摘要
针对环境温度、光质和光强对农作物光合作用的影响,提出结合实时环境检测、特定波段补光与定量决策的精确补光方法,设计了基于反馈控制机制的定量决策算法。以单片机为核心控制器件,设计了可调光质的精准补光系统,可根据温度及红蓝光目标光强与实时光强的差值精确计算补光量,通过PWM占空比调整LED输出光强。实验结果证明系统可实现按需补光;采用的LED光源较白炽灯节能54%,较荧光灯节能83%;在相同LED光源时,较常规LED补光系统的节能率在不同光质阈值和气候条件下具有一定波动,平均节能在30%以上。
A precise light compensating method integrated with real-time environmental monitoring, specific wavelength light complementing and quantitative decision-making was proposed. Based on feedback control mechanism, a quantitative decision-making algorithm was put forward. Using a single chip as the central control unit, the light complementing value was accurately calculated based on the environmental temperature and the difference between target and real-time values of light intensity of red and blue light. Light intensity output of LED was adjusted by PWM duty cycle to meet the demand of light complementing. Experimental results show that the system has achieved quantitative muhi-waveband light complementing. And it realized the energy saving of 54% and 83% respectively to filament lamp and fluorescent. With the same LED, the system has an average energy saving ability of 30% or more compared to the existed LED light compensating system, and the energy saving rate fluctuated at different light quality thresholds and environment conditions.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2012年第3期181-186,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
核高基重大专项(2010ZX01045-001-004)
陕西省科学技术研究发展计划项目(2010K01-21)
以大学为依托的农业科技推广模式建设项目(XTG2010-2)
关键词
设施农业
发光二极管
精确补光
可调光质
Greenhouse agriculture, LED, Precise light compensating, Light quality adjustable
