使用全变差和全平方变差正则化的电子摇摆曲线的相位反演。

Akihiro Shichi, Hiroyuki Ishizuka, Koh Saitoh
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引用次数: 0

摘要

在本研究中,提出了一种利用会聚束电子衍射观测到的电子摇摆曲线的相位恢复的新方法,该方法适用于确定沿束方向的三维晶格位移场。引入了全变分和全平方变分正则化用于相位恢复,以抑制对摇摆曲线中的噪声或背景信号的过拟合,并再现仅存在于晶格缺陷附近的位移场的稀疏特性。结果表明,该算法对受电子衍射动力学效应调制的摇摆曲线是有效的。文中还讨论了用该方法进行相位重构的精度。演示了从不锈钢中的堆叠故障获得的实验摇摆曲线的相位恢复。
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Phase retrieval of electron rocking curves using total variation and total squared variation regularizations.

In this study, a new method for the phase retrieval of electron rocking curves observed using convergent-beam electron diffraction, which is applicable to the determination of three-dimensional lattice displacement fields along the beam direction, is proposed. Total variation and total squared variation regularizations are introduced for phase retrieval to suppress overfitting to noise or background signals in the rocking curves and to reproduce the sparse characteristics of displacement fields, which exist only near lattice defects. The results show that the proposed algorithm is effective for rocking curves modulated by the dynamical effect of electron diffraction. The accuracy of phase reconstruction using the proposed method is also discussed. Phase retrieval of the experimental rocking curves obtained from a stacking fault in stainless steel is demonstrated.

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