白天天空背景对昼夜大气相干长度仪数据影响  

Influence of sky background on data of day-night atmospheric coherence length monitor

作　　者：陆茜茜[1,2] 侯再红[1] 靖旭[1] 贺巧妙[1,2] 何枫[1] 吴延徽[1,2] 

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室,安徽合肥230031 [2]中国科学院研究生院,北京100049

出　　处：《激光与红外》2012年第8期921-924,共4页Laser & Infrared

基　　金：国家"863"高科技项目资助

摘　　要：昼夜大气相干长度仪实现了全天候连续观测恒星,是一种大气相干长度的常规观测仪器。主要分析了白天天空背景光引起的大气相干长度测量误差,提出了适合于工程应用的图像消噪方法,并进行了数值仿真,结果表明:该消噪方法能有效抑制白天天空背景引起的图像传感器噪声,使其在最大天空亮度观测3.5等星时所引起的大气相干长度测量误差减小到1.434%,扩大了选星跟踪范围,证实了该消噪方法应用于提高仪器测量精度的可行性和白天星像质心提取的准确性。Day-night atmospheric coherence length monitor realizes all-weather stars observation. It is a conventional instrument to measure the atmospheric coherence length. The paper mainly analyzes the measurement error caused by sky background light in daytime, puts forward an image denoising method which is suitable for engineering applica- tion. Numerical simulation is made. The results show that the denoising method can effectively restrain image noise caused by sky background in daytime, makes the measurement error reduce to 1. 434% when observing magnitude 3.5 at the maximum sky brightness and expands the range of selection for tracking star.

关 键 词：大气光学 昼夜大气相干长度仪 误差分析 天空背景 图像抑噪 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]