摘要
闪光灯反光罩结构设计的目标是使得所拍摄视场内的光能量分布尽量均衡。不同于基于几何光学理论的闪光灯计算和设计方法,采用了蒙特卡罗光子追迹法来分析闪光灯的结构设计。通过对照相机闪光灯几何结构的分析,引入余弦随机变量等方法,建立了闪光灯系统中光源、反光罩、菲涅耳透镜等部件的数学模型。先用蒙特卡罗光子追迹法模拟了单光子在闪光灯中飞行的各种可能状态,再通过产生大量光子仿真真实的情况。并对一个具体的闪光灯结构进行了计算,计算得到了光强和光子方向矢量在水平、垂直两个方向的投影角之间的分布曲线图。仿真结果符合设计要求并与实测曲线很接近,从而验证了蒙特卡罗光子追迹法在闪光灯结构设计中的可行性。
Better distribution of the light energy in the field of view is the aim of the structure design of flashlight. Instead of the geometrical optics approaches, the Monte Carlo photon tracing method was used to analyze the structure design of flashlight. After analyzing and modeling of the camera flashlight structure （such as the light source, reflectors and Fresnel lens）, and introducing cosine random number and other methods, we built up the model of a flashlight. At first, a single photon was traced using Monte Carlo method to simulate the behavior of the flights. Then, a large sum of photons were generated to simulate the real situation happened in the flashlight. At last, the light intensity and direction vector of photon distribution in the orthogonal coordinates was achieved. The simulated result meets the requisition and is very close to the measured one. The feasibility of using the Monte Carlo photon tracing method in the design of flashlight is proved.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2007年第2期335-339,共5页
Acta Optica Sinica
关键词
发光学
光子追迹
蒙特卡罗法
闪光灯
建模
luminescence
photon tracing
Monte Carlo method
flashlight
model
