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针对氢氧火箭发动机羽烟紫外辐射特性参数分析,提出一种基于紫外CCD(change coupled de-vice)相机采集的单幅辐射图像,同时反演羽烟内紫外辐射源项和吸收系数的方法.该方法将羽烟简化为发射-吸收轴对称介质,通过对辐射图像数据进行Able变换得到三维介质内辐射强度分布,利用最小二乘法将反演问题转化为使计算得到的与Abel变换得到的辐射强度误差最小的最优化问题,然后利用共轭梯度法求解该最优化问题.通过在求解正问题得到的准确值的基础上添加随机噪声,模拟辐射图像数据,分析了测量误差对算法反演精度的影响.结果表明:该算法对测量误差不敏感,能够准确的重建羽烟内的辐射源项和吸收系数分布.
Aiming at the characteristics of oxyhydrogen emission parameters of oxyhydrogen rocket engine plume, a method based on a single coupled radiometric image taken by a UV-coupled camera (CCD) was proposed to simultaneously retrieve the UV radiation source term and absorption coefficient of the plume. The method simplifies the plume into the emission-absorption axis symmetric medium, and the radiation intensity distribution in the three-dimensional medium is obtained by performing Able transformation on the radiation image data. The least square method is used to convert the inversion problem into the radiation obtained by the Abel transformation Then the conjugate gradient method is used to solve the optimization problem.Based on the accurate value obtained by solving the positive problem, random noise is added to simulate the radiation image data, and the effect of measurement error on the accuracy of algorithm inversion The results show that the proposed algorithm is insensitive to the measurement error and can accurately reconstruct the radiation source term and absorption coefficient distribution in the feather smoke.