反射计
电介质
介电常数
材料科学
含水量
时域
电阻率和电导率
衰减
多孔介质
电导率
校准
多孔性
土壤科学
复合材料
环境科学
光电子学
光学
化学
地质学
岩土工程
计算机科学
电气工程
物理
物理化学
工程类
计算机视觉
量子力学
作者
Scott B. Jones,Jon M. Wraith,Dani Or
摘要
Abstract Time domain reflectometry (TDR) is a highly accurate and automatable method for determination of porous media water content and electrical conductivity. Water content is inferred from the dielectric permittivity of the medium, whereas electrical conductivity is inferred from TDR signal attenuation. Empirical and dielectric mixing models are used to relate water content to measured dielectric permittivity. Clay and organic matter bind substantial amounts of water, such that measured bulk dielectric constant is reduced and the relationship with total water content requires individual calibration. A variety of TDR probe configurations provide users with site‐ and media‐specific options. Advances in TDR technology and in other dielectric methods offer the promise not only for less expensive and more accurate tools for electrical determination of water and solute contents, but also a host of other properties such as specific surface area, and retention properties of porous media. Copyright © 2002 John Wiley & Sons, Ltd.
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