基于LED阵列光源的太阳模拟器

针对目前LED太阳模拟器辐照度低、光谱匹配性差等不足,提出一种由LED阵列光源,菲涅尔透镜、光学积分器、准直物镜组成的LED太阳模拟器。首先根据多光谱拟合理论,在400~1 100nm优选15种不同波段的LED光源,计算出光源所需功率,实现太阳光谱的精确匹配。其次优化设计了菲涅尔透镜、光学积分器以及准直物镜,校正了太阳模拟器的像差,提高了太阳模拟器的能量利用效率以及辐照均匀性,并利用LightTools软件对所设计的光学系统进行仿真分析。最后搭建了光学系统实验装置,测试结果表明:100mm×100mm内的辐照度达到1 376.3 W/m~2;拟合的太阳光谱匹配度达到AM1.5条件中的A级,辐照不均匀度为±1.73%,辐照不稳定度为±0.82%,综合性能指标达到太阳模拟器中的3A级水平。

Solar simulator based on LED array light source

Addressing the deficiencies of solar simulators, such as low radiation intensity and poor spectral matching, an LED solar simulator consisting of an LED array light source module, Fresnel focusing lens, optical integrator, and collimator lens is proposed. Firstly, according to the principle of multispectral fitting, 15 LED light sources with different wavelengths are optimally selected in the spectral range of 400-1 100 nm, and their light source power is calculated to realize an exact match of the solar spectrum. Secondly, the design of the Fresnel lens, optical integrator, and collimator lens is optimized to correct the aberrations of the sun simulator and improve its energy utilization efficiency and irradiation surface nonuniformity. The optical system is simulated using the LightTools software. Finally, an experimental device of the optical system is built, its fitted spectra reaching the A level according to the AM1.5 conditions, a radiation intensity of 1 376.3 W/m² from an area of 100 mm×100 mm, an irradiation nonuniformity of ±1.73%, and an irradiation instability of ±0.82%. The overall performance of the solar simulator satisfied the Triple-A level.