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

Jun Sun, Md Moinul Hossain, Chuan Long Xu, Biao Zhang, Shi Min Wang

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

LanguageEnglish
Pages7-15
Number of pages9
JournalOptics Communications
Volume390
Early online date1 Jan 2017
DOIs
Publication statusPublished - 1 May 2017
Externally publishedYes

Fingerprint

flame temperature
flames
Cameras
cameras
Calibration
temperature distribution
radiance
rays
Temperature
radiation laws
Temperature distribution
calibrating
thermocouples
factorization
ethylene
projection
lenses
Thermocouples
Factorization
air

Keywords

  • 3-D reconstruction
  • camera calibration
  • flame temperature
  • focused light field camera
  • geometric calibration
  • flame radiance

Cite this

Sun, Jun ; Hossain, Md Moinul ; Xu, Chuan Long ; Zhang, Biao ; Wang, Shi Min. / A novel calibration method of focused light field camera for 3-D reconstruction of flame temperature. In: Optics Communications. 2017 ; Vol. 390. pp. 7-15.
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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.",
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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.

In: Optics Communications, Vol. 390, 01.05.2017, p. 7-15.

Research output: Contribution to journalArticle

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