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首页> 美国卫生研究院文献>Materials >Dielectric Properties of Glass Beads with Talc as a Reference Material for Calibration and Verification of Dielectric Methods and Devices for Measuring Soil Moisture
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Dielectric Properties of Glass Beads with Talc as a Reference Material for Calibration and Verification of Dielectric Methods and Devices for Measuring Soil Moisture

机译：以滑石粉为参考材料的玻璃微珠的介电特性用于介电方法和土壤水分测量装置的校准和验证

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摘要

This paper presents dielectric measurements of talc, glass beads, and their mixtures under different moisture and salinity levels. The measurements were conducted using a prototype seven-rod probe (15 mm long central rod) connected to a single port of vector network analyzer. The samples were moistened with distilled water and KCl solutions in order to obtain six different moisture content levels. The complex dielectric permittivity was determined from vector network analyzer reflection-coefficient measurements based on the open-water-liquid calibration procedure. Next, the fitting of volumetric water content–real part of dielectric permittivity calibration curves was performed for each material at selected frequencies, and the obtained relations were compared with well-known calibration equations. Additionally, a salinity index for the tested materials was calculated. It was concluded that pure talc is not an optimal material for the calibration and verification of dielectric methods. The calibration curves obtained for glass beads and the mixtures of glass beads with talc gave results close to well-known reference calibration functions. Additionally, the addition of talc caused the data points to be less scattered. Moreover, the values of the salinity index for the tested materials were in a good agreement with literature data for sand. The obtained results indicated that glass beads with the addition of talc can be used as a reference material for the calibration and verification of dielectric methods and devices for soil moisture measurement.
机译：本文介绍了在不同湿度和盐度下滑石，玻璃珠及其混合物的介电测量值。使用连接到矢量网络分析仪单个端口的原型七杆探针（中心杆长15 mm）进行测量。用蒸馏水和氯化钾溶液润湿样品，以获得六个不同的水分含量水平。基于开放水-液体校准程序，通过矢量网络分析仪的反射系数测量来确定复介电常数。接下来，对每种材料在选定的频率下进行体积水分含量-介电常数校准曲线实部的拟合，并将获得的关系与众所周知的校准方程式进行比较。另外，计算了被测材料的盐度指数。结论是，纯滑石不是用于介电方法的校准和验证的最佳材料。对于玻璃珠以及玻璃珠与滑石的混合物获得的校准曲线得出的结果接近众所周知的参考校准函数。此外，滑石粉的添加使数据点的分散程度降低。此外，被测材料的盐度指数值与砂的文献数据非常吻合。获得的结果表明，添加了滑石粉的玻璃珠可以用作介电方法和土壤水分测量装置的校准和验证的参考材料。

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