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为了实现直接辐射的太阳能量的耦合,设计了一种分光谱辐射表入射系统。根据气象辐射理论对直接辐射表的尺寸进行约束,利用几何光学理论设计导光锥,使收光筒与光纤部分实现低损耗连接,解决光纤与收光筒直接耦合时能量较弱的问题.通过在太阳模拟器下模拟的真实辐照度,测试整个入射系统不同波长处的耦合效率,以及不同跟踪角度误差下耦合效率的变化.理论分析表明,导光锥和光纤两轴线的横向偏移是引起耦合损耗的主要因素.实验结果表明:系统的耦合效率为66.24%,在太阳跟踪器完全跟踪不到太阳直接辐射时,耦合效率为12.8%,反映了环日辐射和散射辐射水平.该系统可满足太阳直接辐射观测的入射系统要求.
In order to realize the coupling of the direct solar radiation, a spectroradiometer incident system is designed. According to the theory of meteorological radiation, the size of the direct radiation meter is constrained, and the light guide cone is designed based on the theory of geometrical optics, so that the light-receiving tube and the optical fiber part are connected in low loss so as to solve the problem that the energy is weak when the optical fiber is directly coupled with the light- The real irradiance simulated under the solar simulator, the coupling efficiency at different wavelengths of the whole incident system and the coupling efficiency under different tracking angle errors were analyzed.Theoretical analysis shows that the lateral offset of the two cones of the light guide cone and the optical fiber is The main factors causing the coupling loss are as follows: The experimental results show that the coupling efficiency of the system is 66.24%, and the coupling efficiency is 12.8% when the solar tracker can not directly track the direct solar radiation, which reflects the level of annular and scattered radiation. Meet the incident system requirements for direct solar radiation observations.