多模光纤束斑纹场及其应用

本文研究了Ｈｅ－Ｎｅ激光照明多模光纤束产生的斑纹场特性，讨论了不同芯径光纤组成的多模光纤束产生的斑纹场之间的差别，并与毛玻璃斑纹场进行了比较，表明多模光纤束辐射的斑纹场可用于光学测量和信息处理。     

对光纤斑纹场的研究及用于传感的探索

本文研究了光纤所产生的斑纹场的光强分布，并成功地利用此斑纹场的强度作传感参数，测量了微位移。     

多模光纤斑纹场及其应用

本文重点研究了多模光纤束斑纹场的特性和应用,将它与单根多模光纤及散射屏产生的斑纹进行比较,通过实验证明由He-Ne激光激励的多模光纤束辐射场是准均匀、稳定的单色斑纹场,如能恰当地选用光纤束,     

刚体沿其表面法线方向的平移所引起的激光斑纹运动的观察

一束激光照亮物体的漫射表面,在物面前的空间形成散射斑纹场.物体沿其表面法线方向的刚性平移(也叫离面平移或纵向平移),将引起空间斑纹场的变化.对这种斑纹运动,曾利用不同方式作过观察.     

半导体激光多模光纤束斑纹场的特性

本文研究 650rm波长的半导体激光照明多模光纤束产生的斑纹场的特性 ,讨论了决定这种斑纹场特性的各种因素。用自己设计的Y型多模光纤束 ,拍得了质量较好的半导体激光光纤束斑纹全息图。用两次曝光法再现了清晰的杨氏干涉条纹。     

多模光纤束激光斑纹场的一些特性

实验研究了不同结构的多模光纤束斑纹场的单缝、双缝、三缝衍射花样及锲形空气薄膜干涉条纹.用Y型多模光纤束拍摄了斑纹场全息光栅,研究了它的衍射花样.成功地用多模光纤束传光,测量散射物体的面内位移.     

多曝光斑纹及用于速度测量

作者研究了多曝光斑纹的某些基本性质。发现多曝光斑纹能改善干涉条纹的分辨能力,并把多曝光斑纹用于速度测量。     

专利与文献

斑纹已构成对激光测距仪的基本限制,推导出斑纹数量与所使用的光学几何结构之间关系的模型。说明同步激光扫描器具有固有斑纹降低的特性。     

用透镜阵聚焦实现均匀辐照的计算机分析

本文通过靶面光场的计算机分析,考证了用透镜列阵实现高功率激光对靶面的均匀辐照的特点,并提出一种单元列阵透镜同心度公差方向的星型排布方法,能使二维多光束干涉斑纹更密,有利于均匀性及实验的要求。     

CO2 差分吸收激光雷达探测性能研究

针对长程直接探测CO2 差分吸收激光雷达,研究了系统的探测性能。分析了影响探测性能的两类主要噪声源:斑纹噪声和探测噪声,得到了探测性能与斑纹噪声和探测噪声之间关系的计算结果。结果表明,近距离测量时,探测性能主要受斑纹噪声的限制,远距离测量时,探测性能主要受探测噪声的限制;如果系统参数选择不当,斑纹噪声将严重制约着系统的探测性能。     

About applicability of quasi-statistic method of autodyne systems analysis

There is shown applicability of quasi-static method for analysis of differential equations of single-circuit autodyne generator. We propose the methodology of quasi-static calculation of autodyne response taking into account of members of higher approximation order. The estimation of calculation inaccuracy in case of quasi-static method application is given, conditions of stability of the system of autodyne generator-reflecting object are considered, and comparative calculation of autodyne response for a cases of application of zeroth and tenth approximations.     

About principal possibility of automated following by active frequency of non-stationery processes spectrum by means of active filter

It is underlined explicit usefulness and efficiency of hardware analysis of active spectrum of non-stationery processes, necessity of automated following by frequency of input signal filters (AFFF) application as analyzing filters. It is mentioned drawbacks of analysis methods of such filters and necessity of approval possibility of frequency self-tuning of any type filters (FSAF) of high order. Possibility of FSAF and, hence, AFFF is proven in terms of application of some known features of manual regulation of electrical filters. By means of computer mathematical modeling in system VisSim/com it is proven AFFF possibility. It is underlined possibilities of some useful their application.     

Forced nonlinear precession of the magnetization vector under the conditions of an orientation transition

Forced nonlinear precession of the magnetization vector in a normally magnetized magnetic plate under the conditions of an orientation transition is considered. It is shown that, in the field lower than the form demagnetization field, the variable circularly polarized field causes precession of the equilibrium position of the magnetization vector. It is demonstrated based on a vector model in which the precession period of the equilibrium position is inversely proportional to the squared amplitude of the variable field and the sine of the angle of deviation of the equilibrium position of magnetization from the constant field. It is shown that the critical parameters necessary for excitation of precession of the equilibrium position are the amplitude and frequency of the variable field. Diagrams determining domains of existence of precession of the equilibrium position for different saturation magnetization of a magnetic plate are constructed in terms of the coordinates variable field amplitude-frequency. The role of dissipation of magnetization oscillations in the determination of the critical parameters is elucidated. The features of precession in the presence of asymmetric excitation and in the presence of anisotropy in the plane of the plate are noted.     

基于双Wollaston棱镜的偏振测量系统的精度分析

为了研究航天偏振辐射计的偏振测量精度,从偏振参量的反演过程出发,结合偏振辐射定标的方法,得出Wollaston棱镜安装角度误差和因加工工艺等造成的光束非正交的角度误差对偏振测量有一定的影响。结果表明,在角度误差一定的前提下,偏振度测量误差随入射光偏振态的变化而变化;当Wollaston棱镜角度误差都控制在0.1°内,偏振度测量精度满足航天偏振辐射计的指标要求。     

红外无线信道特性的评价方法

基于评价室内红外无线通信信道的目的,采用改进的朗伯定律描述室内表面的漫射特性,分析了信道中直射及漫射分量的大小,定义了评价红外无线信道的瞬态响应及时延的表达方法,并针对几个实用信道进行了模拟。结果表明,光接收机的ＦＯＶ及位置的变化对信道特性的影响较大。通过信道特性的分析比较,对构成高健壮性的室内光无线通信信道有积极意义。     

Topological temperature compensation in hybrid-film microthermostat on a basis of accounting of heat emission of thermostatically controlled elements of radio engineering devices

It is considered carrying out the topology temperature compensation of thermostatically controlled elements on a basis of application of effect of minimal statistic inaccuracy of temperature control with purpose of minimization of temperature inaccuracy of radio engineering devices. Numerical simulation of two-dimension non-stationery temperature fields of thermostable substrate of hybrid-integral circuits is carried out, taking into account heat emission of thermostatically controlled elements and existing heat exchange mechanisms of proportional temperature controller.     

TD-LTE系统帧配置方法的研究

针对TD-LTE无线网络规划中时隙规划的需要,对TD-LTE小区帧配置方法进行了研究.首先归纳总结了TD-LTE系统吞吐量计算方法,通过仿真,验证了TD-LTE帧配置对系统容量的影响.然后研究了TD-LTE单业务小区的帧配置方法,设计建立了基于帧结构的TD-LTE小区业务吞吐量仿真平台,并对单业务小区的用户平均吞吐量进行了仿真分析,给出了部分单业务小区的最佳帧配置建议.最后,仿真分析了多业务小区的用户平均吞吐量,给出了部分混合业务下小区的最佳帧配置建议.     

男性不孕症患者精子超微结构异常的电镜诊断

对63例男性不孕症患者的精子做了电镜超微结构观察,并做了与之对应的光镜及常规检查。除11例为死精症外,52例均为精子结构异常。52例中40例为头部异常,12例尾异常。头部异常主要为无顶体、顶体发育不良和染色质发育不良,尾异常主要为2＋9＋9结构异常及接柱异常。结果显示精子电镜超微结构检查能很好地避免误诊,并对精子结构异常的种类做出准确的诊断。     

The role of transport processes of nonequilibrium charge carriers in radiative properties of arrays of InAs/GaAs quantum dots

The results of time-resolved photoluminescence studies of heterostructures containing monolayer arrays of InAs/GaAs quantum dots are presented. A two-component time dependence of intensity of photoluminescence from the ground state of quantum dots, with characteristic times of the slow component up to hundreds of nanoseconds and those of rapid one several nanoseconds, is studied. It is shown that the slow component is determined by the transport of nonequilibrium charge carriers between the quantum dots. At low temperatures, the time of the slow component is determined by tunneling, and at high temperatures by thermal escape of nonequilibrium charge carriers. The ratio of the contributions of tunneling and thermal escape is determined by the degree of isolation of quantum dots. A theoretical model is constructed that describes the effect of the dynamics of carrier transport on the emergence and decay of the slow component of photoluminescence.     

多自由度无人船系统建模

本文通过对多自由度下无人船的运行情况分析,提出了多自由度的无人船建模方法,主要是通过分析建立无人船的六自由度的MMG分离型模型,并依次减少一个自由度,推导出了其五自由度、四自由度与三自由度下的数学运动模型,解决了无人船在各个自由度下的建模问题.在建模时依次讨论了各个自由度下无人船舵、螺旋桨、粘性流体动力的力与力矩模型,...