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A novel calibration method of focused light field camera for 3-D reconstruction of flame temperature

Sun, Jun, Hossain, Md. Moinul, Xu, Chuan-Long, Zhang, Biao, Wang, Shi-Min (2017) A novel calibration method of focused light field camera for 3-D reconstruction of flame temperature. Optics Communications, 390 . 7 - 15. ISSN 0030-4018. (doi:10.1016/j.optcom.2016.12.056) (KAR id:67210)

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https://doi.org/10.1016/j.optcom.2016.12.056

Abstract

This paper presents a novel geometric calibration method for focused light field camera to trace the rays of flame radiance and to reconstruct the three-dimensional (3-D) temperature distribution of a flame. A calibration model is developed to calculate the corner points and their projections of the focused light field camera. The characteristics of matching main lens and microlens f-numbers are used as an additional constrains for the calibration. Geometric parameters of the focused light field camera are then achieved using Levenberg-Marquardt algorithm. Total focused images in which all the points are in focus, are utilized to validate the proposed calibration method. Calibration results are presented and discussed in details. The maximum mean relative error of the calibration is found less than 0.13, indicating that the proposed method is capable of calibrating the focused light field camera successfully. The parameters obtained by the calibration are then utilized to trace the rays of flame radiance. A least square QR-factorization algorithm with Plank's radiation law is used to reconstruct the 3-D temperature distribution of a flame. Experiments were carried out on an ethylene air fired combustion test rig to reconstruct the temperature distribution of flames. The flame temperature obtained by the proposed method is then compared with that obtained by using high-precision thermocouple. The difference between the two measurements was found no greater than 6.7. Experimental results demonstrated that the proposed calibration method and the applied measurement technique perform well in the reconstruction of the flame temperature.

Item Type: Article
DOI/Identification number: 10.1016/j.optcom.2016.12.056
Uncontrolled keywords: Focused light field camera, Camera calibration, 3-D reconstruction, Flame temperature
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Moinul Hossain
Date Deposited: 05 Jun 2018 23:43 UTC
Last Modified: 16 Feb 2021 13:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/67210 (The current URI for this page, for reference purposes)
Hossain, Md. Moinul: https://orcid.org/0000-0003-4184-2397
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