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xie lou dian lan
Author(s): 
Pages: 18
Year: Issue:  5
Journal: Optical Fiber & Electric Cable and Their Applications

Keyword:  泄漏电缆外屏蔽串联阻抗检测传感器灵敏度变化内导体电缆管道电磁场入侵者同轴电缆;
Abstract: <正> 作为天线或作为入侵者检测传感器的泄漏电缆不是埋在电缆管道里就是敷设在地面上,事实上这会降低由于环境引起的灵敏度变化。磁场的逸出阻止电场从电缆的泄漏。外面传播的电磁场的速度变慢并被衰减。具体说,泄漏同轴电缆由内导体、内导体外面的绝缘,第一层外屏蔽,第二层外屏蔽组成。第一层外屏蔽在VHF频率具有低串联阻抗,它起耦合磁场的作用;第二层外屏蔽有高串联阻抗,它起限制两层屏蔽
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