦合输出情况下的损耗特征,提出了确定激光谐振腔最佳耦合孔径的简便方法,实验证明效果良好。......
基于广义惠更斯-菲涅耳衍射积分公式, 以LohmannⅠ型光学系统为例, 推导出Bessel光束通过含光阑的球差分数傅里叶变换系统后的场分......
通过对高斯光束经光阑衍射后轴上点光强分布规律的分析,详细讨论了复费涅耳数的物理意义及其应用,指出采用位相片,可将远场轴上光......
CMOS图像传感器常采用像元在奈奎斯特频率处的调制传递函数(MTF)值对成像质量进行评价。MTF主要由孔径MTF和扩散MTF的频域乘积得到......
柱坐标下的径向偏振矢量光束在被高数值孔径透镜聚焦时，在紧聚焦条件下相比线偏振和圆偏振光束通过透镜后能获得较小的聚焦斑。在聚......
Aperture synthesis is an important approach to improve the lateral resolution of digital holography(DH) techniques. The ......
Potassium dihydrogen phosphate(KDP) single crystals are the only nonlinear crystals currently used for electro-optic swi......
We demonstrate coherent beam combining of two tiled-aperture single-frequency fibre amplifiers with a total output power......
Laser resistance and stress-free mirrors,windows,polarizers,and beam splitters up to 400 mm×400 mm are required for the......
Large aperture Nd:phosphate laser glass is a key optical element for an inertial confinement fusion(ICF) facility. N31,o......
We propose a large parallax barrier by use of aperture grille.Main advantages of using aperture grille include no reflec......
The work presented in this paper is a study of output temporal contrast degradation by near-field quality deterioration,......
The physical meaning and essence of Fresnel numbers are discussed,and two definitions of these numbers for offaxis optic......
The Shenguang-II Upgrade(SG-II Up) facility is an under-construction high-power laser driver with eight beams, 24 kJ ene......
光流体可变光圈在图像采集、目标追踪、生物识别和其他便携式电子设备中具有重要的应用潜力。与机械光圈相比,该光圈孔径是近乎完......
A Schwarzschild microscope with a numerical aperture of 0.2 and a magnification of 130 in a 100μm field of view(FOV)is ......
According to the thickness and the configuration of sound-absorbing material,the cavity’s acoustical impedance and the ......
For absorption measurement of large-aperture optical coatings,a novel method of imaging photothermal microscopy based on......
An effective damage test method based on a marker-based watershed algorithm with gray control(MWGC) is proposed to study......
An ECR ion source which aimed to meet the needs of ADS (accelerator driven sub-critical system) has been developed.Its p......
Recently,some kinds of structures have been found to show the property of extraordinary optical transmission(EOT).In thi......
Synthetic Aperture Radar (SAR) imaging of ocean surface features is studied. The simulation of the turbulent and vortic......
Ground penetrating radar (GPR) is an impactful detection method of buried targets developed in these decades and has bee......
In this paper,a focusing approach is presented to widen the use of efficient monostatic imaging algorithms for azimuth-i......
With two-dimensional synthetic apertures,a wideband radar array can realize 3D imaging of air targets,but this needs lar......
Multi-input multi-output (MIMO) radar which has evident advantages in many applications is a new radar system.Applying t......
Compressive sensing(CS) techniques offer a framework for the detection and allocation of sparse signal with a reduced nu......
This paper provides principles and applications of the sparse microwave imaging theory and technology.Synthetic aperture......
The characterization of x-shaped antenna arrays operating in the mid-infrared is proposed. An equivalent circuit model f......
A quick and exact imaging method for one-dimensional layered rough surfaces is proposed in this paper to study the scatt......
Based on aperture averaging effects on scintillation, a diversity reception system consisting of three apertures has bee......
In this study, the combined effects of geometrical distribution and geomechanical deformation of fracture networks on fl......
为提高滤波后极化合成孔径雷达(polarimetric synthetic aperture radar, Pol SAR)图像的边缘清晰度和保持目标的极化特性，提出......
孔径综合是提高成像分辨率的有效手段。针对综合孔径数字全息术,提出一种亚像素位移精度的孔径综合方法。利用基于快速傅里叶变换......
设计一种简单的光学元件——抛物缝孔径获得Pearcey光束,基于空间域中的广义惠更斯-菲涅耳衍射积分,导出该系统的Pearcey光束表达......
恒阻抗TEM喇叭天线具有沿轴线方向特性阻抗为一恒定值的特点,所以喇叭内的反射损耗非常小,常用于超宽带电磁脉冲的辐射与接收。为......
针对电脑机箱开孔产生的电磁辐射骚扰之一,建立了矩形机箱模式函数,并通过求解相应的TM场和TE场方程得到各种模式的电场分布。理论......
Propagation and aperture of staged hydraulic fractures in unconventional resources in toughness-domi
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......
Demigration refers to directly applying a specific imaging technique to a migrated section. It is applied primarily to s......
应力强度因子K1是衡量含裂纹的板件以及构件脆断行为的重要参数之一。本文以一带有带状裂纹的开孔矩形薄板为研究对象，利用ANSYSY中......
Effect of Structural Parameters on the Performance of NS High-efficiency Composite Trays I.The Effec
In this paper,the structure and characteristics of the NS high-efficiency composite trays based on the doublelayer apert......
背景:多孔钛合金的微孔结构不但能为成骨细胞的增殖与迁移提供充分的空间,而且能增强间充质干细胞的成血管作用,影响成骨基因的表......
A novel synthetic aperture radar(SAR)image de-noising method based on the local pixel grouping(LPG)principal component a......
本文介绍了常用的血液分析仪中的血小板检测技术及血小板计数PLT和血小板平均体积M PV两参数的临床应用.......
讨论了在什么情况下数码相机与传统135相机成像效果相同，推出了二者景深相同的条件，给出了在远摄和近摄时二者的景深变换关系．......
金属纤维多孔材料是一类重要的吸声材料，采用驻波管法检测钛纤维多孔材料的空气声吸收系数，研究材料的孔隙度、纤维直径以及材料厚度......
通过对目前常用的一种快速拆卸结构形式在一种发射装置上的应用分析,找出了问题发生的原因,并针对原因进行了成功的结构改进设计,......
首先介绍了实验用盐水装置及其原理，比较不同高度和开孔大小的圆柱型通风口对置换通风效果的影响，并对不同的风口进行筛选。找出形成......
