24 September 2009 Modelling of thermal emissivity of covered bulk explosive materials in the THz range
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Abstract
Detection and recognition of covered explosive materials in the THz range can be devided into two areas - passive and active systems. Passive systems in the submilimeter (100÷300 GHz) as well as the terahertz (0.3÷3 THz) range base on thermal emissivity of exemined bodies. Such devices are designed to control persons and baggage in airports mainly at the temperature about 300K. Thermal emissivity of real bodies can be obtained from the Planck's formula for perfect black bodies and an emissvity coefficient. The emissivity coefficient of the real bodies can be determined from laboratory measurements of spectral transmission and reflection for the specific materials. However, values of the thermal emissivity detected in real cases depend strongly on surface of the material, direction of detection in relation to normal to the emitting surface, atmosphere and covering materials. These factors introduce attenuation of the emissivity what can cause camouflage of the characteristic features of individual materials and makes them difficult to identify. In this paper we present the value of the emissivity of hexogen (RDX) based on transmission measurements in FTIR spectrometer. The obtained emissivity is used to simulate intensity of radiation on an aperture.
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Wieslaw M. Ciurapinski, Wieslaw M. Ciurapinski, Mieczyslaw Szustakowski, Mieczyslaw Szustakowski, Norbert Palka, Norbert Palka, Marek Zyczkowski, Marek Zyczkowski, Radoslaw Ryniec, Radoslaw Ryniec, Marek Piszczek, Marek Piszczek, Pzemyslaw Zagrajek, Pzemyslaw Zagrajek, } "Modelling of thermal emissivity of covered bulk explosive materials in the THz range", Proc. SPIE 7485, Millimetre Wave and Terahertz Sensors and Technology II, 74850P (24 September 2009); doi: 10.1117/12.830052; https://doi.org/10.1117/12.830052
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