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Reduced uncertainties of field pyrheliometers through improved sensor calibration

Wilbert, Stefan and Janotte, Nicole and Pitz-Paal , Robert and van Wely, Leo and Geuder, Norbert (2010) Reduced uncertainties of field pyrheliometers through improved sensor calibration. Solar Paces 2010, Perpignan.

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Abstract

A decisive influence on the overall uncertainty of common field pyrheliometers is caused by their laboratory calibration using artificial light sources and instruments of the same kind as references. Alternative outdoor calibrations allow the use of an absolute cavity radiometer as a more accurate reference. As the sun is used as light source for these calibrations actual sky conditions can influence the outdoor calibration and have to be monitored. If test and reference instruments have different angular acceptance functions circumsolar radiation can have a crucial effect on the calibration accuracy. With outdoor calibrations carried out by DLR the calibration uncertainty of K&Z pyrheliometers could be reduced from 0.9% to approximately 0.4%.

Document Type:Conference or Workshop Item (Paper)
Title:Reduced uncertainties of field pyrheliometers through improved sensor calibration
Authors:
AuthorsInstitution or Email of Authors
Wilbert, Stefan DLR
Janotte, Nicole DLR
Pitz-Paal , Robert DLR
van Wely, Leo Kipp and Zonen
Geuder, Norbert CSP-Services
Date:September 2010
Keywords:solar irradiance, pyrheliometer, absolute cavity radiometer, circumsolar radiation, sunshape, calibration
Event Title:Solar Paces 2010
Event Location:Perpignan
Event Type:international Conference
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualifizierung (old)
Location: other
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Stefan Wilbert
Deposited On:21 Jan 2011 18:07
Last Modified:21 Jan 2011 18:07

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