Measuring the Solar Radiation Spectrum in 4 Planes for Daylight and PV Applications
Abstract
For solar energy, radiative environment simulations and forecasts are becoming major challenges. To be validated, models have to be compared with ground measurements. The latter should be quite exhaustive: diffuse and direct components, in various representative planes, spectrum, sky images… They need to be reliable, providing uncertainties and going through a systematic quality control. This presentation describes our measurement system, the calibration of its components (optical fibers and spectrometers), and the error characterization. These measurements will be used to validate atmospheric information from satellites as well as spectral irradiances computed by various RTMs. Our objective is to produce long term variations of the solar spectrum in Lyon and recommend a modeling procedure.