Results of a Training Exercise in the Comparison and Calibration of Pyranometers and Pyrheliometers

摘要

An intercomparison and calibration exercise involving the National Weather Service (NWS), participants in the Solar Energy Meteorological Research and Training Sites Program (SEMRTS), and the Solar Energy Research Institute (SERI) was conducted at the NWS Forcast Office in Burlington, Vermont. The exercise involved applying classical comparison and calibration techniques to pyranometers and pyrheliometers. As well as demonstrating the techniques for acquiring and reducing calibration data, analysis of the data indicates the relative performance of the instruments tested and the effects of the radiation distribution and meteorological parameters on the calibrations. Variability in calibration results within a day amounted to +- 5.0% and was repeatable from day to day within about +- 2.0%. The solar evaluation angles were between 35 and 68 exp 0 , and the diffuse-to-global radiation ratio was on the order of 20%. (ERA citation 07:061048)