2005/03/04 | 透入深度[Skin Depth]
类别(Ω〖物理〗) | 评论(0) | 阅读(60) | 发表于 14:37
The skin depth of a substance is the distance to which incident electromagnetic radiation penetrates. In cgs,


(1)

where H is the magnetic field in matter, B is the magnetic field, is the permeability,c is the speed of light,J is the volume current,D is the electric field in matter, is the electrical conductivity,and is the electric field.
For a conductor,, so
(2)

(3)

(4)

This is a diffusion equation. Write
(5)

where is the angular frequency. Then
(6)

(7)

(8)

So the skin depth is given by
(9)

A transverse electromagnetic wave therefore satisfies
(10)

(11)

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