From Event: SPIE Optical Engineering + Applications, 2017
Evaluating the performance of infrared (IR) flare as an active countermeasure, the similarity between an actual signal of flare and emission of an aircraft exhaust plume is important. In order to predict the actual signal of flame, exact knowledge of theoretical modeling of the flare spectrum considering realistic measurement environment is required. In this study, we conduct a line-by-line modeling of IR flare. We calculate the spectral line parameters of IR flare using high-temperature molecular spectroscopic database (HITEMP) and chemical parameters using ICT thermodynamic code in thermodynamic equilibrium condition. We consider a collisional broadening of the spectral lines under atmospheric pressure, and instrument function of spectrometer. Also, we apply an atmospheric transmission with varying altitudes, measurement angles, and humidity based on moderate resolution atmospheric transmission database (MODTRAN). Finally, we verify our modeling of IR flare by comparing with experimental results. The normalized RMS deviation between the measured and modeled data is calculated to be about 6.7%.
Acknowledgement: This work was supported by the Low Observable Technology Research Center program of Agency for Defense Development (ADD).
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