一种基于三角波窄脉冲序列的时域反射土壤水分测量方法

A TDR-based Method Using a Triangular-wave Pulse Train for Measuring Soil Water Content

在基于阶跃脉冲激励的时域反射测量原理基础上,提出了一种三角波窄脉冲序列激励的时域反射土壤介电特性测量方法.不仅给出了相应的理论分析依据,对土壤探针阻抗的频域特性也做了深入探讨,并通过实验研究检验了该方法的可行性.它为改进面向土壤水分测量的时域反射仪器设计提供了一种技术途径,可有效降低测量过程中高速脉冲发生器关键部件—雪崩晶体管的动态负载,提高测量速率.

A different time domain reflectrometry（TDR） instrument was developed using sequentially superimposed step pulse trains as excitation signals.This paper proposed use of a triangular-wave pulse to replace the conventional step pulse TDR-instrument toward improving soil water content determination.The theoretical analysis,which included the frequency domain characteristic of the soil probe and the experimental results demonstrated the feasibility of the proposed method.This measurement approach can significantly reduce the power consumption of the avalanche transistor used,thereby increasing the measurement efficiency.