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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 24 — Aug. 20, 2008
  • pp: 4441–4447

Operation and investigation of a tilted bottom cavity for pyrgeometer characterizations

Julian Gröbner  »View Author Affiliations

Applied Optics, Vol. 47, Issue 24, pp. 4441-4447 (2008)

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A new cavity for pyrgeometer characterizations has been built at the Infrared Radiometry Section of the World Radiation Center (WRC-IRS) at PMOD/WRC. The calculated effective emissivity of 0.99993 ± 0.00033 was obtained from Monte Carlo simulations taking into account the geometry and the measured temperature distributions of the cavity. The cavity is operated in a temperature range of 30 ° C to + 30 ° C and is initially flushed with nitrogen to reduce the relative humidity in the cavity. The estimated uncertainties of retrieved pyrgeometer parameters k 1 , k 2 , and k 3 are ± 0.024 , ± 0.0008 , and ± 0.03 , respectively. The relative uncertainty of pyrgeometer sensitivity C is 0.8%. The comparison with the cavity used since 1995 at PMOD/WRC gave average differences of 0.005, 0.00026, and 0.08 for k 1 , k 2 , and k 3 , respectively. The pyrgeometer sensitivity retrieved with the new cavity is on average 1.0% higher than with the original cavity.

© 2008 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(040.3060) Detectors : Infrared
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.6810) Instrumentation, measurement, and metrology : Thermal effects

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: March 19, 2008
Revised Manuscript: June 12, 2008
Manuscript Accepted: June 20, 2008
Published: August 19, 2008

Julian Gröbner, "Operation and investigation of a tilted bottom cavity for pyrgeometer characterizations," Appl. Opt. 47, 4441-4447 (2008)

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