基于Vega的红外图像仿真

介绍了红外成像仿真的基本理论,讨论了利用Vega传感器模块将输入的可见目标图像生成红外图像的技术。该技术使用Creator软件进行三维几何建模和纹理映射,使用TMM软件进行红外材质建模;然后,用Mat软件进行大气衰减的计算;最后,用SensorWorks软件进行传感器特性建模,通过光电转换生成红外图像。以阿帕奇AH6直升机为例进行了红外图像仿真,结果表明,利用Vega传感器模块进行传感器建模,建模效果较好,成本低,易于工程实现。     

300～1100nm多波段成像光学系统设计及杂光分析

设计了一套300～1100nm多波段光学系统,该系统能对目标的近紫外、可见光和近红外3个波段同时成像,可满足目标多波段信息探测的要求。由于在光学系统中镜筒内壁反射和棱镜表面反射会产生杂光和鬼像,因此,利用Light—Tools软件对此系统的杂光和鬼像进行了模拟分析。模拟结果表明,视场之外11．7—18．3°和-11．7～-18．3°的入射光线被胶合棱镜上下表面反射后,会聚焦到3个探测器靶面范围内,形成鬼像;6．2°-9．8°和一6．2°--9．8°的入射光线被镜筒反射后会在3个探测器上形成杂光。利用设计的多波段光学系统进行了相关实验,结果证明了模拟分析的正确性,表明此分析能用于指导多波段光学系统的设计和研制。提出了减少杂光和鬼像的相应措施,实验结果验证了提出的措施能够减少杂光及消除鬼像,提高系统成像质量。     

Perturbation characteristics of ambient sea noise caused by submerged objects

The perturbation characteristics of ambient sea noise field caused by scattering of submerged objects are discussed theoretically. Based on the sea noise source model with Gaussian-correlation amplitude, and applying the integral expressions for arbitrary source distribution and the spherical wave expression of Green function for a monopole in half-infinite space, the expressions of direct-arrival noise fields, scattering fields and total noise fields of a rigid spherical object under the irradiation of monopole and dipole sources, as well as the covariance among those noise fields at two receiving points are obtained. The numerical results of scattering directional patterns of rigid spherical objects and the visibility are given. It is shown that the total noise field is affected by not only the impedance characteristics of the object, the direction of receiver, but also the correlation between surface sources, and the interference between direct-arrival and scattering fields greatly. The results show that the sound visibility of a rigid spherical object is about 4-5 dB in near range and the scattering directivity characteristics of a rigid spherical object under the irradiation of surface sources are different from those of plane wave incidence.     

Phase Dependence of Fluorescence Spectrum of a Two-Level Atom in a Trichromatic Field

We examine the phase-dependent effects in resonance fluorescence of a two-level atom driven by a trichromatic modulated field. It is shown that the fluorescence spectrum depends crucially on the sum of relative phases of the sideband components compared to the central component, not simply on the respective phases. The appearance or disappearance of the central peak and the selective elimination of the sideband peaks are achieved simply by varying the sum phase. Once the sum phase is fixed, the spectrum keeps its features unchanged regardless of the respective relative phases.     

一种新型桥路型HTSFCL的实验研究

在研究一种新型桥路型高温超导限流器的限流原理的基础上，研制开发了一台三相600V、故障电流峰值100A的实验室样机．本文介绍了该限流器的功率电路、控制器、低温容器和高温超导磁体等部分的结构特点和功能．在三相系统中进行了各种短路故障限流实验，结果表明该限流器有较强的限流能力和重合闸能力，说明新型高温超导限流器的研究对改善电网动态性能和提高电网电能质量有十分重要的意义．     

RIBLL终端LASCAR闪烁体阵列探测器研制进展

介绍了RIBLL终端LASCAR闪烁体阵列探测器的工作原理和结构特点. 描述了为满足放射性核束实验的要求而对阵列所作的重要改进. 给出了LASCAR构型优化改造的工作设想和实施步骤. The principles and structure characteristics of LASCAR scintillator array detector at RIBLL terminal are described. Special emphases are laid upon the latest progress for the development of LASCAR array detector to meet the requirements of the RIB experiments. The working plan and steps for optimizing configuration of the LASCAR multi unit neutron scintillator array detector are also presented.     

不同窑口古代青瓷的产地特征的中子活化分析

产地属性是科学鉴别遗址和墓葬中出土的古陶瓷烧制产地的重要依据.用仪器中子活化（INAA）有损分析了浙江寺龙口越窑、江西洪州窑和陕西耀州窑出土的古瓷碎片样品,通过实验数据的统计分析,结果表明3个窑口古瓷的元素组成具有各自的特征,它们之间具有可以区分的依据,寺龙口越窑与南方江西洪州窑的制胎原料关系较近,与北方陕西耀州窑的关系较远.这些试验结果将为古陶瓷地研究提供重要参数.Provenance characteristic is an important scientific parameter to identify ancient porcelain wares unearthed from sites and graves.The porcelain samples of Si Long Kou kiln of Zhejiang Province,Hong Zhou kiln of Jiangxi Province and Yao Zhou kiln of Shanxi Province have been analyzed with neutron activation analysis(NAA) in this paper.The experimental data were studied with statistic methods.The results show that the chemical compositions of porcelain body samples for three kilns were different. The difference was been able identified. The body materials of both Si Long Kou Yue kiln and Hong Zhou kiln of Jiangxi were similar. The samples of Yao Zhou kiln in north of China existed obvious difference.     

热声系统中回热器特征阻抗与传播常数的研究

针对本实验室一台声驱动热声系统,采用传递函数法研究声驱动系统中回热器的特征阻抗和传播常数.通过调节谐振管长度,改变回热器表面的阻抗,从理论上分析了回热器网络传输方程中的声传播常数、特征阻抗与系统网络元件中的阻抗、导纳和流的关系.并且进一步讨论有无换热器以及不同的加热功率对回热器网络参数的影响.结论有利于进一步量化回热器的网络参数.     

第二配体对Sm(DBM)3掺杂的PMMA样品发光的影响

分别使用phen（1,10-邻菲咯啉）、TOPO（三正辛基氧化磷）、TPPO（三苯基氧化磷）作为第二配体与Sm（DBM）3（DBM：二苯甲酰甲烷）相互作用,合成了相应的配合物,然后分别将其掺入MMA中,进行聚合得到了固体样品。测量了不同第二配体样品及无第二配体样品的激发和发射光谱,对谱峰做了指认。发射谱中主要发射峰均为Sm^3＋的特征发射,有机配体的发光带很弱,说明从有机配体到稀土发光中心的能量传递非常有效。监测Sm^3＋离子644nm发射峰（^4G5/2→^6H9/2）测量了样品的激发光谱。结果显示,第二配体的加入改变了有机配体的能级结构,激发边出现明显的移动,同时紫外区的激发效率发生了变化,对发光产生了显著的影响。还测量了上述样品中Sm^3＋的^4G5/2能级的发光衰减曲线,拟合出该能级的跃迁寿命,针对不同第二配体的情况进行了比较分析。实验结果表明,第二配体的共轭性和化学键匹配对发光强度影响很大,在我们的结果中,第二配体为TPPO时发光效率最高。     

操作参数对PEM燃料电池中水迁移的影响

质子膜内水分和阴极多孔电极中液态水含量是PEM燃料电池正常运行的控制因素。本文给出了一个用于研究PEM燃料电池内水迁移的稳态、等温、两相流模型。模型耦合了连续方程、动量守恒方程和物质守恒方程,以及水在质子膜中传递方程。运用试验结果验证了模型的有效性。分析模拟结果表明,增大系统操作压力、升高电池操作温度和降低加湿温度将会使质子膜中水的净迁移通量增大;增大操作压力、降低操作温度和升高加湿温度会增加阴极CTL与GDL界面上液态水含量。