International Spectroradiometer Intercomparison 2024 - Final report
The International Spectroradiometer Intercomparison (ISRC) is a metrological event in the field of solar radiation measurements. The ISRC is managed by the European Solar Test Installation (ESTI) laboratories of the European Commission Joint Research Centre on an annual basis. The 12th edition was held in June 2024 at the Joint Research Centre site of Ispra, Italy.
The event consisted of a week of uninterrupted measurements of the solar radiation by the instruments of different participants, with the ESTI instrumentation acting as reference for the performance evaluation of spectroradiometers, pyranometers and pyrheliometers. Spectroradiometers were assessed also using the artificial light source of Apollo, a large area steady state solar simulator of ESTI.
Starting in 2011, the first ISRC focused primarily on photovoltaic research and applications. Over the years, the range of interested participants has gradually expanded, encompassing not only laboratories in the PV field, but also space agencies, national metrological institutes (NMI), university and research groups, manufacturers of measurement equipment operating in the fields of climatology and meteorology.
The physical quantities measured during the campaign were the broadband solar irradiance (direct, diffuse and global normal) and the spectrally resolved spectral irradiance (direct and global normal).
The present report summarizes the results of the Intercomparison, divided in four main sections: in the first section the performance of the broadband irradiance sensors is presented; the second and third are dedicated to the performance indicators of the spectroradiometers in outdoor conditions using natural sunlight and indoor using the Apollo solar simulator; the fourth contains a summary of the prototype instruments present at the Intercomparison.
Prototype instruments were not comparable directly with the reference instruments; their interest in participating at the ISRC was mainly to collect data for further development of the instruments or validation of mathematical models.
PAVANELLO Diego;
ALESSANDRINI Stefano;
THIEL Christian;
2025-03-24
Publications Office of the European Union
JRC141156
978-92-68-25543-8 (online),
1831-9424 (online),
EUR 40257,
OP KJ-01-25-171-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC141156,
10.2760/7023588 (online),
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