Investigation of flame radiation sampling and temperature measurement through light field camera

Jun Sun, Md. Moinul Hossain, Chuanlong Xu, Biao Zhang, Yudong Liu, Shimin Wang

Research output: Contribution to journalArticle

Abstract

Different light field cameras (traditional and focused) are considered for the flame temperature measurement in recent years. But it is crucial to investigate which light field camera can provide better reconstruction accuracy for the flame temperature. In this study, numerical simulations were carried out to investigate the reconstruction accuracy of the flame temperature for the different light field cameras. The effects of flame radiation sampling of the light field cameras were described and evaluated. A novel concept of sampling region and sampling angle of the light field camera was proposed to assess the directional accuracy of the sampled rays of each pixel on the photosensor. It has been observed that the traditional light field camera sampled more rays for each pixel, hence the sampled rays of each pixel are approached less accurately from a single direction. The representative sampled ray was defined to obtain the direction of flame radiation. The radiation intensity of each pixel was calculated and indicated that the traditional light field camera sampled less radiation information than the focused light field camera. A non-negative least square (NNLS) algorithm was used to reconstruct the flame temperature. The reconstruction accuracy was also evaluated for the different distances from microlens array (MLA) to the photosensor. The results obtained from the simulations suggested that the focused light field camera performed better in comparison to the traditional light field camera. Experiments were also carried out to reconstruct the temperature distribution of ethylene diffusion flames based on the light field imaging, and to validate the proposed model.
LanguageEnglish
JournalInternational Journal of Heat and Mass Transfer
Publication statusAccepted/In press - 18 Jan 2018

Fingerprint

Temperature measurement
temperature measurement
flames
Cameras
sampling
cameras
Sampling
Radiation
radiation
flame temperature
rays
Pixels
pixels
photosensors
diffusion flames
Temperature
radiant flux density
Ethylene
Temperature distribution
temperature distribution

Keywords

  • focused light field camera
  • traditional light field camera
  • radiation sampling
  • 3-D reconstruction
  • flame temperature

Cite this

Sun, Jun ; Hossain, Md. Moinul ; Xu, Chuanlong ; Zhang, Biao ; Liu, Yudong ; Wang, Shimin. / Investigation of flame radiation sampling and temperature measurement through light field camera. In: International Journal of Heat and Mass Transfer. 2018.
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title = "Investigation of flame radiation sampling and temperature measurement through light field camera",
abstract = "Different light field cameras (traditional and focused) are considered for the flame temperature measurement in recent years. But it is crucial to investigate which light field camera can provide better reconstruction accuracy for the flame temperature. In this study, numerical simulations were carried out to investigate the reconstruction accuracy of the flame temperature for the different light field cameras. The effects of flame radiation sampling of the light field cameras were described and evaluated. A novel concept of sampling region and sampling angle of the light field camera was proposed to assess the directional accuracy of the sampled rays of each pixel on the photosensor. It has been observed that the traditional light field camera sampled more rays for each pixel, hence the sampled rays of each pixel are approached less accurately from a single direction. The representative sampled ray was defined to obtain the direction of flame radiation. The radiation intensity of each pixel was calculated and indicated that the traditional light field camera sampled less radiation information than the focused light field camera. A non-negative least square (NNLS) algorithm was used to reconstruct the flame temperature. The reconstruction accuracy was also evaluated for the different distances from microlens array (MLA) to the photosensor. The results obtained from the simulations suggested that the focused light field camera performed better in comparison to the traditional light field camera. Experiments were also carried out to reconstruct the temperature distribution of ethylene diffusion flames based on the light field imaging, and to validate the proposed model.",
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Investigation of flame radiation sampling and temperature measurement through light field camera. / Sun, Jun; Hossain, Md. Moinul; Xu, Chuanlong; Zhang, Biao; Liu, Yudong; Wang, Shimin.

In: International Journal of Heat and Mass Transfer, 18.01.2018.

Research output: Contribution to journalArticle

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N2 - Different light field cameras (traditional and focused) are considered for the flame temperature measurement in recent years. But it is crucial to investigate which light field camera can provide better reconstruction accuracy for the flame temperature. In this study, numerical simulations were carried out to investigate the reconstruction accuracy of the flame temperature for the different light field cameras. The effects of flame radiation sampling of the light field cameras were described and evaluated. A novel concept of sampling region and sampling angle of the light field camera was proposed to assess the directional accuracy of the sampled rays of each pixel on the photosensor. It has been observed that the traditional light field camera sampled more rays for each pixel, hence the sampled rays of each pixel are approached less accurately from a single direction. The representative sampled ray was defined to obtain the direction of flame radiation. The radiation intensity of each pixel was calculated and indicated that the traditional light field camera sampled less radiation information than the focused light field camera. A non-negative least square (NNLS) algorithm was used to reconstruct the flame temperature. The reconstruction accuracy was also evaluated for the different distances from microlens array (MLA) to the photosensor. The results obtained from the simulations suggested that the focused light field camera performed better in comparison to the traditional light field camera. Experiments were also carried out to reconstruct the temperature distribution of ethylene diffusion flames based on the light field imaging, and to validate the proposed model.

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