组合式发光二极管路灯反射器的设计

设计了一组合式路灯反射器,以使发光二极管（LED）路灯在道路照明时产生矩形光斑和均匀照度。在非成像光学基础上,利用复合抛物面的高性能集光作用和机械设计软件的强大作图功能,设计了一款分段组合复合抛物面反射器（CPC）。基于“边缘光线原理”和”裁剪法”,此款反射器能将朗伯型发光的LED光束整形为近似矩形分布,出光效率达96％以上。理论模拟证明：在高度为10m,范围为10m×30m内利用此反射器进行二次配光的LED路灯的照度均匀度达0．5以上。该反射式LED路灯光束整形器结构简单,光学效率高、成本低廉,模拟结果完全达到了目前我国国家道路照明规范要求。     

漫射光宽视场光学天线的设计

利用光线追迹的方法分析了半球光学天线及另外两种截取角小于90°的欠半球和大于90°的超半球光学天线的光学增益和接收视场,提出了选择合适截取角的原则,并确认半球形光学天线是一种很合适的漫射光宽视场光学天线;同时分析了均匀能量环境下半球光学天线圆截面上接收到光功率的分布,并提出了设计半球形光学天线基本参量的原则;用光学理论推导出了采用半球形光学天线时能够到达光敏面的光线所应满足的条件,分析了它对光学滤波设计的意义.     

工具杆几何尺寸对超声扭转振动特性的影响

依据四端网络理论，利用机电类比方法，研究了具有类圆锥过度段的复合阶梯型变幅杆的扭转共振频率和与之相连接的工具杆的几何尺寸之间的变化关系，理论和实验符合的较好，为超声扭转加工振动系统的设计提供了参考依据。     

太阳能塔式电站轮胎面定日镜的设计及性能分析

为了提高定日镜的聚光性能，研究了可校正离轴象散的轮胎面定日镜.通过计算聚光场四个典型位置的定日镜与吸热器的间距和阳光在镜面上的全年入射角变化范围，确定定日镜的焦距和视场，使用ZEMAX软件设计出轮胎面定日镜，并分析其聚光性能.与球面定日镜相比，轮胎面定日镜的聚光性能有很大提高：不仅光斑面积变小，而且可将光斑最小点从视场边缘移至视场中心附近.提出了轮胎面定日镜的制作方法，实践证明了该方法的可行性.     

Construction of asymmetric connectors of depth two

An (n,N)-connector of depth d is an acyclic digraph with n inputs and N outputs in which for any injective mapping of input vertices into output vertices there exist n vertex disjoint paths of length at most d joining each input to its corresponding output. In this paper we consider the problem of construction of sparse depth two connectors with n?N. We use posets of star products and their matching properties to construct such connectors. In particular, this gives a simple explicit construction for connectors of size O(Nlogn/loglogn). Thus our earlier idea to use other posets than the family of subsets of a finite set was successful.     

Design of a solar concentrator combining paraboloidal and hyperbolic mirrors using ray tracing method

A solar concentrator combining primary paraboloidal and secondary hyperboloidal mirrors is numerically designed by using the ray tracing method to obtain higher concentration ratio when the concentrator tracing error exists. It is found that, when the concentrator tracing errors are 0.5° or 1°, the concentration ratios are about 2027 or 1220 without the detector in the radial-direction, and the concentration ratios are about 5447 or 4701 with the detector in the radial-direction. It is shown that such method can increase the concentration solar flux by two folds when the concentrator tracing error exists. Obviously, it is an effective method to reduce the effect of concentrator tracing error even when the angle of concentrator tracing error is considered. In addition, when the angle of concentrator tracing error is small than 1°, a set of mirror shapes is suggested where the primary mirror has a f-number of 0.22 and the secondary mirror has a numerical aperture (NA) of 0.61.     

Performance of multi-junction cells due to illumination distribution across the cell surface

This paper addresses the influence of illumination distribution on the performance of a high concentration photovoltaic (HCPV) module. CPV systems comprise of optical elements as well as mechanical tracking to concentrate the solar flux onto the solar receiver as well as to keep the system on track with the sun. The performance of the subcells of the multi-junction concentrator cell depends on the optical alignment of the system. Raster scanning of the incident intensity in the optical plane of the receiver and corresponding I–V measurements were used to investigate the influence of illumination distribution on performance. The results show that the illumination distribution that differs between cells does affect the performance of the module. The performance of the subcells of the multi-junction concentrator cell also depends on the optical alignment of the system.     

扭转超声振动系统中局部共振的研究

本文从扭转振动波动方程出发，推导出了具有类圆锥过渡段的复合阶梯型扭转变幅杆的频率方程解析表达式。从实验和理论上对该复合变幅杆的谐振频率随杆细端长度和直径的变化进行了测量和计算。通过对比，证明了复合振动系统中局部扭转共振现象的存在，并得到了其产生条件。     

多用途浓缩器在气相色谱分析中的应用

本文介绍了自行研制的浓缩器结构,并以气、液、固三种类型的样品进行了实际应用。实验表明,该装置是痕量挥发性有机物浓缩富集-气相色谱分析的有效手段。