【摘要】 研究少投影数情况下等离子体温度场重建问题。结合光学层析重建算法及等离子体光谱诊断中的谱线绝对强度法进行自由电弧等离子体温度场重建实验。理论上 ,详细讨论了一种基于最大熵准则及最优化原理的光学层析图像重建新算法。通过计算机数值模拟 ,考察了该算法对非对称温度场分布的重建效果。详细分析了投影噪声、投影方向数、场分布性质对重建精度的影响 ,并与代数迭代重建算法结果进行对比 .结果表明 ,该算法以两个正交方向投影数据重建单峰余弦模拟场平均误差仅为 0 .0 3 % ,而代数迭代重建算法为 3 .81% ;该算法以四个均匀角度间隔投影数据重建三峰随机高斯模拟场平均误差为 1.77% ,而代数迭代重建算法为 2 .0 2 %。实验中 ,运用该算法结合谱线绝对强度法重建了自由电弧等离子体的温度分布更多还原

【Abstract】 The reconstruction problem of temperature field of plasma with limited-view data is studied. The reconstruction experiment of the arc plasma tempreture is fulfilled combining the optical computed tomography with the absolute spectral intensity method in the plasma diagnosis. An optical computed tomography algorithm based on maximum entropy and optimization is discussed in detail theoretically. Its reconstruction results for asymmetrical temperature field with the simulation computation are studied. The effects of noise, view numbers and distribution are analyzed and this algorithm is compared with ART algorithm. The results show the average error of the new algorithm is 0.03% and that of ART is 1.77% with the data of two orthogonal views.The average error of the new algorithm is 1.77% and that of ART is 2.02% with the data of four space evenly views. As a measurement sample, an arc temperature field with spectrum method is reconstructed.更多还原