Quantitative analysis of spectral impacts on silicon photodiode radiometers
Subtitle: preprint
By: D.R. Myers
Contributors: National Renewable Energy Laboratory (U.S.)
Series: NREL/CP -- 5500-50936; Conference paper (National Renewable Energy Laboratory (U.S.)) -- 5500-50936.
Publisher: National Renewable Energy Laboratory
Published: 2011
Place of publication: Golden, CO]
Language: eng
Format: [electronic resource] :
Subjects: Solar radiation; Measurement; Spectral irradiance; Radiometers
Description: Inexpensive broadband pyranometers with silicon photodiode detectors have a non-uniform spectral response over the spectral range of 300-1100 nm. The response region includes only about 70% to 75% of the total energy in the terrestrial solar spectral distribution from 300 nm to 4000 nm. The solar spectrum constantly changes with solar position and atmospheric conditions. Relative spectral distributions of diffuse hemispherical irradiance sky radiation and total global hemispherical irradiance are drastically different. This analysis convolves a typical photodiode response with SMARTS 2.9.5 spectral model spectra for different sites and atmospheric conditions. Differences in solar component spectra lead to differences on the order of 2% in global hemispherical and 5% or more in diffuse hemispherical irradiances from silicon radiometers. The result is that errors of more than 7% can occur in the computation of direct normal irradiance from global hemispherical irradiance and diffuse hemispherical irradiance using these radiometers.
Notes: Title from title screen (viewed April 25, 2011).

"April 2011."

"To be presented at SOLAR 2011, Raleigh, North Carolina, May 17-21, 2011."

Includes bibliographical references (p. 5-6).

DE-AC36-08GO28308

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