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A Study on Electro-chemical Phenomena on Soil Surface and Its Application

土壤表面电化学现象及其应用研究

基本信息

批准号：
04660255
负责人：
MITSUNO Toru
金额：
$ 1.41万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04660255/
关键词：
electric dipole moment dielectric constant micro wave FDR (Frequency Domain Reflectmetory)frozen water adsorbed water bonding water nondestructive in si-tu measurement of soil moisture 土層境界界面電気現象高周波誘電率水分子土壌物理性

项目摘要

A water molecule is known to have an extraordinary large electric dipole moment. The dipole moment is measured as a dielectric constant by a spectroscopy. However, the obtained values of the dielectric constants are affected by polarization of the interface, it is needed to eliminate the influence and to find out net contribution of the dipole moment of water molecules from the measured dielectric constants. In a frequency range of micro-wave (100MHz-10GHz), dielectric constants are affected mainly by the dipole moment. Therefore, the measurement of dielectric constants of a soil in this frequency range make it possible to measure the dipole moment of the water molecule with no disturbance of interface polarization effect.In this study, the author developed a new theory of Frequency Domain Refractometry (FDR) on dielectric constant measurement.Based on the theory, he developed a single prove method which is quite convenient in both laboratory and field measurement. This method was confirmed to be applied successfuly to volumetric soil moisture measurement, frozen water measurement, adsorbed water detection and bonding water detection, as well.In addition, the method was found to offer a powerful tool for quick and nondestructive in si-tu measurement of soil moisture which had been considered very difficult. Namely, the method enables us to detect soil strata and to measure soil moisture distribution, that is another macroscopic phenomena at a soil interface.

众所周知，水分子具有非常大的电偶极矩。偶极矩由光谱学测量为介电常数。然而，得到的介电常数受界面极化的影响，需要消除这种影响，并从测量的介电常数中找出水分子偶极矩的净贡献。在微波(100 MHz-10 GHz)频率范围内，介电常数主要受偶极矩的影响。因此，在这个频率范围内测量土壤的介电常数，使得在不受界面极化效应干扰的情况下测量水分子的偶极矩成为可能。在本研究中，作者提出了一种新的频域折射率法(FDR)测量介电常数的新理论，并在此基础上提出了一种在实验室和野外测量都非常方便的单一证明方法。该方法已成功应用于体积土壤水分测量、冻水测量、吸附水检测和结合水检测，为土壤水分的快速、无损测量提供了有力的工具。也就是说，该方法使我们能够探测土层和测量土壤水分分布，这是土壤界面上的另一种宏观现象。