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Multispectral coded light for high-speed temperature imaging of aluminum combustion

Andersson, David LU ; Wu, Zhiyong LU orcid ; Berrocal, Edouard LU ; Li, Zhongshan LU and Kristensson, Elias LU (2026) In Optics Express 34(7). p.13393-13404
Abstract

Aluminum is a promising carbon-free energy carrier, but advancing its use requires detailed understanding of its combustion behavior at the single-particle level. Measuring the transient surface temperatures of burning aluminum droplets is particularly challenging due to their small size, extreme temperatures, and fast dynamics. In this work, we demonstrate a multispectral pyrometry approach based on a passive frequency recognition algorithm for multiple exposures (FRAME) to achieve quantitative, time-resolved temperature imaging of aluminum droplet combustion. The method employs a single high-speed monochrome camera combined with spectral multiplexing, enabling simultaneous acquisition of multiple well-defined wavelength bands without... (More)

Aluminum is a promising carbon-free energy carrier, but advancing its use requires detailed understanding of its combustion behavior at the single-particle level. Measuring the transient surface temperatures of burning aluminum droplets is particularly challenging due to their small size, extreme temperatures, and fast dynamics. In this work, we demonstrate a multispectral pyrometry approach based on a passive frequency recognition algorithm for multiple exposures (FRAME) to achieve quantitative, time-resolved temperature imaging of aluminum droplet combustion. The method employs a single high-speed monochrome camera combined with spectral multiplexing, enabling simultaneous acquisition of multiple well-defined wavelength bands without compromising the native capture rate (50 kHz). By applying a multi-wavelength pyrometry analysis to the spectrally encoded images, we obtain spatially resolved temperature maps in the range of 2000-4000 K. The results reveal the ignition, droplet formation, and flame development stages with high temporal fidelity. The demonstrated technique offers an economical and flexible solution for pyrometry under harsh conditions, and provides insights into aluminum combustion dynamics relevant for its future use as a recyclable, carbon-free fuel.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
34
issue
7
pages
12 pages
publisher
Optical Society of America
external identifiers
  • pmid:42071775
  • scopus:105036418992
ISSN
1094-4087
DOI
10.1364/OE.578636
language
English
LU publication?
yes
id
4ca18c43-3362-449a-81ba-fabd0947587a
date added to LUP
2026-04-03 17:05:49
date last changed
2026-09-10 13:34:30
@article{4ca18c43-3362-449a-81ba-fabd0947587a,
  abstract     = {{<p>Aluminum is a promising carbon-free energy carrier, but advancing its use requires detailed understanding of its combustion behavior at the single-particle level. Measuring the transient surface temperatures of burning aluminum droplets is particularly challenging due to their small size, extreme temperatures, and fast dynamics. In this work, we demonstrate a multispectral pyrometry approach based on a passive frequency recognition algorithm for multiple exposures (FRAME) to achieve quantitative, time-resolved temperature imaging of aluminum droplet combustion. The method employs a single high-speed monochrome camera combined with spectral multiplexing, enabling simultaneous acquisition of multiple well-defined wavelength bands without compromising the native capture rate (50 kHz). By applying a multi-wavelength pyrometry analysis to the spectrally encoded images, we obtain spatially resolved temperature maps in the range of 2000-4000 K. The results reveal the ignition, droplet formation, and flame development stages with high temporal fidelity. The demonstrated technique offers an economical and flexible solution for pyrometry under harsh conditions, and provides insights into aluminum combustion dynamics relevant for its future use as a recyclable, carbon-free fuel.</p>}},
  author       = {{Andersson, David and Wu, Zhiyong and Berrocal, Edouard and Li, Zhongshan and Kristensson, Elias}},
  issn         = {{1094-4087}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{7}},
  pages        = {{13393--13404}},
  publisher    = {{Optical Society of America}},
  series       = {{Optics Express}},
  title        = {{Multispectral coded light for high-speed temperature imaging of aluminum combustion}},
  url          = {{http://dx.doi.org/10.1364/OE.578636}},
  doi          = {{10.1364/OE.578636}},
  volume       = {{34}},
  year         = {{2026}},
}