Military Technical College, Egypt
Title: Infrared spectra of aluminum fluorocarbon polymer compositions to thermal signature of jet engine
Biography: Amir Elsaidy
Decoy flares are energetic materials, which are capable of yielding thermal signature to interfere with IR guided missile seekers. The flare thermal signature depends on the duration and intensity of the exothermal reaction and on the chemical nature of the combustion products. Aluminum is the preferred metallic fuel for different pyrotechnic compositions because of its high stability and (high heat source), while magnesium runs in the second place due to lack of its stability. Aluminum is widely employed in wide applications particularly thermite compositions and flare compositions. In this study, different decoy flare formulations based on aluminum/Teflon/Viton (ATV) (with fuel percentage ranging from 40:70 wt %) were prepared by granulation and subsequent pressing. The spectral performance of developed decoy flare formulations were measured to the thermal signature of jet engine nozzle using (FT-MIR 2-6 µm) spectrophotometer. The thermal signature of jet engine was characterized with two characteristic peaks over α band (2-3 µm) and β band (3-5 µm); this thermal signature was correlated to black body emission by the nozzle at 690°C. The characteristic intensity ratio ɵ=Iα/Iβ=0.3. The developed decoy flares offered similar thermal signature but with higher intensity due to the formation of carbon soot and AlF as nearly ideal emitter and active IR emitter respectively. Quantification of these emitting species and combustion temperature was conducted using the ICT thermodynamic code. ATV decoy flare with 50wt % Al offered an increase in the intensity of α band and β by 6 and 1.5 times respectively. The main IR emitting species in this formulation is (AlF) in the combustion flame. The characteristic intensity ratio Ɵ was found to be 0.73. This manuscript would open the route for the development of customized decoy flares with tailored spectral performance.