中文摘要：

为了实现瞬态火焰的三维温度场的测量,提出了一种基于光场分层成像技术的火焰温度场测量方法.利用光场相机通过一次曝光,将各个聚焦平面的信息储存在一张原始光场图像上,通过光场重聚焦技术获得了不同聚焦面的火焰图像序列,结合图像反演算法得到了高精度、实时性的火焰各断层图像,进而实现三维温度场分布的重建.建立了基于光场分层成像技术的火焰温度测量系统,实现对火焰三维空间上4个断层面的温度场重建.结果表明,重建的第1,4层的火焰面积较小,低温区域位置较低,第2,3层的火焰面积较大,低温区域位置较高;每层的火焰分布都是中部边缘处温度最高,且各层的火焰分布之间有明显差别.火焰重建实验结果符合燃烧火焰的外形结构和内部的温度分布结构,证明了此方法的可行性.

英文摘要：

A light field optical section tomographic technique was proposed to measure the transient3 D flame temperature field. The information of each focal plane of the flame was simultaneously recorded on a light field image by a single exposure of a light field camera. Then,the flame image sequences of different focal planes were derived by the optical field refocusing technique. Combined with the image inversion algorithm,the high-precision,real-time images of each flame section were acquired,and then the three-dimensional temperature field distribution reconstruction was achieved.The measurement system and reconstruction results of 4 sections of the flame in 3D space were presented. The results showthat the image areas of the first and the fourth sections are smaller and the lowtemperature region is lower; the image areas of the second and the third sections are larger,and the lowtemperature region is higher; the temperature of the middle edge of each section is the highest,and there is a significant difference between the temperature distributions of each section. The reconstructed results are in agreement with the temperature distribution and the contour structure of the combustion flame.