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Applied Optics

Applied Optics


  • Vol. 39, Iss. 24 — Aug. 20, 2000
  • pp: 4278–4283

Transient infrared temperature measurements of liquid-fuel surfaces: results of studies of flames spread over liquids

Tadashi Konishi, Akihiko Ito, and Kozo Saito  »View Author Affiliations

Applied Optics, Vol. 39, Issue 24, pp. 4278-4283 (2000)

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An infrared thermograph technique with an 8–12-µm spectral range was used to measure transient two-dimensional profiles of liquid (1-propanol) surface temperatures. An IR camera was placed over the liquid, allowing us to observe the fuel surface through propanol vapor. To use this technique, one must know the emissivity of the liquid surface and the IR absorption of both the liquid propanol and the propanol vapor. The emissivity of the liquid propanol was determined with a fine thermocouple temperature measurement, IR absorption with the propanol vapor was calibrated with a blackbody source, and IR absorption with a liquid propanol was theoretically estimated. The accuracy of our infrared thermograph technique proved to be better than 97% in detecting the liquid-surface temperature with a temperature sensitivity of 0.1 °C and a time response of 30 ms.

© 2000 Optical Society of America

OCIS Codes
(110.3080) Imaging systems : Infrared imaging
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.6780) Instrumentation, measurement, and metrology : Temperature

Original Manuscript: July 27, 1999
Revised Manuscript: March 2, 2000
Published: August 20, 2000

Tadashi Konishi, Akihiko Ito, and Kozo Saito, "Transient infrared temperature measurements of liquid-fuel surfaces: results of studies of flames spread over liquids," Appl. Opt. 39, 4278-4283 (2000)

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