目标红外热像的等效辐射-汇聚法数值模拟

发布时间：2018-02-26 11:45

本文关键词： 红外成像等效辐射光学汇聚蒙特卡罗法大气衰减红外传输区域分割　出处：《哈尔滨工业大学学报》2017年01期 　论文类型：期刊论文

【摘要】：为得到红外成像阵列面上的目标辐照强度分布,提出等效辐射-汇聚法.将目标红外成像过程分解为目标表面辐射场的产生和空间传输与红外系统中的汇聚成像两个阶段.采用蒙特卡罗法模拟目标表面的等效辐射形成及其向红外系统的传输过程;利用光学成像位置和光强变换关系确定目标任意点的成像方位及汇聚到成像点的辐照强度.以SDM标准飞机模型为对象,采用该方法模拟获得了不同探测角度下的红外热像,并与从红外成像阵列面发射光线的反向蒙特卡罗方法进行了计算效率的对比.计算结果表明:对于单个探测方位,等效辐射法与反向蒙特卡罗的计算效率相当;而对于多个探测方位,由于目标等效辐射(或辐射传递因子)的独立性和可复用性,相对于反向蒙特卡罗法,等效辐射-汇聚法能够提高计算效率,更便于工程应用.
[Abstract]:In order to obtain the target radiation intensity distribution on the infrared imaging array, An equivalent radiation-convergence method is proposed. The infrared imaging process of the target is decomposed into two stages: the generation of the radiation field and the spatial transmission of the target surface and the convergence in the infrared system. The Monte-Carlo method is used to simulate the equivalence of the target surface. Radiation formation and its transmission to infrared system; The imaging azimuth of the target at any point and the radiation intensity converging to the imaging point are determined by the relationship between the optical imaging position and the light intensity transformation. The infrared thermal images at different detection angles are obtained by using the SDM standard aircraft model as an object. The calculation efficiency is compared with that of the reverse Monte Carlo method which emits light from the infrared imaging array. The calculation results show that the equivalent radiation method is equivalent to the reverse Monte Carlo method for a single detection azimuth. For multiple detection azimuth, due to the independence and reusability of the target equivalent radiation (or radiation transfer factor), compared with the reverse Monte Carlo method, the equivalent radiation-convergence method can improve the computational efficiency and be more convenient for engineering application.
【作者单位】：哈尔滨工业大学能源科学与工程学院;
【基金】：国家自然科学基金(51176038,51106036)
【分类号】：TN219

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