太阳跟踪聚光高加速老化试验系统特性研究

Characteristics of Highly Accelerated Weathering Test System with Sun Tracking Concentrated Device

目的对自主研制的基于“冷光”反射镜户外高加速光老化系统特性展开研究。方法利用大气环境条件监测技术获得系统样机关键性能数据。结果“冷光”反射镜在295~700nm波长范围内的反射率达到90%以上,增强了系统样机在该波长范围内的反射太阳光谱,在310nm波段处获得约3.5倍太阳直射辐照强度。聚光太阳辐照分布均匀,靶板处平均辐照强度最大可达0.655W/(m^2·nm),标准偏差为2.6%。白天样品表面温度不超过直接暴露样品表面温度10℃,样品周围空气湿度与大气相对湿度接近,并可通过喷淋系统控制样品周围空气的相对湿度,以模拟多种自然气候环境。结论经过对比系统太阳光谱、辐照强度及温湿度等特性数据,系统增强了紫外辐照强度,并有效控制了试验样品的温度和湿度,可为系统自然加速试验老化机理及相关性研究提供数据支持。

Objective To research on characteristics of outdoor highly accelerated photo-aging system based on "cold light" reflector.Methods Key performance data of the system prototype were obtained through the monitoring technology of atmospheric environmental conditions.Results The "cold light" reflector had a reflectance of over 90% in the wavelength range of 295 to 700 nm,which enhanced the reflected solar spectrum of the system prototype in this wavelength range,and obtained 3.5 times of direct solar radiation intensity in the 310 nm band;concentrated solar irradiation was distributed uniformly,and the average irradiation intensity at the target plate could reach up to 0.655 W/(m^2·nm),the standard deviation was 2.6%.The surface temperature of the sample during the day did not exceed that of the directly exposed one by 10 ℃.The air humidity around the sample was close to the atmospheric relative humidity.The air relative humidity around the sample could be controlled through the spray system to simulate various natural climate environments.Conclusion After comparing the solar spectrum,irradiation intensity and temperature and humidity of the system,it indicates that the system enhances the UV irradiation intensity and effectively controls the temperature and humidity of the test sample.The research can prove data support for study on aging mechanism of natural accelerated test and correlation of the system.