排序方式: 共有95条查询结果,搜索用时 15 毫秒
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基于微分形式的麦克斯韦方程组,采用严格两点边值方法求解等离子体柱对入射平面波的散射问题.结合柱约束空间径向非均匀等离子体分布特征推导电磁波散射系数的数学模型,计算了不同入射波频率、等离子体频率、等离子体碰撞频率条件下散射场的分布.结果表明:电磁波的散射场由等离子体特征参数、入射波频率及极化方式共同决定;等离子体碰撞频率对平行极化波的散射场分布影响较大. 相似文献
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AOTF高光谱探测系统对伪装目标的识别研究 总被引:1,自引:0,他引:1
为了获得目标和背景更精细的光谱信息,解决目前伪装目标与背景在一定波长范围内接近"同色同谱"而造成的目标识别难题,搭建了一套高光谱成像探测系统,并以典型林地背景中的伪装目标为例,对其进行探测与识别,获得目标和背景的高光谱信息以及强度对比度曲线。通过分析发现,伪装目标与背景难以实现完全的"同色同谱",在某些波长上目标的特征比较明显,强度对比度较大。表明通过筛选特定的波长能对伪装目标实现有效快速的探测与识别。这些结果对于高光谱探测系统的应用具有指导意义。 相似文献
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The propagation of the high-power microwave (HPM) with a frequency of 6 GHz in the low-pressure argon plasma was studied by the method of fluid approximation.The two-dimensional transmission model was built based on the wave equation,the electron drift-diffusion equations and the heavy species transport equations,which were solved by means of COMSOL Multiphysics software.The simulation results showed that the propagation characteristic of the HPM was closely related to the average electron density of the plasma.The attenuation of the transmitted wave increased nonlinearly with the electron density.Specifically,the growth of the attenuation slowed down as the electron density increased uniformly.In addition,the concrete transmission process of the HPM wave in the low-pressure argon plasma was given. 相似文献
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一种双层吸波材料的制备与吸波特性研究 总被引:3,自引:1,他引:2
依据阻抗匹配原理与电磁波传播规律,设计了具有阻抗渐变结构的双层吸波材料。实验表明,匹配层对提高吸收率起着重要作用;需精确控制其吸波剂含量,以实现吸波效果。 相似文献