直线加速器KD7767自动频率控制系统  

Automatic Frequency Control(AFC)system on SIEMENS KD7767linear accelerator

作　　者：蔡汉飞[1] 王飞[1] 任克杰[1] 

机构地区：[1]蚌埠医学院附属医院,安徽蚌埠233004

出　　处：《医疗设备信息》2004年第5期32-33,共2页Information of Medical Equipment

摘　　要：如其他谐振腔一样 ,波导频率会随温度和其他外部条件而变化。为了使得射频源和波导管的频率保持一致 ,采用了自动频率控制系统 (AFC)。AFC系统包括三个主要部分 :(1)鉴相系统 ,(2)信号处理 ,(3)调节系统。本文讨论了AFC的基本工作原理。重点分析了三分贝环行电桥的鉴相特性。Like all resonant cavities,the waveguide frequency has a tendency to drift due to temperature and other exˉternal conditions.In order to make the RF source and the waveguide have the same resonant frequency,the automatic frequency control(AFC)system is used.The AFC system consists of three major sections:(1)phase detection system,(2)signal process,and(3)regulating system.The fundamental principle of AFC system is discussed and the phase deˉtection characteristics of hybrid ring is emphatically analyzed in this paper.

关 键 词：自动频率控制 三分贝环行电桥 

分 类 号：R563[医药卫生—呼吸系统]