Radiometric Identification of Granular Materials
Keywords:microwave range, radiometry, radio-brightness temperature, thermal profile, electromagnetic wave polarization, granular materials
The paper shows a general possibility of remote identifi cation of granular materials that are sealed in a dielectric package by the methods of close positioning with the use of a developed radiometric measurement setup at the 8-mm wavelength to obtain polarized thermal portraits. As a result of the interaction between the electromagnetic wave and granular materials, which are considered unstructured systems in this study, the possibility to determine and to show the useful information as a thermal portrait occurs at the molecular level. The presented polarized thermal portraits of granular materials with close characteristics are visually distinguishable. If the portraits appear to be similar, then the preliminary treatment of data is held, which allows the substance identifi cation. It was experimentally proven that the radiometric methods can be used to determine the natural slope angle – a generalized parameter that characterizes all granular materials, regardless of properties and the particle size distribution. A connection between the natural slope angle and radiometric parameters of the granular materials is shown. The occurrence of coherent eff ects were registered during the passage of the electromagnetic wave through the unstructured systems. For a certain random combination of the size and the ratio of average electrical parameters, a sharp increase in received signal’s amplitude can be observed.
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