时域反射电缆测长的波速特性研究

Study on Wave Velocity Characteristics in Time-Domain Reflectometry-based Cable Length Measurement

时域反射测长技术主要是依靠计算送入电缆的脉冲遇到阻抗不匹配点所反射的能量来对电缆进行测量。时域反射电缆测长技术原理简单、不会破坏电缆、不受电缆芯数和长度限制,从而得到了广泛的重视。在利用时域反射测量技术测量电缆长度的过程中波速是一个重要参数,其决定了所测量的电缆长度的精确度,因此研究了波速特性。

Time-domain reflectometric cable length measurement technology mainly depends on calculating the energy reflected by the impulse sent into the cable when it meets the impedance mismatch point to measure the cable.With respect to cable length measurement,time-domain reflectometry technology is simple in principle,non-hazardous to the cable,and is not limited by the number and length of cable cores.Wave velocity is an important parameter in the process of measuring cable length using time-domain reflectometry technology.Therefore,this paper mainly studies the wave speed characteristics.