光学暗室内杂散激光能量分布模型仿真与测量

为了模拟1.06μm脉冲激光在暗室内壁多次漫反射后的能量分布,在对暗室内激光目标反射特性研究的基础上提出了神经网络叠加的算法,并建立了暗室内杂散激光能量分布数学模型;利用模型仿真得到了入射能量为1J的1.06μm脉冲激光漫反射能量分布图,分布图表明暗室的整体消光性能较好,但是个别壁面存在局部较强的反射区域,该区域的激光能量最大值约为3.5×10-4J;通过模型的理论计算与实际测量分别得到了监测探头的能量密度理论值与实测值,对两组数据的比对分析表明,理论值与实测值的最大和最小相对误差分别为10.7%与1.3%,并且两者的分布规律一致.结果表明,此模型具有较高的可信度和仿真精度,能够满足内场仿真试验的实际需求.

Simulation and measurement of scattering laser energy distribution in extinctive chambers

To simulate the scattering laser energy distribution of 1.06μm pulsed laser reflected multiple times by the inner wall of an extinctive chamber, after analyzing the laser scattering characteristics, a neural network superposition algorithm was put forward and the mathematical model for energy distribution was created. The laser energy distribution pattern under was simulated with 1J 1.06μm laser incident in the chamber. In some reflection area, the reflectance was high with maximal energy of 3.5×10-4J. Actual measurement and theoretical calculation were carried out respectively. Theoretical and measurement results were compared, the maximal and minimum relative error of actual and theoretical value was 10.7% and 1.3%, and both were in the consistent changing rule. All the results show the precision of model can meet the practical requirements of infield simulation tests.