![]() It is mainly the geometry which has been investigated. Ideas to designs of electrical sensors are discussed. ![]() Some Comsol FEM simulations have been performed on the coaxial cell, as well as on electric property sensors. A new electrical model for the coaxial probe is proposed, based on LC resonances. Other parts have been modeled with other elements of AC theory. A few equivalent circuits of transmission lines have been discussed, and one was chosen to represent the purely coaxial part of the coaxial cell. From these measurements it is obvious that the moisture affects the impedance of the measurement equipment and thus it is possible to use this method to measure moisture content, if one can determine the electrical model which describes the measurement system. Impedance frequency behavior of the measurement equipment is measured and presented, with different curves for different moisture content. Reference samples have been prepared in a geotechnical laboratory. Studies have been performed on the history of attempts of solving this problem, as well as current relevant research. This made the measurements of resistivity tricky to perform, some measurements were achieved and a new relation between moisture of the moist magnetite concentrate and resistivity is presented. This phenomenon is in general known from geochemistry of mineral rich clays. The DC resistivity of the moist magnetite concentrate is determined and some interesting phenomena, suggested to be self potential were discovered. It exists two setups, one inductive and one capacitive. In this master thesis, the electrical behavior that links the measured data to the macroscopic electro-magnetic properties is examined. The characterization of sample macroscopic electro-magnetic properties is done by using a coaxial cell, performing frequency spectra measurement. In our case the samples are moist magnetite concentrate. Thus one is believed to be able to do a precise estimate of the amount of moisture in a sample. Macroscopic electro-magnetic properties of the measured sample can be linked to those of the individual constituents of the sample. ![]() In this master thesis a foundation for a new way of measurement using transmission line theory, is laid out. ![]() Fast precise moisture measurement in mineral process plants, has long been a difficult problem. ![]()
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