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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 11 — Apr. 10, 2014
  • pp: 2507–2514

Effective emissivity of a blackbody cavity formed by two coaxial tubes

Guohui Mei, Jiu Zhang, Shumao Zhao, and Zhi Xie  »View Author Affiliations

Applied Optics, Vol. 53, Issue 11, pp. 2507-2514 (2014)

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A blackbody cavity is developed for continuously measuring the temperature of molten steel, which consists of a cylindrical outer tube with a flat bottom, a coaxial inner tube, and an aperture diaphragm. The ray-tracing approach based on the Monte Carlo method was applied to calculate the effective emissivity for the isothermal cavity with the diffuse walls. And the dependences of the effective emissivity on the inner tube relative length were calculated for various inner tube radii, outer tube lengths, and wall emissivities. Results indicate that the effective emissivity usually has a maximum corresponding to the inner tube relative length, which can be explained by the impact of the inner tube relative length on the probability of the rays absorbed after two reflections. Thus, these results are helpful to the optimal design of the blackbody cavity.

© 2014 Optical Society of America

OCIS Codes
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.6780) Instrumentation, measurement, and metrology : Temperature
(130.6010) Integrated optics : Sensors
(230.6080) Optical devices : Sources

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: January 21, 2014
Revised Manuscript: February 25, 2014
Manuscript Accepted: March 12, 2014
Published: April 10, 2014

Guohui Mei, Jiu Zhang, Shumao Zhao, and Zhi Xie, "Effective emissivity of a blackbody cavity formed by two coaxial tubes," Appl. Opt. 53, 2507-2514 (2014)

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