摘要
提出一种多相机共光路层析成像方法,对火焰的时空演化特性进行表征。首先,在成像光路结构中利用级联分光棱镜将光能量分配到不同探测通道,在同步控制器驱动下,成像系统能够对瞬态火焰的不同断面同时进行聚焦。其次,建立光学层析系统的空间物像映射关系,基于反卷积算法实现火焰不同断面位置处自发辐射特性的数值解析。实验结果表明,不同相机能够同步独立地获取火焰辐射信息,可实现对动态火焰的高空间分辨率测试。
Objective The reconstruction of a three-dimensional flame structure mainly includes multi-view measurement and unidirectional optical path measurement methods.As for the former,the number of cameras needs to be increased for the spatial resolution improvement of test results.However,it is not suitable for reconstructing a three-dimensional flame field in a burner due to the constraint of limited test space,which refers to the light occlusion by the burner wall.On the contrary,the latter is immune to testable space limitations and has remarkable advantages in diagnosing a three-dimensional flame structure by means of tomography based on light field imaging.Traditional light field imaging is achieved with the aid of a liquid zoom lens or a micro-lens array,which can reconstruct the three-dimensional field by refocusing different objects from one projection.The focused surface of the liquid lens can be changed easily by adjusting the voltage,which is helpful to get refocused images.But the temporal resolution of this operation is so insufficient that it is not applicable to highly dynamic flames.The position and direction information of a three-dimensional flame field can also be reconstructed by acquiring refocused images with a micro-lens array.However,the existing light field imaging method based on a micro-lens array processes images by data calculation,which leads to the compatible problem of temporal and spatial resolution.Therefore,it is not applicable to a highly dynamic flame environment with temporal-spatial heterogeneity.It is necessary to establish a three-dimensional reconstruction method with high temporal and spatial resolution for dynamic flame.Methods In this paper,the multi-camera common-optical-path imaging method is proposed to characterize the temporal and spatial resolution characteristics of flame by tomography.In the optical imaging path structure,cascaded optical splitters are used to allocate light energy to different detection channels,and cameras are placed at each detection channel for l
作者
卫娜瑛
管今哥
郑永秋
张成飞
刘喆
岳博坤
薛晨阳
Wei Naying;Guan Jinge;Zheng Yongqiu;Zhang Chengfei;Liu Zhe;Yue Bokun;Xue Chenyang(State Key Laboratory of Dynamic Measurement Technology,North University of China,Taiyuan 030051,Shanxi,China;The 601 Institute of the Sixth Academy of China Aerospace Science and Industry Corporation,Hohhot 010010,Inner Mongolia,China;College of Electronics Engineering and Computer Science,Peking University,Beijing 100084,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第9期85-96,共12页
Acta Optica Sinica
基金
国家自然科学基金(62005251)
中央引导地方科技发展资金(YDZJSX2022A031)
国防基础科研计划(2020204B037)。
关键词
成像系统
层析重构
分光探测
物像映射
动态火焰
高时空分辨率
imaging system
tomographic reconstruction
beam-splitting detection
object and image mapping
dynamic flame
high spatial and temporal resolution
