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首页> 外文期刊>Research journal of applied science, engineering and technology >Influence of Electrical Double Layer in the Electrical Model for Capacitance-based Soil Moisture Sensor on Measuring Soil Moisture
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Influence of Electrical Double Layer in the Electrical Model for Capacitance-based Soil Moisture Sensor on Measuring Soil Moisture

机译：电容式土壤水分传感器电学模型中电双层对土壤水分测量的影响

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摘要

The reasonable electrical model for Capacitance-Based Soil Moisture Sensor (CBSMS), namely relationship between soil moisture and sensor output voltage, is the basic requirement of soil moisture measurements. In the present study, two CBSMS (PA-1 for the self-developed CBSMS and EC-5 for decagon company's CBSMS) were employed to assess influence of electrical double layer in the electrical model for CBSMS on measuring soil moisture based on 15 soil samples with moisture ranging from 2.6～30%. Results showed that significant deviations of experimental results and estimated values were determined mainly in dependence on the electrical models (Model-1: with electrical double layer, Model-2: without electrical double layer), soil moisture range and sensor itself. Significant deviations were observed in the moisture range of 2.6～6%, 22～30% for EC-5 and of 2.6～10%, 22～30% for PA-1 with Model-2, whereas the deviations did not exist for both CBSMS in the moisture range of 2.6～10% with Model-1. For both CBSMS, in the moisture range of 22～30%, the deviation between estimated values from Model-1 with experimental results was obviously less than that from Model-2. These results suggest that the electrical double layer should be considered in the electrical model for CBSMS, especially for measuring low soil moisture.
机译：基于电容的土壤水分传感器（CBSMS）的合理电气模型，即土壤水分与传感器输出电压之间的关系，是土壤水分测量的基本要求。在本研究中，使用了两个CBSMS（用于自行开发的CBSMS的PA-1和用于decagon公司的CBSMS的EC-5）来评估CBSMS电气模型中电双层对基于15个土壤样品测量土壤湿度的影响水分在2.6〜30％之间。结果表明，实验结果和估计值的显着偏差主要取决于电模型（Model-1：带电双层，Model-2：不带电双层），土壤湿度范围和传感器本身。使用Model-2，EC-5的湿度范围为2.6〜6％，22〜30％，PA-1的湿度为2.6〜10％，22〜30％，但两者均不存在明显的偏差。使用Model-1，CBSMS的湿度范围为2.6〜10％。对于两种CBSMS，在22〜30％的湿度范围内，模型1的估计值与实验结果之间的偏差明显小于模型2的估计值。这些结果表明，在CBSMS的电气模型中应考虑电气双层，尤其是在测量低土壤湿度时。

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