18 May 2012 Role of moisture and density of sand for microwave enhancement of thermal detection of buried mines
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The main disadvantage of applying the IRT method is presence of plenty false indications in thermograms. A simple use of IRT equipment with better temperature resolution would not help in distinguishing the mines, since noise comes not from a camera, but from soil surface. Recognizing the role of moisture and density of sand and possibilities to express it quantitatively plays an important role. In our model of thermal properties of the soil the volumetric unit of the soil consists of mineral and organic particles, as well as water and air. All needed parameters can be calculated. Calculations of thermal signatures of the underground objects were made basing on 3D-heat equation for the sinus type heating of 3D model and cooling by convection. Measurements were made for field and laboratory stand-ups, using methodologies typical for "single-shot" measurements as well as analyses of transient processes based on sequence of thermograms. Results of simulations and measurements confirm expectation tha that high level of "radiant noises" is caused mainly by differences in the moisture and sand density levels.
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Waldemar Swiderski, Waldemar Swiderski, Pawel Hlosta, Pawel Hlosta, Jozef Jarzemski, Jozef Jarzemski, Leszek Szugajew, Leszek Szugajew, Jerzy Usowicz, Jerzy Usowicz, } "Role of moisture and density of sand for microwave enhancement of thermal detection of buried mines", Proc. SPIE 8357, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVII, 83570P (18 May 2012); doi: 10.1117/12.921335; https://doi.org/10.1117/12.921335

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