Investigation and optimization of sampling characteristics of light field camera for flame temperature measurement

doi:10.1088/1674-1056/28/3/034207

Abstract

It is essential to investigate the light field camera parameters for the accurate flame temperature measurement because the sampling characteristics of the flame radiation can be varied with them. In this study, novel indices of the light field camera were proposed to investigate the directional and spatial sampling characteristics of the flame radiation. Effects of light field camera parameters such as focal length and magnification of the main lens, focal length and magnification of the microlens were investigated. It was observed that the sampling characteristics of the flame are varied with the different parameters of the light field camera. The optimized parameters of the light field camera were then proposed for the flame radiation sampling. The larger sampling angle (23 times larger) is achieved by the optimized parameters compared to the commercial light field camera parameters. A non-negative least square (NNLS) algorithm was used to reconstruct the flame temperature. The reconstruction accuracy was also evaluated by the optimized parameters. The results suggested that the optimized parameters can provide higher reconstruction accuracy for axisymmetric and non-symmetric flame conditions in comparison to the commercial light field camera.

Keywords: light field camera flame radiation sampling parameter optimization temperature reconstruction

Received: 16 September 2018
Revised: 31 December 2018
Accepted manuscript online:

PACS:	42.15.-i	(Geometrical optics)
	44.40.+a	(Thermal radiation)
	42.30.Wb	(Image reconstruction; tomography)
	07.60.Dq	(Photometers, radiometers, and colorimeters)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 51676044 and 51327803), the Social Development Project of Jiangsu Province, China (Grant No. BE20187053), the Postgraduate Research and Practice Innovation Program of Jiangsu Province, China (Grant No. KYCX170081), and China Scholarship Council.

Corresponding Authors: Chuanlong Xu
E-mail: chuanlongxu@seu.edu.cn

Cite this article:

Yudong Liu(刘煜东), Md. Moinul Hossain, Jun Sun(孙俊), Biao Zhang(张彪), Chuanlong Xu(许传龙) Investigation and optimization of sampling characteristics of light field camera for flame temperature measurement 2019 Chin. Phys. B 28 034207

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Investigation and optimization of sampling characteristics of light field camera for flame temperature measurement

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