A type of scalable self-imaging capable of variable magnification or minification of periodic objects is demonstrated in the focal plane of a lens illuminated by a point source.The theory and the experimental results ...A type of scalable self-imaging capable of variable magnification or minification of periodic objects is demonstrated in the focal plane of a lens illuminated by a point source.The theory and the experimental results show that the self-imaging phenomenon can also be realized in the focal plane of a lens regardless of whether the distances satisfy the lens formula or not.The particular property of this scalable self-imaging effect is that the images in the focal plane can be controlled with different scaling factors only when the distances between the point source and the periodic object satisfy a certain condition.This discovery should open a new field of diffraction imaging and new application opportunities in precision measurement.展开更多
针对电磁混响室难以仿真的问题,分析了平面波叠加模拟混响室场分布的合理性,根据理想混响室特征给出了叠加平面波的幅值、极化角度等参数设置的细节信息。在此基础上,利用Matlab调用FEKO的混合编程方法进行了场环境模拟,检验结果表明,...针对电磁混响室难以仿真的问题,分析了平面波叠加模拟混响室场分布的合理性,根据理想混响室特征给出了叠加平面波的幅值、极化角度等参数设置的细节信息。在此基础上,利用Matlab调用FEKO的混合编程方法进行了场环境模拟,检验结果表明,叠加场环境特性与混响室场分布特性保持了一致。利用该方法,对某开缝矩形腔体的屏蔽效能进行了仿真测试,并取得了与实测数据相符的结果,其屏蔽效能约为15 d B。该方法有效避免了对混响室的精确建模,大大降低了混响室条件下相关测试仿真的难度与计算量,同时为深入分析混响室场环境特性提供了一条捷径。展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.61675093 and61705096)the Natural Science Foundation of Shandong Province(No.ZR2017MA035)+1 种基金the Shandong Province Higher Educational Science and Technology Program(No.J17KA176)the Taishan Scholars Project of Shandong Province(No.ts2015110055)。
文摘A type of scalable self-imaging capable of variable magnification or minification of periodic objects is demonstrated in the focal plane of a lens illuminated by a point source.The theory and the experimental results show that the self-imaging phenomenon can also be realized in the focal plane of a lens regardless of whether the distances satisfy the lens formula or not.The particular property of this scalable self-imaging effect is that the images in the focal plane can be controlled with different scaling factors only when the distances between the point source and the periodic object satisfy a certain condition.This discovery should open a new field of diffraction imaging and new application opportunities in precision measurement.
文摘针对电磁混响室难以仿真的问题,分析了平面波叠加模拟混响室场分布的合理性,根据理想混响室特征给出了叠加平面波的幅值、极化角度等参数设置的细节信息。在此基础上,利用Matlab调用FEKO的混合编程方法进行了场环境模拟,检验结果表明,叠加场环境特性与混响室场分布特性保持了一致。利用该方法,对某开缝矩形腔体的屏蔽效能进行了仿真测试,并取得了与实测数据相符的结果,其屏蔽效能约为15 d B。该方法有效避免了对混响室的精确建模,大大降低了混响室条件下相关测试仿真的难度与计算量,同时为深入分析混响室场环境特性提供了一条捷径。
