TDT液位检测研究

Research on measuring liquid depth with time domain transmission

本文首先介绍的是常用的时域反射法来测量各种不同液面高度的原理,以及此种方法在实际应用中的缺陷。针对该种方法的不足,根据电波在不同介质中传播速度不同的特点进一步提出利用时域传输法,来更精确测量液面的高度。通过实际的实验测量数据,并对时域反射法液位测量法进行分析和比较,最后得出时域传输法具有测量简便、成本低、线性度好的特点,优于时域反射法方法。

At present time domain reflectometry （TDR） is most frequently used in liquid depth measuring of which the deficiency in practical application is also analyzed. To make up this shortage and get more precise liquid depth measuring we propose a time domain transmission solution on the fact that propagation velocity of electric wave vary in different medium. Experiment results show that TDT have more superiority in convenience cost and linearity in comparison with TDR.