Field Comparison Analysis of Spectroradiometer and Electrothermic Solar Radiometer
LIU Li-ying1, 2, 3, 4, LI Ning3, ZHENG Feng1, 2, 3, 4, HU Xiao-xu3, LI Hui3, SHAO Chang-liang5, CHONG Wei5, WU Zhi-feng6, HUA Wei-dong3, 4, ZHANG Yong-hong1, 2
1. State Key Laboratory of Climate System Prediction and Risk Management/Key Laboratory of Meteorological Disaster, Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
2. School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China
3. Aerospace New Sky Technology Co., Ltd., Wuxi 214127, China
4. Jiangsu Radio Science Research Institute Co., Ltd., Wuxi 214127, China
5. Meteorological Observation Centre of China Meteorological Administration, Beijing 100081, China
6. Division of Optics, National Institute of Metrology, China, Beijing 100029, China
Abstract：The precise measurement of solar spectral irradiance is crucial in fields such as meteorological monitoring, climate change research, and solar energy applications. Traditional thermopile radiometers have been widely used for long-term observations, but their measurement accuracy is limited due to spectral mismatch errors. Spectroradiometers, as advanced precision measurement instruments, can provide high spectral resolution data, offering a new technical approach for refined measurements of solar radiation. This study systematically analyzes the measurement consistency and sources of deviation between spectroradiometers and thermopile radiometers through field intercomparison experiments. The results indicate that under clear-sky conditions, the measurement data from both instruments exhibit a high linear correlation(DNI fitting residuals <0.5%, GHI fitting residuals <5%). In the solar spectral absorption peak regions, the spectroradiometer reveals more detailed spectral structures, making it useful for evaluating the spectral errors of thermopile radiometers. Based on the ISO 9060: 2018, this study verifies the feasibility of using spectroradiometers to quantify the spectral errors of thermopile radiometers. It highlights the significant influence of the solar zenith angle on measurement errors. Under high optical air mass conditions (AM>5), the measurement results from spectroradiometers and thermopile radiometers exhibit more pronounced nonlinear deviations, reflecting the interplay among atmospheric scattering characteristics, instrument field-of-view angles, and spectral response curves. The findings from the field intercomparison analysis suggest that spectroradiometers serve as a valuable supplementary tool for refined solar radiation measurements and are essential for characterizing the spectral errors of thermopile radiometers. In the future, the integrated application of spectroradiometers and traditional radiometers could further enhance the accuracy of solar radiation observations, providing more reliable data support for meteorology, environmental monitoring, and renewable energy applications.
Key words：Spectroradiometer; Thermopile radiometer; Field intercomparison; Spectral error; Solar spectral monitoring
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