摄像机标定中的角点提取方法及改进

简述了摄像机标定的原理,分别采用Harris角点提取法和改进的Harris角点提取法提取角点的两组图像坐标,采用Tsai标定法标定,并使用标定结果重构世界坐标,比较了两者的误差．     

Optimization of gray-scale performance in pixellated-metal-mirror FLC-OASLM by equivalent circuit model

An equivalent circuit model of a pixellated-metal-mirror ferroelectric liquid crystal (FLC) optically addressed spatial light modulator (OASLM) is proposed. Using both structure and FLC material parameters of a real device and real material as the simulation parameters, the model is firstly confirmed by good agreement of simulation results and the reported experimental ones, and then utilized to optimize gray-scale performance of the OASLM. The model is developed from an improved FLC equivalent circuit, and has the ability to describe the voltage dropped across the modulating layer and to predict how optical outputs vary over time with the input drive voltage and control image. Simulation results indicate that gray-scale performance of the OASLM is highly dependent on write pulse width. More than 10 gray scales are observed when write pulse width is 100 μs and the number reduces to four when it reaches 500 μs. Other parameters of drive voltage can be set to adjust the region of write light intensity over which gray scales are best produced, and write pulses are found to be primary at high write light intensities, whereas erase pulses are dominant at low write light intensities. Furthermore, although gray-scale performance is weakly dependent on erase-light intensity, the erase light is necessary to ensure a proper erasure of the device and at least 1 mW/cm² is required in this study.     

时域展宽特性对相关检测性能的影响分析

时域展宽是激光回波脉冲的重要特性,也是影响激光雷达相关检测性能的重要因素。建立了考虑时域展宽特性的激光回波脉冲数学模型,以此模型和相关检测原理为基础分析了时域展宽特性对相关检测测距误差、信噪比的影响,从激光发射脉冲的近高斯能量时间分布模型出发,推导了时域展宽系数的计算公式,并对理论分析和计算结果进行了仿真论证。仿真结果表明:回波脉冲时域展宽系数与其衰减系数成反比,与发射脉冲上升时间成正比,随着时域展宽系数的增大,激光雷达相关检测系统测距误差增大,信噪比降低。     

新型螺旋型内包层双包层光纤吸收效率分析

提出一种新型的内包层横截面边界为螺旋曲线的双包层光纤结构,并给出一种分析双包层光纤吸收效率的新方法:它以射线法为基础,采用概率理论计算出光纤内部传播的光线每次被内包层边界反射后能够被纤芯直接吸收的概率,并以此概率来衡量内包层横截面形状对光纤吸收效率的影响.最后用这种方法对螺旋型双包层光纤进行分析,得出它比一般缺陷型双包层光纤优异的结论.     

锦州市公共气象预报服务业务工作平台

为适应公众气象预报服务业务的需求,提高公众气象服务针对性、及时性、规范性和准确性,满足公众预报实时业务的需求,利用VB和Access数据库知识开发研制了锦州市公共气象预报服务业务工作平台。该平台可实现各种预报信息的调看,预报会商、公众预报、专业预报信息,决策预报的编辑、信息传输和查询,建立历史灾害性天气个例库和灾情库,并实现其查询功能;平台的建设规范了公共气象预报服务的工作流程,提高了预报员工作效率及预报水平。     

Camera接口控制器的ASIC设计与实现

介绍了Camera接口控制器的基本功能和工作原理,详细阐述了该控制器的设计架构,重点介绍了数据接收控制模块和数据输出控制模块的设计思路。在用Verilog语言实现整个设计的基础上,运用编译仿真工具进行功能仿真,利用SIMC 65 nm工艺库和综合工具对其综合。经过FPGA验证,确保该控制器作为一个独立的IP核可嵌入到ASIC系统中。     

智能家居中老人跌倒远程监护系统的设计

经过对人体跌倒中所经历状态的分析,设计了一种基于检测加速度变化来判断跌倒的远程跌倒报警仪。这种跌倒检测报警仪的工作原理是通过对佩戴人发生跌倒时身体姿态的变化所引起的传感器3个轴上的加速度变化来监测人体是否跌倒。当检测到人体跌倒后,跌倒检测报警仪自身发出声光报警信号,并自动将跌倒报警的信息通过GPRS以短信或拨打电话的方式通知监护人员,同时通过IEEE 802.15.4e无线的方式将报警信息发到智能家居的远程监控网页,进行远程报警提示和报警信息的存储。     

Growth of Strained Si1－xGex Layer by UV/UHV/CVD

Strained Si1－xGex and Si materials are successfully grown on Si substrate by ultraviolet light chemical vapor deposition under ultrahigh vacuum at a low substrate temperature of 450℃ and 480℃，respectively.At such low temperature,autodoping effects from the substrate and interdiffusion effects at each interface could be suppressed efficiently.The strained Si1－xGex and multilayer Si1－xGex /Si structures are examined by X-ray diffraction,SMIS,etc.,and it is found that the materials have good crystallinity and the rising and falling edges are steep.The technique has a capability of growing highquality Si1－xGex /Si strained layers.     

An Electroabsorption Modulator Monolithically Integrated with a Semiconductor Optical Amplifier and a Dual-Waveguide Spot-Size Converter

A semiconductor optical amplifier and electroabsorption modulator monolithically integrated with a spot-size converter input and output is fabricated by means of selective area growth,quantum well intermixing,and asymmetric twin waveguide technology.A 1550～1600nm lossless operation with a high DC extinction ratio of 25dB and more than 10GHz 3dB bandwidth are successfully achieved.The output beam divergence angles of the device in the horizontal and vertical directions are as small as 7.3°×18.0°,respectively,resulting in a 3.0dB coupling loss with a cleaved single-mode optical fiber.     

室温铁磁性Al2O3∶Mn的制备及性质

以Al2O3为衬底利用多能态离子注入法在离子注入设备上制备了一系列具有室温铁磁性的Al2O3:Mn样品.在Al2O3的X射线衍射峰附近发现新的衍射峰,该衍射峰既可能对应一种未知新相,也可能对应Al2O3:Mn固溶体.所有样品都具有磁滞现象和室温铁磁性.