各向异性介质二维微阵列成像机理及四维光辐射信息重构

The flame temperature distribution is an important factor to evaluate the performance and operating status of large combustion equipments, while the light field radiation informationof the flame is a key parameter to acquire the large flame temperature distribution. So it is significant to develop anoptical field radiation information reconstruction algorithm for the large flame. In this study, we will develop a radiative transfer model for 3D complex anisotropic participating medium using the abundance spectral radiation information of the flame itself. Then, we investigate the imaging models and algorithms based on the 3D light field information photographed by the micro-array camera and we also investigate the imaging theories with their corresponding algorithms at different imaging conditions. Combined with the rebuilding light field information, we will retrieve the temperature field in real time, andfinally obtain the medium temperature and radiative characteristics parameters field of the 3D large flame. This study is profound for the full investigation of the large flame reaction rate, 3D structure，components，overall characteristics of largr flame, and for building and verifying a new, accurate combustion model. The content of this study is aboutthe radiation heat transfer, Fourier optics, combustion and radiation inverse problem, which belongs to the cross disciplinary knowledge. It is very significant for the development of the crossd is ciplinary and related engineering field.

燃烧火焰温度分布是用于考量大型燃烧设备工作状态及性能的重要指标之一，而火焰的光场辐射信息是获得喷焰温度场的关键因素。建立适用于大型火焰的光场辐射信息重建算法便具有十分重要的意义。本课题拟充分利用火焰自身发射的丰富的光谱辐射信息，建立适用于三维复杂各向异性参与性介质内的辐射传输模型；由微阵列相机拍摄获得的三维光场信息出发，研究相机成像环节的模型及算法，对不同条件下相机成像的所需不同算法所对应的成像机理展开研究；结合重建后的光场信息，对喷焰温度场进行实时反演，并最终获得三维火焰介质的温度、辐射特性参数场信息。本课题所研究工作对全面研究大型火焰的反应速度、三维结构、组分的生成、整体特性以及对于新的、准确的燃烧模型的建立和验证等均具有相当意义。本课题研究涉及到辐射换热、傅里叶光学、燃烧学、辐射反问题等多方面研究内容，属于多学科知识交叉研究，对促进多学科发展及相关工程领域具有重要意义。

本项目发展了一种基于光线分裂技术的蒙特卡洛算法，建立了基于蒙特卡洛方法的三维火焰光场成像物理仿真平台，优化了含有三种微透镜的六边形微透镜阵列结构，模拟了Raytrix相机拍摄的非均匀温度场的火焰光场成像；通过分析不同辐射特性条件下的火焰子孔径图像，厘清了基于光场相机的高温发光火焰成像机制，得到了火焰辐射特性对光场成像的影响机理；明晰了火焰光场成像的不确定度传递过程。研究成果为获得对火焰光场成像技术创新发展有导引与基础支撑作用的科学认知积累，为推动火焰成像技术的创新发展提供基础理论和技术支持。申请人以第一/通讯作者身份发表SCI检索论文19篇，申请发明专利2项。