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Proceedings Paper

CCD fiber optic spectrometer for the measurement of spectral irradiance
Author(s): J. U. Morley; L. J. B. McArthur; D. Halliwell; Y. Poissant; S. Pelland
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Paper Abstract

Recent technological advancements have made CCD spectrometers an increasingly suitable alternative to traditional monochromator-based instrumentation. The authors have developed instrumentation for the near instantaneous measurement of spectral global, direct, diffuse, reflected and southward-tilted irradiances. The system uses an AvaSpec2048TEC-2 - a dual channel thermo-electric-cooled fiber optic spectrometer from Avantes Inc. Each channel has a 2048-pixel linear array detector and the system achieves a spectral resolution of 0.0007 μm (FWHM) over the range 0.241-1.1 μm. The system also includes sensor heads, fiber optic cables and a multiplexer. Two types of sensor heads have been developed: a pyrheliometer configuration for direct beam, and a pyranometer configuration for global, diffuse, reflected and tilted measurements. Calibration uses a system of standard light sources. Cosine errors inherent to the spectralon diffusers have been characterized and corrections are applied to data from each sensor head. Accuracy of global irradiance is examined by comparing measurements against global photosynthetically active radiation (PAR) (0.395 - 0.695 μm) from Eppley red and green dome pyranometers. PAR daily totals (MJ/m2/day) and one minute averages (W/m2) are compared for 35 days in 2009 and daily totals are within ± 10% from June to October.

Paper Details

Date Published: 19 August 2010
PDF: 12 pages
Proc. SPIE 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, 77730U (19 August 2010); doi: 10.1117/12.860872
Show Author Affiliations
J. U. Morley, Environment Canada (Canada)
L. J. B. McArthur, Environment Canada (Canada)
D. Halliwell, Environment Canada (Canada)
Y. Poissant, Natural Resources Canada (Canada)
S. Pelland, Natural Resources Canada (Canada)

Published in SPIE Proceedings Vol. 7773:
Reliability of Photovoltaic Cells, Modules, Components, and Systems III
Neelkanth G. Dhere; John H. Wohlgemuth; Kevin Lynn, Editor(s)

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