用于场景仿真的红外烟幕模型及其特性分析

Smoke Model for Infrared Scene Imaging Simulation and Characteristic Analysis

综合考虑烟幕的衰减作用和自身辐射,提出了一个可用于浸没于均质烟幕中场景的红外成像仿真计算的烟幕模型。从理论和红外场景成像仿真计算了烟幕的遮蔽率随衰减系数、观察距离、目标温度和烟幕等效温度的变化关系。理论推导表明烟幕的遮蔽率与衰减系数和观察距离相关,而与目标温度和烟幕等效温度无关;成像仿真结果则表明衰减系数和观察距离对遮蔽率的影响与理论预测一致,而烟幕等效温度和目标温度对遮蔽率也有轻微影响。分析了出现差异的原因,并讨论了理论方法和红外场景成像仿真计算遮蔽率的适用范围。

Based on the self-emission and the radiation attenuation function, an infrared screen smoke model for imaging simulation of infrared scene in even smoke media was proposed. The screening efficiencies related to the observation distance, the attenuation coefficient, the object temperature and the smoke equivalent temperature were calculated by theory and scene imaging simulation. Theoretically, the screen efficiency is relative to observation distance and the smoke attenuation coefficient, but is independent of the smoke equivalent temperature and the object temperature. The scene imaging simulation shows that the screen efficiency is strongly relevant to observation distance and the smoke attenuation coefficient which well matches the theory result, and it is also weakly associated with smoke equivalent temperature and object temperature. The reason leading to the difference was analyzed, and the applications of the theory and imaging simulation method were investigated.