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

机译：用于土壤水分的Access-Tube TDR传感器的设计：测试

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摘要

Soil water measurement is important in water management for irrigation and in hydrologic sciences. The purpose of this paper is to develop and test the design of a cylindrical access-tube mounted waveguide for use in time-domain reflectometry (TDR) for in situ soil water content sensing. Several prototypes with varying geometrical parameters were constructed. The sensors were compared by evaluating the characteristics of reflected waveforms from a (200-ps) step pulse in different media, including air, triethylene glycol, deionized water, and over a range of water contents in sand and a clay loam soil. Sensors with greater separation between electrodes, achieved by means different tube diameters or the separation angles, tend to have greater field penetration in both sand and clay. In addition, sensors with the shortest electrode separation show greater sensitivity to soil electrical conductivity. Together, these trends demonstrate that the propagating electromagnetic fields above 0 Hz do not take the transverse electromagnetic form commonly assumed in the analysis of TDR probes.
机译：土壤水测量在灌溉用水管理和水文科学中很重要。本文的目的是开发和测试用于时域反射测量（TDR）的原位土壤水分感测的圆柱形接入管安装波导。构造了几个具有不同几何参数的原型。通过评估来自（200 ps）阶跃脉冲在不同介质（包括空气，三甘醇，去离子水）以及沙子和粘土壤土中水含量范围内的反射波形的特性，对传感器进行了比较。通过不同的管子直径或分隔角实现的电极之间的分隔更大的传感器，往往在沙子和粘土中都有更大的磁场穿透力。此外，电极间距最短的传感器对土壤电导率显示出更高的灵敏度。总之，这些趋势表明，高于0 Hz的传播电磁场没有采取TDR探头分析中通常假定的横向电磁形式。

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