LED组合光源的优化设计及其在温室植物生产中的应用
发布时间：2018-08-09 13:36
【摘要】：光是影响植物生长最关键的环境因素之一,温室大棚已完全使用人工光源进行生产活动。本文针对小功率LED的光照特性以及LED植物补光光源的结构特点,建立了红蓝光组合LED阵列的光照度分布模型,通过MATLAB仿真研究了LED组合光源光照度分布特性与变化规律。在此基础上研发了基于单片机控制的LED组合光源,克服了传统温室人工光源的不足,主要研究结果如下:1、测量了单颗红光、蓝光和远红光LED的光电参数,包括光谱分布特性、伏安特性、空间光强分布特性等,为后续的模拟仿真做好了准备。2、建立了单颗LED的光学模型,根据叠加原理推导出了两颗LED光源光照度合成公式并根据相同原理进一步推导出了单色光LED方阵和红蓝光LED组合阵列的光照度合成公式。根据斯派罗法则确定了LED间的最优化距离。3、采用两种不同形式的排列,方案一为红蓝光LED均匀间隔整行排列,方案二为每行每列中红、蓝光LED交错均匀排列,其中LED的间距可调。根据照度公式并基于MATLAB的数值计算表明:方案二优于方案一,其照明区域内的红、蓝光光通量比除边缘外基本均匀一致;对方案二LED阵列进行了详细仿真和分析,得到了光照度分布特性及变化规律,为LED组合光源设计提供了精确的参考依据。4、采用模块化设计理念,研制了基于单片机控制的LED组合光源。该光源采用STC12C5A60S2单片机实时监测LED基板温度和光强,并通过脉宽调制信号控制红、蓝光LED,对光质、光强、光周期和工作方式进行动态调节,以满足温室植物在不同阶段对补光量的需求。5、研究了红光、蓝光和远红光LED不同光质比例补光对绿萝扦插苗和石竹苗生长的影响,取得了良好的培养效果。结果表明,红光与远红光光通量之比(R/FR)与绿萝节总长、节间数、节长、叶片数和叶面积呈负相关,与绿萝叶绿素相对含量呈正相关。
[Abstract]:Light is one of the most important environmental factors affecting plant growth. Aiming at the illumination characteristics of low power LED and the structural characteristics of LED plant complementary light source, the illumination distribution model of red and blue light combination LED array is established, and the light intensity distribution characteristics and variation law of LED combined light source are studied by MATLAB simulation. On this basis, the LED combination light source controlled by single chip computer is developed, which overcomes the shortcoming of traditional artificial light source in greenhouse. The main research results are as follows: 1. The photoelectric parameters of single red light, blue light and far red light LED, including spectral distribution characteristics, are measured. The characteristics of volt-ampere, spatial intensity distribution, etc., are prepared for the subsequent simulation, and the optical model of a single LED is established. Based on the superposition principle, the light intensity synthesis formula of two LED light sources is derived, and the illumination synthesis formula of monochromatic LED square array and red and blue LED combination array is further deduced according to the same principle. According to the Sparrow rule, the optimal distance between LED. 3 is determined. Two different types of arrangement are adopted. The first scheme is the uniform interval between red and blue LED, and the second is red in each row, and the blue light LED is staggered and evenly arranged. The spacing of LED is adjustable. According to illuminance formula and numerical calculation based on MATLAB, it is shown that scheme two is superior to scheme one, and the ratio of red and blue luminous fluxes in the illumination region is basically uniform except for the edge. The simulation and analysis of scheme 2 LED array are carried out in detail. The light intensity distribution characteristics and variation law are obtained, which provides an accurate reference basis for the design of LED composite light source. The modular design concept is adopted to develop the LED combined light source based on single-chip microcomputer control. The STC12C5A60S2 single chip microcomputer is used to monitor the temperature and intensity of the LED substrate in real time, and the red and blue LEDs are controlled by pulse width modulation signal. The light quality, intensity, photoperiod and working mode are dynamically adjusted. In order to meet the needs of greenhouse plants in different stages of light supplementation, the effects of red light, blue light and far red LED on the growth of green apple cuttings and carnation seedlings were studied, and the results showed that the effects of different ratios of light and quality on the growth of green apple cuttings and carnation seedlings were better than those of red light, blue light and far red light. The results showed that the ratio of red light to far red light flux (R/FR) was negatively correlated with total node length, internode number, node length, leaf number and leaf area, and positively correlated with chlorophyll relative content.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S123;S625
本文编号：2174238
[Abstract]:Light is one of the most important environmental factors affecting plant growth. Aiming at the illumination characteristics of low power LED and the structural characteristics of LED plant complementary light source, the illumination distribution model of red and blue light combination LED array is established, and the light intensity distribution characteristics and variation law of LED combined light source are studied by MATLAB simulation. On this basis, the LED combination light source controlled by single chip computer is developed, which overcomes the shortcoming of traditional artificial light source in greenhouse. The main research results are as follows: 1. The photoelectric parameters of single red light, blue light and far red light LED, including spectral distribution characteristics, are measured. The characteristics of volt-ampere, spatial intensity distribution, etc., are prepared for the subsequent simulation, and the optical model of a single LED is established. Based on the superposition principle, the light intensity synthesis formula of two LED light sources is derived, and the illumination synthesis formula of monochromatic LED square array and red and blue LED combination array is further deduced according to the same principle. According to the Sparrow rule, the optimal distance between LED. 3 is determined. Two different types of arrangement are adopted. The first scheme is the uniform interval between red and blue LED, and the second is red in each row, and the blue light LED is staggered and evenly arranged. The spacing of LED is adjustable. According to illuminance formula and numerical calculation based on MATLAB, it is shown that scheme two is superior to scheme one, and the ratio of red and blue luminous fluxes in the illumination region is basically uniform except for the edge. The simulation and analysis of scheme 2 LED array are carried out in detail. The light intensity distribution characteristics and variation law are obtained, which provides an accurate reference basis for the design of LED composite light source. The modular design concept is adopted to develop the LED combined light source based on single-chip microcomputer control. The STC12C5A60S2 single chip microcomputer is used to monitor the temperature and intensity of the LED substrate in real time, and the red and blue LEDs are controlled by pulse width modulation signal. The light quality, intensity, photoperiod and working mode are dynamically adjusted. In order to meet the needs of greenhouse plants in different stages of light supplementation, the effects of red light, blue light and far red LED on the growth of green apple cuttings and carnation seedlings were studied, and the results showed that the effects of different ratios of light and quality on the growth of green apple cuttings and carnation seedlings were better than those of red light, blue light and far red light. The results showed that the ratio of red light to far red light flux (R/FR) was negatively correlated with total node length, internode number, node length, leaf number and leaf area, and positively correlated with chlorophyll relative content.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S123;S625
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