作者：宋海翔, 陈乐, 孟思圆, 王圣彬
作者单位：中国计量大学，浙江 杭州 310008
关键词：太阳能;定日镜;积尘;检测;灰度值;光照强度
摘要：
为解决反射率测量仪检测定日镜镜面反射率时接触式检测带来的破坏镜面和污染检测设备的问题，使用CCD传感器作为检测设备进行非接触式检测，并在隔绝外界光照影响的暗箱内，以LED作为光源，研究光照强度对CCD检测定日镜镜面积尘密度的影响，并将实验结果与现有应用成熟的反射率测量仪测试结果进行对比。结果表明，CCD传感器检测定日镜积尘密度的方法可以明确区分不同积尘密度的定日镜，当灰尘粒径为10 μm时，镜面积尘密度的有效检测范围在0~6 g/m2，对应的镜面反射率范围在74%~93%；并且在照度固定的前提下，镜面反射率、积尘密度、镜面图像灰度值存在显著相关性。研究结果可为塔式太阳能光热发电站的定日镜积尘密度检测提供一定的参考。
CCD sensor-based method for detecting the dust density of heliostat
SONG Haixiang, CHEN Le, MENG Siyuan, WANG Shengbin
China Jiliang University, Hangzhou 310008, China
Abstract: In order to solve the problem of damage to the mirror surface and contamination of the detection equipment when the reflectance measuring instrument contact detecting the heliostat reflectance, this paper proposed a non-contact detection method: in the camera obscura isolated from the influence of external light, CCD sensor is used as the detection equipment, and LED is used as the light source to study the influence of light intensity on the dust density of CCD sensor detection mirror area, and the experimental results were compared with the test results of the mature reflectivity measuring instrument. The result shows, the method of detecting the dust density of heliostats by the CCD sensor can clearly distinguish heliostats with different dust densities. When the particle size of dust is 10 μm, the effective detection range of the dust density of the mirror area is 0-6 g/m2, and the mirror reflectivity of the heliostat is 74%-93%; Under the premise of fixed illuminance, there is a significant correlation between the mirror reflectivity, the dust density, and the gray value of mirror image. The research results can provide a certain reference for the detection of the dust density of heliostats in tower solar thermal power stations.
Keywords: solar energy;heliostats;dust;detection;gray value;light intensity
2022, 48(3):27-34 收稿日期: 2021-03-01;收到修改稿日期: 2021-04-30
基金项目: 国家重点研发计划（2017YFF0210702）
作者简介: 宋海翔（1995-），男，江苏徐州市人，硕士研究生，专业方向为定日镜积尘度检测
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