Microwave Dielectric Behaviour of Wet Soils


Book Description

This book offers detailed discussion of dielectric measurement and behaviour of wet soil, from theoretical and experiment points of view. The author describes numerous microwave measurement techniques and protocols, and shows how to evaluate and choose among them. The book is written primarily with the requirements of interdisciplinary researchers in agriculture and soil science in mind.




Microwave Dielectric Behaviour of Wet Soils


Book Description

This book offers detailed discussion of dielectric measurement and behaviour of wet soil, from theoretical and experiment points of view. The author describes numerous microwave measurement techniques and protocols, and shows how to evaluate and choose among them. The book is written primarily with the requirements of interdisciplinary researchers in agriculture and soil science in mind.
















Applications of Remote Sensing to Agrometeorology


Book Description

Within the framework of Ispra Courses, a course on "Applications of Remote Sensing to Agrometeorology" was held from April 6th to 10th, 1987 at the Joint Research Centre of the European Communities, Ispra Italy. The purpose of the course was to familiarize scientists, active in Agrometeorology and related fields, with remote sensing techniques and their potential applications in their respective disciplines. Conventional ground investigations in various fields of natural sciences such as hydrology, pedology and agrometeorology can be supple mented by a range of instruments carried by airborne or earth orbiting platforms. The last few years, in particular, have seen many developments in this respect and a growing amount of information can now be derived not only from dedicated earth resources satellites such as the LANDSAT and SPOT, but also from other platforms such as METEOSAT and the series of NOAA-TIROS. Future platforms (ERS-l, Space Station, etc.) with their advanced sensors will further broaden the range of applications open to the investigators. The use of these data sources, together with field investigations, can lead, at a reduced cost, to a better characterization of the spatial and temporal properties of natural systems.




Microwave Dielectric Behavior of Soils. Report 1. Summary of Related Research and Applications


Book Description

As a precursor to developing a well-documented database of complex electrical properties of soils as a function of signal frequency, sample moisture, sample temperature, and soil type, a comprehensive study of existing data collection methodology and analytical modeling was undertaken. Of particular utility are chronological tables of experimental and analytical milestones as well as an extensive reference list. Several appendices are included that are helpful in understanding soil-electromagnetic wave interactions and new concepts in modeling soil structure. Complex dielectric constant, Microwave, Soil, Conductivity, Permittivity.




Microwave Dielectric Behavior of Soils. Report 2. A Unique Coaxial Measurement Apparatus


Book Description

A reflection/transmission laboratory apparatus and data collection methodology are described that can be used to measure the complex dielectric response of moist soils over the 100 MHz-18 GHz frequency range. The experimental setup includes a square cross-sectional coaxial sample holder, a vector network analyzer system for signal generation and detection, and an external bath for sample temperature control. Data collected on liquids whose dielectric response is well known verify that the electrical property calculation algorithm functions properly. Complex dielectric constant, Permittivity, Conductivity, Soil, Microwave.




Measurements of the Dielectric Properties of Wet Snow Using a Microwave Technique


Book Description

An accurate method of measuring liquid water in snow covers is required to determine the properties of wet snow. The dielectric properties of wet snow must be utilized to adequately measure its liquid water content. In this study the effect of liquid water on the complex dielectric constant of natural snow is determined in the microwave frequency range. Deloor's method for calculating the dielectric constant for mixtures and the results of waveguide experiments on samples of wet snow and glass beads are used to construct a calibration curve relating the measured dielectric loss factor directly to the water content of wet snow. The results are independent of porosity, past history and chemical impurities. A relation between the effective dielectric constant and the porosity and water content is proposed and tested experimentally. The general nature of this relation is described and suggestions are made for the development of a more precise relation. It is concluded that the dielectric constant is a function of porosity and water content only.