铁氧体环的导磁率及其品质因数的测量

 初级绕有线圈的铁氧体环形成电感，如果同时在其次级绕有偏磁线圈并加一直流电流，当此电流改变时，铁氧体导磁率会随之改变，绕有线圈的铁氧体环的电感量也就相应改变。加载了铁氧体环谐振腔的谐振阻抗与铁氧体导磁率、品质因数及腔体谐振频率的乘积成正比，而腔体谐振阻抗直接决定其所需功率的大小。讨论了铁氧体环导磁率和品质因数的测量原理，给出了测试装置的具体电路和测量结果。

Measurement of permeability and Q-factor of ferrite toroids

Winding coil on primary side of the ferrite toroid forms an inductor.The permeability of the ferrite changes with various biasing DC current in coils on secondary side of the ferrite.Thus the inductance of the ferrite changes correspondingly.In the process of designing RF cavity of CSR,ferrite is used for the loading material of cavity.The characteristic of ferrite directly determinds whether the cavity can meet the requirements of the product design or not.The impedance of the cavity decides how much RF power should be got.At the same time,the impedance is in direct proportion to the μQf.Obviously the measurement of ferrite material is very important.This paper presents the measurement principle of permeability and Q-factor of ferrite,it also gives the concrete circuit and results of measurement.