With the field model, the electrostatic field distribution were observed and the magnitude of the charged quantity is determined by electron holography.
采用这个模型，能用电子全息法观测由该点电荷所形成的静电场分布及荷电量的大小。
Nowadays there are many methods to observe the magnetic domain structure, including powder-pattern method, magneto-optical effect method and electron holography method, etc.
目前，磁畴观测的方法已有很多种，如粉纹图法、磁光效应法、电子全息法等。
Nowadays there are many methods to observe the magnetic domain structure, including powder-pattern method, magneto-optical effect method and electron holography method, etc.
目前，磁畴观测的方法已有很多种，如粉纹图法、磁光效应法、电子全息法等。
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