太阳光特定波段光强快速检测方法研究

Study on Rapid Detection Method of Sunlight Specific Waveband Intensity

太阳光中各光质对植物光合和生理调节效果不同,分波段光强检测是设施农业高效补光的基础.针对现有特定波段光强检测仪器存在价格高及不易扩展等缺点,提出一种新型定波段光照快速检测方法.以红、蓝光为例,通过实验测量计算不同太阳高度角下特定波段光强占太阳光的百分比,并采用Matlab运用最小二乘法进行函数拟合,融合太阳高度角计算公式,建立了特定波段光强在太阳光所占百分比与日期、时间、经度及纬度四个参量之间的多参量耦合模型,通过实时检测太阳光光强快速计算了特定波段光强值.实验证明本方法测量误差小于4.5%,可满足补光系统分波段光强检测需求.

Different sunlight spectrua make different regulation on the photosynthesis and physiology of plants. The detection of different bands light intensity is the foundation of the highly efficient supplementary lighting. Because the existing specific band intensity detection instruments have the disadvantages of high cost and easy to expand, a new method of rapid detection of specific waveband intensity was presented. Taking red and blue as an example, the percentage of specific waveband accounting for sunlight was obtained. By using Matlab, the least squares method was adpoted for fitting function, combining with the calculation formula of sun elevation angle, and a multi-parameter coupling model between the percentage of specific waveband accounting for sunlight and the date, time, latitude and longitude was established. The specific waveband intensity was rapidly ca[culated by real-time detecting the intensity of sunlight. Experimental resuhs showed that measurement error of the method is less than 4.5 %, which can satisfy the need of light intensity detection of the sub-band of light filling system.