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Soil Moisture Measurement Method Based on TDR Using Phase Detecting Technology

机译：基于TDR的相位检测技术在土壤水分测量中的应用

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摘要

Time domain reflectometry (TDR) is widely used in soil moisture measurement due to its advantages of high accuracy and stability. In this paper a new method is presented to determine soil moisture based on TDR using phase detecting technology (called P-TDR). Single-frequency sinusoidal voltage signal was adopted as test signal to replace voltage pulse with very short rise-time, i.e. phase detector was used instead of high-speed sampling oscilloscope for P-TDR. The phase error between reflected signal and incident signal was measured in order to calculate the travel time of test signal along the probe embedded in moist soil, from which the soil's volumetric water content will be inferred. The system shows high accuracy and resolution in travel time measurement. Through calibration, measuring deviations is less than 0.02m3/m3 between P-TDR system and standard gravimetric sampling method,which can be achieved in loam soil with volumetric water content up to 0.5m3/m3.
机译：时域反射仪（TDR）由于具有高精度和高稳定性的优点而被广泛用于土壤湿度测量。本文提出了一种使用相检测技术（T-TDR）基于TDR测定土壤水分的新方法。采用单频正弦电压信号作为测试信号来代替上升时间非常短的电压脉冲，即使用相位检测器代替P-TDR的高速采样示波器。测量反射信号和入射信号之间的相位误差，以便计算测试信号沿着嵌入潮湿土壤中的探头的传播时间，从中可以推断出土壤的体积含水量。该系统在行程时间测量中显示出很高的精度和分辨率。通过校准，P-TDR系统与标准重量采样方法之间的测量偏差小于0.02m3 / m3，这可以在体积水含量高达0.5m3 / m3的壤土中实现。

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