辐射耦合的干扰分析

Analysis of Interference From Radiation Coupling

辐射耦合指电磁能量以射频电磁场的形式在空间传播,然后通过感受体耦合到电路形成干扰的一种能量传递过程。针对辐射耦合造成的电气设备和电子系统失灵现象,介绍了有关辐射耦合的辐射抗扰度,源场的远场、近场划分,波阻抗,感应噪声等基本概念,探讨了辐射屏蔽的机理。通过不同案例分析了DCS内程序丢失和通信中断的原因,并指出了机柜室射频电磁场强度的控制限值的重要性。

Radiation coupling refers to an energy transfer process in which electromagnetic energy propagates in space in the form of RF electromagnetic field,and then is coupled to the circuit through the receptor to form interference.Aiming at the failure of electrical equipment and electronic system caused by radiation coupling,the basic concepts of radiation immunity,far field and near field division of source field,wave impedance and induced noise of radiation coupling are introduced,and the mechanism of radiation shielding is discussed.The causes of program loss and communication interruption in DCS are analyzed through different cases,and the importance of the control limit of RF electromagnetic field intensity in cabinet room is pointed out.