Tri-zone flame spatial structure imaging combined with endogenic polarized scattering

Liyuan Huang; Biwang Liu; Zhekai Lin; Junping Zhong; Dingan Han; Wenzheng Ding; Wenzheng Ding; Yaguang Zeng

doi:10.1364/OL.469836

Optics Letters
Vol. 47,
Issue 22,
pp. 5837-5840
(2022)
•https://doi.org/10.1364/OL.469836

Tri-zone flame spatial structure imaging combined with endogenic polarized scattering

Liyuan Huang, Biwang Liu, Zhekai Lin, Junping Zhong, Dingan Han, Wenzheng Ding, and Yaguang Zeng

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Liyuan Huang, Biwang Liu, Zhekai Lin, Junping Zhong, Dingan Han, Wenzheng Ding, and Yaguang Zeng, "Tri-zone flame spatial structure imaging combined with endogenic polarized scattering," Opt. Lett. 47, 5837-5840 (2022)

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Abstract

We propose a multi-mode optical imaging method to retrieve the 2D and 3D spatial structures of the preheating, reaction, and recombination zones of an axisymmetric steady flame. In the proposed method, an infrared camera, a visible light monochromatic camera, and a polarization camera are triggered synchronously to capture 2D flame images, and their corresponding 3D images are reconstructed by combining different projection position images. The results of the experiments conducted indicate that the infrared and visible light images represent the flame preheating and flame reaction zones, respectively. The polarized image can be obtained by computing the degree of linear polarization (DOLP) of raw images captured by the polarization camera. We discover that the highlighted regions in the DOLP images lie outside the infrared and visible light zones; they are insensitive to the flame reaction and have different spatial structures for different fuels. We deduce that the combustion product particles cause endogenic polarized scattering, and that the DOLP images represent the flame recombination zone. This study focuses on the combustion mechanisms, such as the formation of combustion products and quantitative flame composition and structure.

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Corrections

29 November 2022: A typographical correction was made to the author affiliations.

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Supplementary Material (6)

Name	Description
Supplement 1	Revised supplemental document
Visualization 1	The polarized light intensity and DOLP of the alcohol flame is shown in this visualization, from which we can clearly observe that the structural differences of the fringes remain relatively stable during the combustion process.
Visualization 2	The polarized light intensity and DOLP of the kerosene flame is shown in this visualization, from which we can clearly observe that the structural differences of the fringes remain relatively stable during the combustion process.
Visualization 3	Flame structure from infrared camera. The cut in the 3D reconstruction demonstrate the interior of the flame structure.
Visualization 4	Flame structure from visible-light camera. The cut in the 3D reconstruction demonstrate the interior of the flame structure.
Visualization 5	Flame structure from degree of linear polarization. The cut in the 3D reconstruction demonstrate the interior of the flame structure.

Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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