Quantitative Analysis of Spectral Impacts on Silicon Photodiode Radiometers: Preprint

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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 ... continued below

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8 p.

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Myers, D. R. April 1, 2011.

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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.

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8 p.

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  • Report No.: NREL/CP-5500-50936
  • Grant Number: AC36-08GO28308
  • Office of Scientific & Technical Information Report Number: 1012503
  • Archival Resource Key: ark:/67531/metadc833291

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Office of Scientific & Technical Information Technical Reports

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  • April 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • April 6, 2017, 3:22 p.m.

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Myers, D. R. Quantitative Analysis of Spectral Impacts on Silicon Photodiode Radiometers: Preprint, article, April 1, 2011; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc833291/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.