提出一种基于多光谱辐射测温理论及光学层析技术的三维温度场重建方法。建立了基于参考温度的多光谱测温法数学模型,提出了一种基于模拟退火理论的变松弛因子的光学层析技术新算法,通过计算机数值模拟,详细考察了该算法对非对称温度场分布的重建效果并与传统的代数迭代重建算法及滤波反投影算法进行比较。计算结果表明,变弛豫因子重建算法重建精度最高。作为一个应用实例,用多光谱辐射变弛豫因子重建层析方法重建了四峰蜡烛火焰某一截面的温度分布。

A novel 3 D temperature field reconstruction method is proposed, which is based on multi wavelength thermometry and optical computed tomography. A mathematical model of multi wavelength thermometry is founded, and a novel optical computed tomography based on changeable relaxation parameter technique is proposed. Through computer simulation and comparison with algebraic reconstruction technique and filter back projection algorithm, the reconstruction results of the new method are discussed in detail. The study shows that the new method always gives the best reconstruction results. As an example, temperature distribution of a profile of four peaks candle flame is reconstructed with multi wavelength radiation computed tomography.