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The main goal of surfacegauging radar applications is to obtain a complete image of a surface area inside a closed and possibly tightly sealed container filled with materials having sufficient reflectivity for highfrequency electromagnetic waves. Radar systems are applicable where standard acoustical or optical measurement techniques are strongly impaired due to harsh environmental conditions-such as extreme dust, heat, occasional heavy humidity, and aggressive chemicals-that occur, for example, inside a fully operative blast furnace.
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Zankl et al. (2017) studied this question.
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