Rb原子饱和吸收稳频半导体激光器系统

用饱和吸收光谱法对半导体激光器进行稳频，通过对反馈回路的优化设计，得到具有高信噪比的饱和吸收光谱微分误差信号，从而大大提高了半导体激光器的频率锁定灵敏度及长期稳定性，该中用于Rb原子的激光冷却与囚禁。     

Experiments and analyses of a new type optical system for computed radiography

A new high-performance laser scanning system is designed. In this system, a scanning arm consisting of a pentagonal prism and a scanning object lens is used to replace the traditional Fθ lens, and a circular imaging plate transmission mechanism is specially designed in order to meet the requirement of the scanning arm. At the same time, the stimulation fluorescence can be obtained by the scanning arm. Some main factors that influence the spatial resolution and the performance of the laser scanner system are analyzed, and the analysis results are presented, which is helpful for further optimization design of the system. Experimental results indicate that the images obtained by the system have good visual effects and can meet the requirements of industrial inspection.     

Pupil design based on Fisher information optimization to extend field depth in practical optical system

<正>Wavefront coding(WFC) is used to extend the field depth of an incoherent optical system by employing a phase mask on the pupil.We uses a Fisher information(FI) metric based optimization method to design a phase mask by taking the modulation transfer function(MTF) of the practical optical system into consideration. This method can modulate the wavefront so that the point spread function and optical transfer function are insensitive to the object distance.The simulation results show that the optimized phase mask based on the proposed method can further improve the defocusing image quality while maintaining the focusing image quality.     

基于Goose LDW-PSO的管壳式换热器优化设计

管壳式换热器在工业中的应用越来越广泛,对于设计者和使用者来说使其费用最小化是一个很重要的目标。本文以最小化管壳式换热器的总费用为优化目标,提出了运用基于雁群启示的惯性权重线性下降粒子群优化算法(Goose LDW-PSO)对其进行优化设计。为了验证这种方法的有效性,用Goose LDW-PSO对管壳式换热器进行了优化设计,并与原始设计结果进行了比较。比较结果表明,虽然管子数目增加,但是换热器的总费用比传统方法少了很多。     

TEM喇叭天线脉冲辐射特性

采用时域有限积分法（FIT）对相同几何口径尺寸下不同长度TEM喇叭天线的主轴辐射特性进行了研究,分析了有限长TEM喇叭天线与理想（无限长）TEM喇叭天线主轴辐射场存在差异的原因,导出了有限长TEM喇叭天线主轴辐射场在接近理想TEM喇叭天线辐射场条件下天线长度与激励脉冲宽度（或脉冲上升时间）之间的关系。在此基础上,根据文献中的研究结果,并结合激励脉冲波形,给出了TEM喇叭天线几何参数的优化设计方法。     

转轮优化设计二元能量收支控制新理念

大流量贯流式水轮机转轮叶片由轮毂至轮缘形状变化很大,流动特征变化亦非常明显,采用代表半径处能量平均的一元设计将不能满足要求。为了使转轮叶片设计达到更细致的优化设计目标,非常有必要进行二元的转轮叶片翼型优化设计。本文提出将一元能量概念及技术扩张至二元能量收支的新概念。研究中由CFD三维数值解析结果求得叶片进出口二元能量收支状况并对其进行评价及控制,为转轮叶片翼型优化设计提供依据。研究结果表明,二元能量收支方法对优化设计具有实际意义,用此方法设计的贯流式水轮机效率比一元设计提高了0.5%。     

热膨胀系数异性轴夹角优化分析

高超声速飞行器需要先进的材料进行热防护,比如增强碳/碳材料.有两种将碳纤维制作成碳/碳球锥外形的工艺,研究表明在每种工艺中,碳/碳块体或碳纤维热膨胀系数异性轴角度对结构热应力影响很大,为此本文发展了一套优化设计方法,对给定的对流加热温度场可以实现球锥热应力的最小化.分析结果表明对于热膨胀系数异性轴角度,存在某些取值点,那时结构热应力分别达到最大和最小值.在异性轴模晕小于同性平面模量的条件下,对于工艺1,如果将球锥对称轴设置成垂直于碳/碳块体的同性平面,可以将热应力减至最小;对于工艺2,如果能将编制面内的碳纤维束异性轴角度取成负值(即指向来流方向),则球锥热应力也可以得到相当程度的减小.     

Optimized Second Harmonic Generation of Femtosecond Pulse by Phase-Blanking Effect in Aperiodically Optical Superlattice

In order to minimize the effect of the unconsidered frequency components on the generated compression pulse, the phasing-blanking effect is taken into account of designing the one~dimensionai aperiodic domain reversal structure. Hierarchic genetic algorithm for the design of a domain reversal grating to modulate the spectrum and phase of the generated SH pulse simultaneously are presented. Our simulation shows that the quality of an output pulse is fairly improved.     

连续变焦光学系统设计讲座机械补偿式三组元连续变焦光学系统设计方法(1)

介绍了机械补偿式三组元连续变焦光学系统的基本工作原理以及光学设计方法的全过程.其中包括变焦和补偿方案的选择、高斯光学各组元焦距分配、外形尺寸计算、初级像差平衡、PW求解、初始结构参数确定、系统实际像差自动平衡,直到凸轮曲线优化设计等.以图形和公式说理,以具体OCAD通用自动设计软件为工具,全面介绍三组元连续变焦系统的设计方法及过程.     

机械补偿式三组元连续变焦光学系统设计方法(3)

介绍了机械补偿式三组元连续变焦光学系统的基本工作原理以及光学设计方法的全过程.其中包括变焦和补偿方案的选择、高斯光学各组元焦距分配,外形尺寸计算、初级像差平衡、PW求解、初始结构参数确定、系统实际像差自动平衡,直到凸轮曲线优化设计等.以图形和公式说理,以具体0CAD通用自动设计软件为工具,全面介绍三组元连续变焦系统的设计方法及过程.