摘要
分析了微波布拉格衍射实验中发射喇叭张角在模拟晶体(100)面引起奇异峰的原因,由于喇叭发射的微波不是严格的平面波,产生布拉格衍射时存在一个临界掠射角,掠射角小于临界角时,接收喇叭不但可以接收到晶面反射波,还可以直接接收到发射喇叭发射的微波,二者相干叠加而产生奇异峰,理论计算得到了奇异峰对应的掠射角,与实验测量数据吻合.
In the microwave Bragg diffraction experiment,the reason why singular peak is caused by the opening angle of emission horn on simulation crystal（100） surface has been analyzed.Because microwave emitted by horn is not strictly plane wave,there exists a critical grazing angle when Bragg diffraction happens.When the grazing angle is less than the critical angle,receiving horn can not only received the crystal surface reflection wave,can also receive directly microwave emitted by horn,their coherence stack arises singular peak.The grazing angle corresponding to singular peak has been calculated,and it is consistent with the experimental data.
出处
《大学物理》
北大核心
2013年第10期38-40,共3页
College Physics
基金
北京科技大学研究型教学示范课建设项目(JY2011SFK18)
北京科技大学教育教学改革研究项目(重点)(JG2011Z14)资助
关键词
微波
布拉格衍射
奇异峰
microwave
Bragg diffraction
singular peak
