Volumetric spectral imaging and two-color pyrometry of flames using plenoptic cameras

Jacob George; Christopher Clifford; Thomas Jenkins; Brian Thurow

doi:10.1117/12.2529510

3 September 2019 Volumetric spectral imaging and two-color pyrometry of flames using plenoptic cameras

Jacob George, Christopher Clifford, Thomas Jenkins, Brian Thurow

Proceedings Volume 11102, Applied Optical Metrology III; 1110216 (2019) https://doi.org/10.1117/12.2529510
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

Jacob George, Christopher Clifford, Thomas Jenkins, and Brian Thurow "Volumetric spectral imaging and two-color pyrometry of flames using plenoptic cameras", Proc. SPIE 11102, Applied Optical Metrology III, 1110216 (3 September 2019); https://doi.org/10.1117/12.2529510

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