Abstract
Compared with conventional camera, the light field camera takes the advantage of being capable of recording the direction and intensity information of each ray projected onto the CCD (charge couple device) sensor simultaneously. In this paper, a novel method is proposed for reconstructing three-dimensional (3-D) temperature field of a flame based on a single light field camera. A radiative imaging of a single light field camera is also modeled for the flame. In this model, the principal ray represents the beam projected onto the pixel of the CCD sensor. The radiation direction of the ray from the flame outside the camera is obtained according to thin lens equation based on geometrical optics. The intensities of the principal rays recorded by the pixels on the CCD sensor are mathematically modeled based on radiative transfer equation. The temperature distribution of the flame is then reconstructed by solving the mathematical model through the use of least square QR-factorization algorithm (LSQR). The numerical simulations and experiments are carried out to investigate the validity of the proposed method. The results presented in this study show that the proposed method is capable of reconstructing the 3-D temperature field of a flame.
Highlights
Combustion and flame widely exists in various industrial processes such as the boiler of coal-fired power plant and the blast furnace of steel plant
The flame temperature has a direct influence on flame properties such as flame height and width, species and soot concentrations, and it is the one of the most important characteristic parameter of the flame closely linked to the performance of the combustion apparatus
This paper aims to present a novel method for reconstructing 3-D temperature field of a flame based on a single focused light field camera
Summary
Combustion and flame widely exists in various industrial processes such as the boiler of coal-fired power plant and the blast furnace of steel plant. Flame is caused by the combustion reaction of the fuel with the participation of oxygen, and it is the visible part of the radiation emitted from reaction products including the hot gaseous and particulates during combustion [1]. The combustion apparatuses in industries are continuously facing new challenges in order to increase the combustion efficiency, reliability and flexibility, and to reduce their environmental impact [2]. A flame is generally a 3-D flow field which is the reaction zone of a combustion process. It is desirable to determine the 3-D temperature field of flame for in-depth understanding of the combustion mechanism, and subsequent optimization of combustion process and pollutant formation process
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