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Applied Optics

Applied Optics


  • Vol. 40, Iss. 15 — May. 20, 2001
  • pp: 2376–2383

Sky-scanning radiometer for absolute measurements of atmospheric long-wave radiation

Rolf Philipona  »View Author Affiliations

Applied Optics, Vol. 40, Issue 15, pp. 2376-2383 (2001)

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Atmospheric long-wave radiation is one of the most promising parameters for observations of climate change that are greenhouse effect related. Long-wave irradiance is usually measured with pyrgeometers that consist of a flat thermopile and a hemispherical dome acting as a filter and protecting the absorbing receiver surface. Pyrgeometers are blackbody calibrated, but uncertainties, mainly related to the silicon hemisphere, arise from thermal effects, inadequate spectral transmission, and cosine-response errors. The new absolute sky-scanning radiometer (ASR) allows absolute measurements of atmospheric long-wave radiation and is suggested as a future reference standard for pyrgeometer field calibration. The calibration of the ASR is based on a reference blackbody source traced to absolute temperature standards. The pyroelectric detector has no window to prevent thermal and spectral transmission effects. Scanning the sky with a narrow viewing angle and integrating with the Gaussian quadrature, rather than taking hemispherical measurements, prevent errors related to the cosine effect.

© 2001 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.1320) Atmospheric and oceanic optics : Atmospheric transmittance
(040.3060) Detectors : Infrared
(350.5610) Other areas of optics : Radiation

Original Manuscript: July 5, 2000
Revised Manuscript: January 2, 2001
Published: May 20, 2001

Rolf Philipona, "Sky-scanning radiometer for absolute measurements of atmospheric long-wave radiation," Appl. Opt. 40, 2376-2383 (2001)

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