Journal article Gas temperature measurement based on contrast reversal in mid-infrared CO 2 images
ORCID SAMURAI ; ORCID SAMURAI ;
Masahiro Saito (author) (Search by this author)
;
Kazuya Kimoto (author) (Search by this author)
;
Yutaro Tsuiki (author) (Search by this author)
; ORCID SAMURAI
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Hideki T. Miyazaki, Takeshi Kasaya, Masahiro Saito, Kazuya Kimoto, Yutaro Tsuiki, Tetsuyuki Ochiai. Gas temperature measurement based on contrast reversal in mid-infrared CO 2 images. Optics Express. 2026, 34 (11), 19701-19724. https://doi.org/10.1364/oe.596786

Description:

(abstract)

We demonstrate noninvasive measurement of gas temperature based on the optical gas imaging. Gas flows containing carbon dioxide (CO2) appear as either bright or dark images, depending on the relative temperatures of the background and the gas, when using a narrowband mid-infrared camera tuned to the CO2 absorption wavelength at 4.3 μm. When the background temperature is varied continuously, the gas image vanishes transiently and then the contrast reverses. The specific background temperature at the point when the gas image disappears provides the gas temperature. This technique is an evolved implementation of the classical line reversal method, made possible by advanced infrared devices. We also apply this technique to two-dimensional temperature mapping and to dynamic emissions from engine exhaust and human breathing.

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  • In Copyright

    © 2026 Optica Publishing Group. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.

Keyword: ガス可視化

Date published: 2026-06-01

Publisher: Optica Publishing Group

Journal:

  • Optics Express (ISSN: 10944087) vol. 34 issue. 11 p. 19701-19724

Funding:

  • National Institute for Materials Science (Sensors and Actuators Research Project)
  • Cabinet Office PRISM
  • Ichimura Foundation of New Technology
  • Steel Foundation for Environmental Protection Technology
  • Japan Society for the Promotion of Science JP22K18990
  • Japan Society for the Promotion of Science JP23K26576
  • Japan Society for the Promotion of Science JP23H01883
  • New Energy and Industrial Technology Development Organization JPNP14004

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1364/oe.596786

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Updated at: 2026-05-20 09:27:28 +0900

Published on MDR: 2026-05-20 10:29:23 +0900

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