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，水分子具有非凡的大型电偶极矩。通过光谱法测量偶极矩作为介电常数。然而，介电常数所获得的值受界面极化的影响，需要消除影响并从测得的介电常数中找出水分子偶极矩的净贡献。在微波（100MHz-10GHz）的频率范围内，介电常数主要受偶极矩的影响。因此，在该频率范围内土壤的介电常数的测量使得可以测量水分子的偶极力矩，而不会影响界面极化效应。在这项研究中，作者开发了一种新的频域折射率（FDR）理论，对二元恒定恒定测量的测量。基于这一理论，他对单个方面的测量进行了研究，这是一个很便利的方法。该方法已被证实可将其成功地用于体积的土壤水分测量，冷冻水测量，吸附的水检测和粘结水检测。此外，该方法可提供一种非常困难的土壤水分的快速和无损坏的工具，这些工具是非常困难的。也就是说，该方法使我们能够检测到土壤地层并测量土壤水分分布，这是土壤界面上的另一种宏观现象。