摘要
行波波速是决定时域反射电缆测长系统测量精度的关键.为了减小波速的影响,研究了时域反射电缆测长中的波速特性,分析了行波传播速度和介电常数的频率特性,研究了电缆的材料特性和环境温度对电缆中行波传播速度的影响,总结了确定波速的依据.实验测量了行波信号在不同温度下的波速,给出了行波在PVC绝缘电缆中传播速度的温度补偿系数.实验结果表明,经过波速温度补偿后,时域反射电缆测长系统的测量精度得到显著提高.
Traveling wave velocity is the key to the measuring accuracy of the time-domain reflectometry cable length measurement system. To reduce the impact of velocity, the velocity characteristics of time domain reflectometry cable length measurement system are studied, the frequency characteristics of traveling wave propagation velocity and dielectric constant are analyzed, and the influence of cable material parameters and ambient temperature on traveling wave propagation velocity on cable is investigated. The basis for wave velocity is summed up. The signal propagation temperature compensation coefficient of traveling wave determining the velocity at different temperature is measured, and the propagation velocity in the PVC insulated cable is presented. Experimental results show that the measuring accuracy of the time-domain reflectometry cable length measurement system is improved significantly by velocity temperature compensation.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2011年第4期58-62,共5页
Journal of Harbin Institute of Technology
关键词
时域反射
电缆
波速
频率特性
温度补偿
time-domain reflectometry
propagation velocity
frequency characteristic
temperature compensation
