摘要
天幕灯是一款用于近距离照射大面积幕布的特殊灯具。为了在限定的区域内获得幕布的均匀照明,天幕灯需实现非对称、大角度的特定出射光强分布。基于几何光学和辐照度理论,首先建立满足幕布均匀照明要求的天幕灯配光曲线模型,然后再根据LED光源的发光特性进行二次光学设计,使LED天幕灯的出射光强分布与所需的配光曲线模型相匹配。根据能量守恒定律将配光曲线模型进行均匀离散化处理,建立直射和反射的有效叠加和补偿,依此设计得到反射面面型,实现照明要求。通过Zemax对所设计的LED天幕灯进行模拟仿真,结果表明,满足配光曲线的LED天幕灯可以通过多个灯具的简单照明叠加实现在近距离范围内对不同大小和形状的幕布进行均匀照明,其照明均匀度可达到85%以上,能量利用率可达到80%以上。
Cyclorama light is a luminaire specialized in lighting cyclorama at a close distance.The light shall be have an asymmetric intensity distribution and cove a large angular area in order to obtain uniform illumination on a cyclorama in a specific area.Based on the geometrical optics and the theory of irradiance,the luminous intensity distribution that satisfies the uniform illumination is calculated first.The secondary optical design based on the optical properties of the LED is developed,so that emergent light intensity distribution of the LED cyclorama light can match the luminous intensity distribution curve model.According to the law of conservation of energy,the luminous intensity distribution curve is equivalently divided in a discrete manner,and then effective superposition and compensation of directive rays and reflective rays are built.The reflective surface is designed according to the said method to realize the lighting requirements.The simulation of the designed LED cyclorama light by Zemax shows that cycloramas with different sizes and structure can be illuminated uniformly at a close distance through a simple lighting superposition of several designed LED cyclorama lights.The uniformity of illumination is above 85%and the energy efficiency is above 80%.
出处
《光学技术》
CAS
CSCD
北大核心
2014年第4期331-334,共4页
Optical Technique
关键词
非成像光学
光学设计
照明设计
non-imaging optics
optical design
illumination design
