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Digital Camera-Based Quick and Accurate Measurement of Solar Simulator Uniformity
Y. Hishikawa, H. Shimura, Y. Nakanishi, T. Hashimoto
Components for PV Systems
Subtopic: PV Modules
Event: 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain
Session: 4AV.3.69
2974 - 2977
ISBN: 3-936338-24-8
Paper DOI: 10.4229/23rdEUPVSEC2008-4AV.3.69
0,00 EUR
Document(s): paper


The importance of uniformity measurements of solar simulator light has become more significant than before, as the module size has become bigger, and also as the requirement for the measurement accuracy has become more precise. In this study, a digital camera-based novel technology for accurately measuring the solar simulator uniformity is presented, and its usefulness is demonstrated. The method of the present study is based on photographing the distribution of the solar simulator light, which is projected on a screen. The digital data of the photograph are converted into irradiance by considering the characteristics of the camera and the screen, such as the uniformity and linearity, etc. It has advantage over the conventional method that the measurement is quick (order of millisecond or faster). Therefore, the same setup is applicable to both pulsed and continuous solar simulators. One flash of pulsed simulator is enough for the uniformity measurement. Also, the spatial resolution is high, enabling the uniformity data of many points (hundreds or more) measured by one shot. The measured uniformity data are applicable to various kinds of PV modules such as c-Si modules and integrated thin-film modules. Preliminary experiments have shown that the present method of uniformity measurement typically agrees with the conventional method within ~ 0.4% or better, which can be used for measuring, monitoring, and adjusting the solar simulator uniformity. Typical procedure of the measurement and the requirements for the hardware and software are also discussed.