搜索结果: 151-165 共查到“知识库 光电信息处理”相关记录174条 . 查询时间(1.575 秒)
Nanotomography of Cell Surfaces with Evanescent Fields
Nanotomography Cell Surfaces Evanescent Fields
2009/5/19
The technique of variable-angle total internal reflection fluorescence microscopy (TIRFM) and its application to nanotomography of cell surfaces are described. Present applications include (1) 3D imag...
网格基任向偏导实现及层析应用
折射率 投影 偏导
2009/4/2
将光线偏折方程中的任向偏导转化为数值差分形式,并应用于层析线性运算.网格化待测场,将微分待测场的每一正方形网格及相应折射率近似为曲面底的正圆锥体,圆锥体顶端的折射率值对应该网格的折射率,在底面的投影对应网格的中心.假设紧邻三网格中心间的折射率分布共平面,在一个网格宽度内将偏导转化成数值差分形式.结果发现:基于上述近似和假设,可以将任意探测光线相关的偏导转化为数值差分形式,将非线性偏导方程转化为线性...
针对受光照不均影响的路面裂缝图像,提出一种基于Sobel算子和最大熵法的图像分割算
法,并采用长线段与原图进行与操作和判断黑色像素所占比例的方法去除图像孤立噪声点.根据不
同类型裂缝的几何形态,提取投影向量、分布密度和空洞数等特征值作为路面裂缝分类的依据,设
计径向基函数神经网络的分类器实现对裂缝的准确分类.实验结果表明,较传统全局阈值算法,本
文算法对光照不均图像的处理不仅能很好的提取裂...
基于NiosⅡ的图像采集和显示的实现
DMA Avalon数据流模式 SDRAM
2008/12/3
采用OV2610的CMOS图像传感器和26K色的TFT液晶屏,在SOPC上集成了OV2610、TFT液晶控制器和DMA控制器,实现了图像数据流的采集和显示。
有机共轭-纳米复合体微结构有序化及其光电理论研究
微结构 有序化 光电理论 纳米复合体
2008/10/9
该技术主要研究新型光电功能化的有序纳米复合阵列膜并将之应用于有机光伏电池、非线性光学等光电子器件上。提出了“原位吸附—受限增长”可控制备方法制备了聚合物—无机纳米阵列复合体。提出化学与机械方法配合对碳纳米管进行改性、裁剪。提出通过π-电子共轭叠积作用将苝、萘酞菁等有机共轭分子与碳纳米管形成分子级复合体,拓宽光吸收范围;将碳纳米管接枝在聚噻吩甲烯等大共轭聚合物链上,材料的三阶非线性光学系数提高了2个...
Synchronized generation of microwave DC-free sinusoids from a free- running pulsed laser for electro-optic signal processing
microwave DC-free sinusoids free- running pulsed laser electro-optic signal processing
2008/8/4
We demonstrate fiber-based generation of optically reconfigurable DC-free microwave wave-packets precisely synchronized with a free-running pulsed laser. This technique is particularly interesting for...
聚合物波导M-Z调制器TM模的泰勒级数展开法研究
电光聚合物 Mach-Zehnder波导 TM模
2008/8/4
根据聚合物脊型波导的结构特点,利用有效折射率法求出其横向折射率分布,将三维传播转化为二维传播,并从标量波动方程出发,在傍轴近似的情况下,采用Crank-Nicholson差分格式,得到了泰勒级数展开法基本计算格式,并对算法进行了适当优化;通过对Mach-Zehnder光波导TM模的模拟,分析了各种参数对损耗的影响。结果表明:泰勒级数展开法具有精度高、稳定性好、算法简单、易于编程等优点,是一种比较...
聚合物电光调制器中M-Z波导TM模分析
电光聚合物 Mach-Zenhder波导 TM模 有限差分束传播法 有效折射率法
2008/8/4
M-Z光波导是聚合物电光调制器的重要结构单元。利用有效折射率法计算聚合物脊形波导的横向折射率分布,将三维光波场传播简化为二维传播。从导模满足的标量波动方程出发,结合透明边界条件,采用Crank-Nicholson差分格式,得出有限差分束传播法的基本计算格式。通过对MZ型波导结构中TM模的传播及损耗特性进行理论分析,系统地研究了脊宽、分支角等结构参数对损耗的影响。研究表明,有效折射率法与二维有限差...
All-optical Routing Architecture of Radio Signals using Label Processing Technique for In-building Optical Networks
All-optical Routing Architecture Radio Signals Label Processing Technique In-building Optical Networks
2008/7/31
We demonstrate an all-optical scheme for routing radio signals through optical fibres employing label-processing technique. 10-MS/s 64-QAM signal carried on 5-GHz RF carrier was successfully routed wi...
Ge-on-Si Photodetectors with 33 GHz Bandwidth Implemented by RPCVD
Photodetectors Bandwidth Implemented RPCVD
2008/7/31
We report Ge-on-Si photodetectors fabricated by RPCVD showing 3-dB bandwidth of 33 GHz for the window size of 20 μ m-diameter at a wavelength of 1550 nm.
A novel DSP algorithm for improving the performance of digital coherent receiver using single-ended photo detection
DSP algorithm improving the performance digital coherent receiver single-ended photo detection
2008/7/30
A novel digital signal processing algorithm is proposed to improve the performance of digital coherent receivers using single-ended photo detection. The effectiveness of the proposed algorithm is expe...
Power efficiency of optical versus electronic access networks
Power efficiency optical versus electronic access networks
2008/7/30
Based on a model of a typical operator network we have compared the power consumption of different broadband access technologies and architectures especially DSL, FTTN + VDSL and FTTH. Even though pow...
GMPLS-controlled All-optical Mesh Networking Demonstration using Path Computation-capable NMS
GMPLS-controlled All-optical Mesh Networking Path Computation-capable NMS
2008/7/30
A GMPLS-controlled all-optical mesh networking was successfully demonstrated using a path computation-capable network management system (NMS). The developed NMS can manage topology and physical impair...
在详细分析使用微扫描技术减少混淆效应的基础上,给出一种利用微扫描技术进行空间分辨率影响分析的像素传递函数(PTF)方法,并基于2×2和4×4两种微扫描形式对该函数进行分析计算和讨论。计算结果表明,在焦平面阵列给定的情况下,微扫描技术能适当提高焦平面空间的分辨率,有效减小图像混淆,明显改善成像质量。指出在没有高空间分辨率成像器件的情况下,利用微扫描技术和低分辨率成像器件来获得较高空间分辨率的图像是完...