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5 May 2010 Micro-calorimetric sensor for trace explosive particle detection
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A micro differential thermal analysis (DTA) system is used for detection of trace explosive particles. The DTA system consists of two silicon micro chips with integrated heaters and temperature sensors. One chip is used for reference and one for the measurement sample. The sensor is constructed as a small silicon nitride bridge incorporating heater elements and a temperature measurement resistor. In this manuscript the DTA system is described and tested by measuring calorimetric response of DNT (2,4-Dinitrotoluene). The design of the senor is described and the temperature uniformity investigated using finite element modelings and Raman temperature measurements. The functionality is tested using two different kinds of explosive deposition techniques and calorimetric responses are obtained. Under the framework of the Xsense project at the Technical University of Denmark (DTU) which combines four independent sensing techniques, these micro DNT sensors will be included in handheld explosives detectors with applications in homeland security and landmine clearance.
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Jesper K. Olsen, Anders Greve, N. Privorotskaya, L. Senesac, T. Thundat, W. P. King, and A. Boisen "Micro-calorimetric sensor for trace explosive particle detection", Proc. SPIE 7679, Micro- and Nanotechnology Sensors, Systems, and Applications II, 767929 (5 May 2010);

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