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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 18 — Sep. 4, 2006
  • pp: 8121–8126

Correct consideration of the index of refraction using blackbody radiation

Jürgen Hartmann  »View Author Affiliations

Optics Express, Vol. 14, Issue 18, pp. 8121-8126 (2006)

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The correct consideration of the index of refraction when using blackbody radiators as standard sources for optical radiation is derived and discussed. It is shown that simply using the index of refraction of air at laboratory conditions is not sufficient. A combination of the index of refraction of the media used inside the blackbody radiator and for the optical path between blackbody and detector has to be used instead. A worst case approximation for the introduced error when neglecting these effects is presented, showing that the error is below 0.1 % for wavelengths above 200 nm. Nevertheless, for the determination of the spectral radiance for the purpose of radiation temperature measurements the correct consideration of the refractive index is mandatory. The worst case estimation reveals that the introduced error in temperature at a blackbody temperature of 3000 °C can be as high as 400 mk at a wavelength of 650 nm and even higher at longer wavelengths.

© 2006 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.5240) Instrumentation, measurement, and metrology : Photometry
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.6780) Instrumentation, measurement, and metrology : Temperature
(350.4800) Other areas of optics : Optical standards and testing
(350.5610) Other areas of optics : Radiation

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: July 3, 2006
Revised Manuscript: August 9, 2006
Manuscript Accepted: August 12, 2006
Published: September 1, 2006

Jurgen Hartmann, "Correct consideration of the index of refraction using blackbody radiation," Opt. Express 14, 8121-8126 (2006)

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