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首页> 外文期刊>Sensors Journal, IEEE >Design of Access-Tube TDR Sensor for Soil Water Content: Theory
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Design of Access-Tube TDR Sensor for Soil Water Content: Theory

机译：土壤水分存取管TDR传感器的设计：理论

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摘要

Soil water measurement is important in water management for irrigation and hydrologic sciences. The purpose of this paper is to describe the design of a cylindrical access-tube mounted waveguide for use in time-domain reflectometry (TDR) for in-situ soil water content sensing. In order to optimize the design with respect to sampling volume and losses, we derived the electromagnetic fields produced by a TDR sensor with this geometry. Using this analytical derivation, the effects on sampling area, waveform shape, and losses while varying design and soil water content were examined. It was found that when the soil and tube substrate have identical dielectrics, then sampling area has a local extremum. Tube radius has the largest impact of any geometrical parameter on sampling area with increases in radius causing increases in sampling area. Increasing electrode separation angle increases the sampling area slightly. The effects on TDR waveform are greatest for soil water content, tube dielectric, and tube radius: where increasing any of these increase delay and dispersion.
机译：土壤水测量在灌溉和水文科学的水管理中很重要。本文的目的是描述用于时域反射测量（TDR）的原位土壤水分感测的圆柱形接入管安装波导的设计。为了针对采样量和损耗优化设计，我们推导了具有这种几何形状的TDR传感器产生的电磁场。使用这种分析推导，研究了在改变设计和土壤含水量的情况下对采样面积，波形形状和损耗的影响。发现当土壤和管基质具有相同的电介质时，则采样区域具有局部极值。管半径在任何几何参数上对采样面积的影响最大，随着半径的增加导致采样面积的增加。电极间隔角的增加会稍微增加采样面积。对于土壤水分，管介电常数和管半径，对TDR波形的影响最大：增加这些都会增加延迟和扩散。

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