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单词 Barkhausen noise
释义

Barkhausen noise

中文百科

巴克豪森效应 Barkhausen effect

(重定向自Barkhausen noise)

巴克豪森效应英语:Barkhausen effect)指将铁磁材料从退磁状态加磁场磁化到饱和,在中间阶段,铁磁材料是以磁畴突然长大,不可逆和不连续位移过程实现磁化的。磁畴的这种运动方式,称为巴克豪森效应。它是德国物理学家海因里希·巴克豪森于1919年发现的。

巴克豪森效应说明二点:在磁化的中间阶段,铁磁材料以磁畴完成磁化;而不是以单个原子完成磁化。巴克豪森效应提供了磁畴存在的直接证据,而存在磁畴是法国物理学家皮埃尔·外斯对铁磁性解释所提出的二个基本假设之一。

英语百科

Barkhausen effect 巴克豪森效应

(重定向自Barkhausen noise)
Replica of Barkhausen's original apparatus, consisting of an iron bar with a coil of wire around it (center) with the coil connected through a vacuum tube amplifier (left) to an earphone (not shown).  When the horseshoe magnet (right) is rotated, the magnetic field through the iron changes from one direction to the other, and the crackling Barkhausen noise is heard in the earphone.
Magnetization (J) or flux density (B) curve as a function of magnetic field intensity (H) in ferromagnetic material. The inset shows Barkhausen jumps.
Domain moves with a Barkhausen jump
A set-up for non-destructive testing of ferromagnetic materials: green – magnetising yoke, red – inductive sensor, grey – sample under test.

The Barkhausen effect is a name given to the noise in the magnetic output of a ferromagnet when the magnetizing force applied to it is changed. Discovered by German physicist Heinrich Barkhausen in 1919, it is caused by rapid changes of size of magnetic domains (similarly magnetically oriented atoms in ferromagnetic materials).

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更新时间:2025/6/18 23:16:38