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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 10 — Apr. 1, 2008
  • pp: 1594–1607

Charge-coupled device spectrograph for direct solar irradiance and sky radiance measurements

Natalia Kouremeti, Alkiviadis Bais, Stelios Kazadzis, Mario Blumthaler, and Rainer Schmitt  »View Author Affiliations


Applied Optics, Vol. 47, Issue 10, pp. 1594-1607 (2008)
http://dx.doi.org/10.1364/AO.47.001594


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Abstract

The characterization of a charged-coupled device (CCD) spectrograph developed at the Laboratory of Atmospheric Physics, Thessaloniki is presented. The absolute sensitivity of the instrument for direct irradiance and sky radiance measurements was determined, respectively, with an uncertainty of 4.4% and 6.6% in the UV-B, and 3% and 6% in the UV-A, visible and near-infrared (NIR) wavelength ranges. The overall uncertainty associated with the direct irradiance and the sky radiance measurements is, respectively, of the order of 5% and 7% in the UV-B, increasing to 10% for low signals [e.g., at solar zenith angles (SZAs) larger than 70 ° ], and 4% and 6% in the UV-A, visible, and NIR. Direct solar spectral irradiance measurements from an independently calibrated spectroradiometer (Bentham DTM 300) were compared with the corresponding CCD measurements. Their agreement in the wavelength range of 310 500 nm is within 0.5 % ± 1.1 % (for SZA between 20 ° and 70 ° ). Aerosol optical depth (AOD) derived by the two instruments using direct Sun spectra and by a collocated Cimel sunphotometer [Aerosol Robotic network (AERONET)] agree to within 0.02 ± 0.02 in the range of 315 870 nm . Significant correlation coefficients with a maximum of 0.99 in the range of 340 360 nm and a minimum of 0.90 at 870 nm were found between synchronous AOD measurements with the Bentham and the Cimel instruments.

© 2008 Optical Society of America

OCIS Codes
(010.1100) Atmospheric and oceanic optics : Aerosol detection
(280.1100) Remote sensing and sensors : Aerosol detection
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: September 10, 2007
Revised Manuscript: January 18, 2008
Manuscript Accepted: January 18, 2008
Published: March 31, 2008

Citation
Natalia Kouremeti, Alkiviadis Bais, Stelios Kazadzis, Mario Blumthaler, and Rainer Schmitt, "Charge-coupled device spectrograph for direct solar irradiance and sky radiance measurements," Appl. Opt. 47, 1594-1607 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-10-1594

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