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Correcting the Temperature Influence on Soil Capacitance Sensors Using Diurnal Temperature and Water Content Cycles

机译：利用昼夜温度和水分循环校正温度对土壤电容传感器的影响

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The influence of temperature on the dielectric permittivity of soil is the result of counteracting effect that depends on the soil's composition and mineralogy. In this paper, laboratory experiments showed that for a given water content, the soil dielectric permittivity was linearly related to the temperature, with a slope (α) that varied between samples taken in the same soil. These variations are difficult to predict and therefore, a simple and straightforward algorithm was designed to estimate α based on the diurnal patterns of both the measured dielectric permittivity and the soil temperature. The underlying idea is to assume that soil water content variations can be known with a reasonable accuracy over an appropriate time window within a day. This allows determining the contribution of the soil water content to the dielectric permittivity variations and then, the difference with the observed measurements is attributed to the soil temperature. Implementation of the correction methods in a large number of experiments significantly improved the physical meaning of the temporal evolution of the soil water content as the daily cycles for probes located near the surface or the long-term variations for more deeply installed probes.
机译：温度对土壤介电常数的影响是抵消作用的结果，抵消作用取决于土壤的组成和矿物学。在本文中，实验室实验表明，对于给定的水分含量，土壤介电常数与温度呈线性关系，在相同土壤中采集的样品之间的斜率（α）有所不同。这些变化很难预测，因此，设计了一种简单明了的算法，根据测得的介电常数和土壤温度的日变化模式来估算α。基本思想是假设可以在一天的适当时间范围内以合理的准确度知道土壤含水量的变化。这可以确定土壤含水量对介电常数变化的贡献，然后，与观测值的差异归因于土壤温度。大量实验中校正方法的实施显着改善了土壤含水量随时间变化的物理意义，这是因为靠近地表的探头的每日周期或安装得较深的探头的长期变化。

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