Abstract
The plenoptic imaging technique provides a promising approach to the non-invasive three-dimensional measurement, especially for the high-temperature combustion diagnosis. We establish a light-field convolution imaging model for diffusion flame in this work, considering the radiation transfer process inside the diffusion flame and the light transfer process inside the focused plenoptic camera together. The radiation transfer process is described by the radiation transfer equation and solved by the generalized source multi-flux method. Wave optics theory is adopted to describe the light transfer process, combining Fresnel diffraction and the phase conversion of the lens. The flame light-field image is obtained by the light-field convolution imaging model and adopted as the measurement signal to reconstruct three-dimensional temperature field. The inverse problem of temperature reconstruction is solved by the least square QR decomposition method. The simulative temperature reconstruction work is conducted, including the inverse analysis, the uncertainty analysis, and the measurement noise influence. All the results show that the proposed measurement method is available to reconstruct three-dimensional temperature with satisfactory accuracy and acceptable uncertainty. Both symmetric and asymmetric distributed temperature fields are investigated, and the reconstructed results prove the validity and universality of the measurement method.
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This work was supported by the National Natural Science Foundation of China (Grant No. 51976044), the National Science and Technology Major Project (Grant No. 2017-V-0016-0069), and the Foundation for Heilongjiang Touyan Innovation Team Program.
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Shi, J., Qi, H., Yu, Z. et al. Three-dimensional temperature reconstruction of diffusion flame from the light-field convolution imaging by the focused plenoptic camera. Sci. China Technol. Sci. 65, 302–323 (2022). https://doi.org/10.1007/s11431-020-1761-2
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DOI: https://doi.org/10.1007/s11431-020-1761-2