摘要
在红外系统中,冷屏的开孔形状直接影响着它对杂散光的抑制效能。利用光度无效性来评价冷屏形状抑制红外系统杂光的能力,提出了利用叠加积分精确计算任意形状冷屏的光度无效性的新思路和算法,建立了数学模型,通过对一个典型288×4热像系统的实例计算,与光线统计法的运算结果进行比较,结果相一致,且与光线统计法精度相同的情况下,具有运算速度快的优势。
The aperture shapes of cold shields have direct effects on stray light suppressing in infrared systems. The concept of photometric inefficiency is introduced to evaluate the cold shield shapes＇ ability of suppressing stray light. A creative idea and algorithm of using the superposition integral method to accurately calculate the photometric inefficiency for all shapes of cold shields are proposed. Based on the method, a mathematical model is built. A typical 288 × 4 thermal imager is chosen as an instance to be calculated by the program. Compared with the results calculated by the ray tracing statistical method, it is concluded that superposition integral method has accordant results to the ray tracing statistical method, which has far higher speed of computation than ray tracing statistical method when they get the same accuracy.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第3期130-136,共7页
Acta Optica Sinica
关键词
光计算
红外光学
光度无效性
叠加积分法
冷屏
立体角
optics in computing
infrared optics
photometric inefficiency
superposition integral method
cold shield
solid angle
