Electron beam moiré fringes imaging by image converter tube with a magnetic lens
Electron beam moiré fringes imaging by image converter tube with a magnetic lens
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DOI：
10.1063/1.4952750
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发表时间：
2016-06
影响因子：
3.2
通讯作者：
Yubo Liao;Yunfei Lei;Hou-zhi Cai;Yanli Bai;Jinyuan Liu
中科院分区：
文献类型：
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作者：
Yubo Liao;Yunfei Lei;Hou-zhi Cai;Yanli Bai;Jinyuan Liu
利用带磁透镜的变像管获得电子束形成的莫尔条纹的静态像。这些莫尔条纹是由于阳极网和包含各种空间频率的狭缝的光阴极之间的干涉而形成的。在3.5kV的加速电压下观察到莫尔条纹，需要1550安匝的磁激励条件。不仅分析了条纹的特征，而且还研究了条纹间距随旋转角的变化。实验结果与理论分析相吻合。通过改变旋转角度或调节磁透镜的激励条件，我们也能记录平行莫尔条纹和二次莫尔条纹。二次莫尔条纹可以在-39.5 °到-50.6 °的旋转角范围内观察到。理论分析表明，二次莫尔条纹是由光阴极狭缝与阳极网格的二维周期性结构干涉而形成的。将我们提出的莫尔方法与脉冲膨胀技术相结合，可能会为未来的应用打开大门，在各个领域，包括但不限于超快电脉冲诊断。
An image converter tube with a magnetic lens was used to obtain static images of moire fringes formed by electron beam. These moire fringes are formed due to the interference between the anode mesh and the photocathode containing slits of various spatial frequencies. Moire fringes are observed at an accelerating voltage of 3.5 kV requiring the magnetic excitation condition of ∼550 ampere-turns. Not only the features of the fringes are analyzed but also the change of fringe spacing as a function of the rotation angle is investigated. The experimental results are found well in agreement with the theoretical analysis. By changing the rotation angle or adjusting the excitation condition of the magnetic lens, we were able to record parallel moire and secondary moire fringes too. The secondary moire fringes can be observed in the rotation angle range of −39.5° to −50.6°. The theoretical analysis indicates that the secondary moire is formed by the interference between the photocathode slits and the 2-D periodic structure of the anode mesh. Combining our proposed moire method with the pulse-dilation technique may potentially open the door for future applications, in various fields including, but not limited to, ultrafast electrical pulse diagnostics.