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Volumetric spectral imaging and two-color pyrometry of flames using plenoptic cameras
Author(s): Jacob George; Christopher Clifford; Thomas Jenkins; Brian Thurow
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Paper Abstract

This paper presents a methodology to obtain three-dimensionally (3D) resolved measurements of temperature, soot volume fraction, and excited state radical concentration in a volume of luminous combustion gases using light field imaging with a plenoptic camera. The technique involves measurement of emission intensities at multiple wavelength bands selected to enable two-color pyrometry of soot particles and chemiluminescence of CH* and C2* radicals. The feasibility of this method was tested using laboratory flames and reconstruction algorithms that were developed previously for 3D imaging of discrete particles. The results show that the existing algorithms reproduce the basic structural features of the flame but with limited spatial resolution, demonstrating feasibility but also revealing the need for improved algorithms for volumetric reconstruction. Quantitative measurements of temperature and soot volume fraction were obtained that were in good agreement with independent measurements using conventional techniques and distributions of CH* and C2* were obtained that were consistent with expected trends.

Paper Details

Date Published: 3 September 2019
PDF: 18 pages
Proc. SPIE 11102, Applied Optical Metrology III, 1110216 (3 September 2019); doi: 10.1117/12.2529510
Show Author Affiliations
Jacob George, MetroLaser, Inc. (United States)
Christopher Clifford, Auburn Univ. (United States)
Thomas Jenkins, MetroLaser, Inc. (United States)
Brian Thurow, Auburn Univ. (United States)


Published in SPIE Proceedings Vol. 11102:
Applied Optical Metrology III
Erik Novak; James D. Trolinger, Editor(s)

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