光电式日照计室内检定中散射辐射模拟方法研究

Study on Simulation Method of Diffuse Radiation for Indoor Verification of Photoelectric Insolation Meter

由于光电式日照计中散射辐射光电传感器的测量精度会严重影响日照计测量太阳辐照度的准确性,为降低散射误差,在室内检定时需进行较为准确的散射辐射模拟。通过对逐日时间尺度下辐射衰减率与各气象因子间的线性相关性分析,进行多元线性回归拟合后得出长春地区逐日水平面太阳散射辐射模型,并在室内检定系统中对水汽、尘埃等散射作用造成的辐射衰减进行了模拟,设计了室内散射环境模拟室。实验结果表明,水平面太阳日散射辐射量的拟合值与实测值匹配较好,实测值与拟合值均匀分布在拟合线两侧,相关系数(R^(2))在0.8以上,表明散射辐射模型效果较好。

Because the measurement accuracy of the diffuse radiation photoelectric sensor in the photoelectric insolation meter seriously affects the accuracy of the solar irradiance measurement,in order to reduce the scattering error,more accurate simulation of the diffuse radiation is needed for indoor calibration.Through the linear correlation analysis between the radiation attenuation rate and each meteorological factor in the day-by-day time scale,the daily horizontal solar scattering radiation model in Changchun area is obtained after multivariate linear regression fitting.The radiation attenuation caused by the scattering of water vapor and dust is simulated in the indoor verification system,and the indoor scattering environment simulation chamber is designed.The results show that the fitted values of the daily scattered radiation in the horizontal plane are well matched with the measured values.The measured values and fitted values are evenly distributed on both sides of the fitted line,and the correlation coefficient(R^(2))is above 0.8,indicating that the scattered radiation model has a good effect.