中国激光, 2006, 33 (suppl): 388, 网络出版: 2006-04-21
尾焰红外辐射的光谱特性及空间分布特性的计算
Computation on Spectral and Spatial Distribution Characteristics of Infrared Radiation of Plume
摘要
对飞机尾焰红外辐射的光谱特性及空间分布特性进行研究,将满足对飞行器探测或防护的需求。采用Curtis-Godson(C-G)近似得到气体分子的吸收谱线,进而通过解辐射传输方程,计算得到了飞机尾焰红外辐射的光谱特性及空间分布特性。通过对所有平行采样视线的积分获得某一观测方向的尾焰辐射强度,并采用自适应坐标法大大减少了计算量。由于高温二氧化碳和水气的分子发射辐射谱带的存在,尾焰在以2.7 μm和4.3 μm为中心的两个波段内有较强的辐射,经大气传输后2.7 μm和4.3 μm波段的辐射强度大大降低。尾焰红外辐射由于观测方向的不同而具有不同的光谱分布和辐射强度。在前向观测时,明显具有2.7 μm和4.3 μm为中心的两个强的辐射带。后向观测时的辐射较强,而且选择性辐射的特点不太突出。
Abstract
The study on spectral and spatial distribution characteristics of infrared radiation of plume is useful for the demand of detection or defense mechanism of aircraft. The absorption spectrums of gas molecule are obtained by Curtis-Godson approximation. The spectral and spatial distribution characteristics of infrared radiation of plume are computed by solution of radiation transfer equation. The plume radiation intensity of a certain observation direction is obtained by integral on all parallel sample lines of sight. The calculation is reduced by adoption of adaptive coordinates method. There is strong plume radiation in the two bands of 2.7 μm and 4.3 μm due to molecular emission bands of high temperature CO2 and H2O, while the radiation intensity in the two bands greatly decreases after atmosphere propagation. The plume spectrum distribution and radiation intensity vary versus the observation direction. There are two distinct radiation bands of 2.7 μm and 4.3 μm when observed from the front. When observed in the backside, the radiation is much stronger and the characteristic of selective radiation is not so clear.
万敏, 冷杰, 杨锐, 路大举, 黄志伟. 尾焰红外辐射的光谱特性及空间分布特性的计算[J]. 中国激光, 2006, 33(suppl): 388. 万敏, 冷杰, 杨锐, 路大举, 黄志伟. Computation on Spectral and Spatial Distribution Characteristics of Infrared Radiation of Plume[J]. Chinese Journal of Lasers, 2006, 33(suppl): 388.