| Citation: | LIU Yudong, XU Chuanlong, SUN Jun, et al. Characterization of ray sampling for flame radiation in light field imaging[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(11): 2207-2215. doi: 10.13700/j.bh.1001-5965.2017.0067(in Chinese)
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To investigate the radiation sampling of the translucent media and optimize the parameters of a plenoptic camera, a backward ray tracing model is established based on the paraxial approximation in this paper. Considering the integrating properties along the sampling path of the translucent media, several indices for evaluating the angular sampling are then proposed such as cone angle of a single pixel and sampling angel of object side. The effects of the positions of the pixels and micro lenses of the plenoptic camera on the radiation sampling and the effects of the optical parameters of the plenoptic camera on ray direction sampling performance are analyzed. The results indicate that, for the light field sampling on flame radiation, a smaller diameter of the micro lens is useful for improving the accuracy of radiation sampling in certain direction and decreasing the size of main lens aperture. Moreover, smaller focal length of main lens is advantageous for improving the sampling angle of object side.
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