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在相对湿度高和浮游粒子多的地区,由于日光特别是紫外线放射在天空中散射,因此聚光效率大大减小,加速倍率极大降低。通常使用的试验装置备有垂直且自动跟踪太阳照射光光轴的机构,即具有10枚菲涅尔反光镜和在其照射面上安装试样机构的结构,菲涅尔反射镜在295～750nm的紫外区和可见区的波长区域保持高的光谱反射率,在310nm的
In areas where the relative humidity is high and the number of floating particles is large, since the sunlight, especially the ultraviolet radiation, scatters in the sky, the light condensing efficiency is greatly reduced and the acceleration magnification is greatly reduced. The commonly used test device is equipped with a mechanism for vertically and automatically tracking the optical axis of the sun’s light, that is, a structure having 10 Fresnel reflectors and a sample mechanism mounted on its irradiation surface. The Fresnel mirror operates at 295 to 750 nm The UV region and the visible region of the wavelength region maintain high spectral reflectance at 310 nm