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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 33, Iss. 7 — Mar. 1, 1994
  • pp: 1270–1273

Calorimetric support of directional–hemispherical reflection measurements in the infrared spectral range

Wolfgang Richter, Stefan M. Sarge, and Frank Kämmer  »View Author Affiliations


Applied Optics, Vol. 33, Issue 7, pp. 1270-1273 (1994)
http://dx.doi.org/10.1364/AO.33.001270


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Abstract

Measurements of the directional–hemispherical reflectance ρ with the Physikalisch-Technische Bundesanstalt IR sphere reflectometer have been confirmed by calorimetric determination of the absorptance α in the same geometrical conditions (irradiation at 10°, hemispherical reflection). The good agreement of ρ with (1 − α) on both highly reflecting and low-reflecting surfaces indicates that in the mid-IR spectral range the integrating sphere reflectometer is capable of essentially correct reflectance measurements of diffusely reflecting surfaces, with an estimated uncertainty of 0.01 after correction for a small systematic deviation. This capability opens up the possibility of developing IR reflectance standards.

© 1994 Optical Society of America

History
Original Manuscript: March 10, 1993
Revised Manuscript: July 21, 1993
Published: March 1, 1994

Citation
Wolfgang Richter, Stefan M. Sarge, and Frank Kämmer, "Calorimetric support of directional–hemispherical reflection measurements in the infrared spectral range," Appl. Opt. 33, 1270-1273 (1994)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-33-7-1270

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