灵敏度系数可调同轴脉冲电压探头  

Coaxial pulse voltage probe with adjustable sensitivity

作　　者：马如坡[1] 石立华[1] 程德军 张祥[1] 张辉[1] 

机构地区：[1]解放军理工大学电磁环境效应与光电工程国家级重点实验室,南京210007 [2]工程兵学院,江苏徐州221004

出　　处：《强激光与粒子束》2014年第1期236-241,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(50177133)

摘　　要：针对采用TEM小室或GTEM室校准测试时从输入端获取信号的需求,设计了一种同轴型脉冲电压探头;该探头为微分型输出,采用数值积分可获得脉冲电压波形;其灵敏度系数可调。仿真分析了不同结构探针对探头内部电场峰值分布及对端口特性阻抗的影响,对采用尖针形探针的同轴脉冲探头进行了实验验证,得到了其频域响应曲线和灵敏度系数,分析了灵敏度系数随探针到内导体中心距离变化的规律。仿真和实验结果表明,同轴脉冲探头内嵌的探针采用尖针形时,对端口特性阻抗的影响及内部电磁场的扰动都很小,可满足ns级瞬变脉冲测试校准需要。A coaxial pulse voltage probe is designed to measure the signal through the input of TEM cell or GTEM cell in calibrating electromagnetic pulse（EMP） sensors.The output differential signal of the probe can be converted by numerical inte gration to obtain the measured EMP field,and the measurement sensitivity can be adjusted.The peak E-field distribution and the port characteristic impedance of the probe with different monopoles are simulated and compared.A spiry monopole is selected according to the simulation.Experiment verification is carried out.The frequency response and the sensitivity of the fabricated prototype coaxial probe are measured.The variation of sensitivity coefficient with the distance between the spiry monopole and the inner-conductor center is obtained.The simulation and the experiment indicate that the spiry monopole has very small perturbation to the inner field and the impedance of the coaxial probe.This kind of probe can be used in the measurement and calibration of EMP with rise time of nanosecond level.

关 键 词：传导型电磁脉冲 同轴脉冲探头 测试校准 灵敏度系数 

分 类 号：TM93[电气工程—电力电子与电力传动]