Method for reconstructing flame three-dimensional temperature field of double-light-field camera

Abstract

The invention discloses a method for reconstructing a flame three-dimensional temperature field of a double-light-field camera, and the method comprises the following steps: carrying out the preprocessing of a light field image, and enabling a flame region in the light field image to become a communication region; establishing a cylindrical medium model covering a flame communication area according to the preprocessed light field image; according to the established cylindrical medium model and the preprocessed light field image, carrying out flame three-dimensional contour extraction; and calculating the grids in the three-dimensional contour to finally obtain a three-dimensional temperature field. In the three-dimensional temperature field reconstruction process, only the grids in the flame need to be calculated, the reconstruction resolution of the three-dimensional temperature field is greatly improved, and the calculation time and calculation resources are greatly reduced. The method provided by the invention is high in automation degree, the shot light field image is directly operated, a preset template is not needed, and a technical basis can be provided for measuring the three-dimensional temperature field of the multi-peak complex flame by using a radiation imaging method.

Description

technical field [0001] The invention relates to a method for reconstructing the three-dimensional temperature distribution of a flame with a dual light field camera, and belongs to the technical field of flame temperature measurement. Background technique [0002] Flame combustion temperature is an important indicator closely related to the combustion process. The measurement of the three-dimensional temperature field of the flame is helpful to reveal the nature of the combustion phenomenon and the law of the combustion process. It is of great significance for the control of the generation and emission of combustion pollutants, the design and optimal operation of the combustion system. The non-contact measurement technology of flame temperature field based on radiation imaging uses the radiation image of the flame itself to obtain the temperature information of the flame. It has the advantages of non-invasive, high measurement accuracy, continuous real-time measurement and t...

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Problems solved by technology

[0005]However, an important factor restricting the development of flame 3D temperature field measurement technology with dual light field cameras is that the division method of flame 3D mesh cannot fully adapt to different flame 3D profiles , which leads to the fact that the flame-free medium area also participates in the calculation of flame radiation transfer, which increases the ill-posedness of the reconstruction problem of the flame 3D temperature field, which makes the reconstruction calculation time longer and the spatial resolution of the reconstructed 3D temperature field of the flame is low. In terms of 3D contour extraction, further in-depth research is needed

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