摘要
差分图像运动监测仪广泛应用于视宁度的实时测量.利用随机相位屏和光学离焦像差模拟差分图像运动,分析了差分图像运动监测仪的测量准确度,结果表明差分图像运动监测仪能够可靠地测量地面处湍流.在国家天文台兴隆观测站,开展了两台相同硬件配置的差分图像运动监测仪的对比实验,分析曝光时间的影响和测量结果的相关性.结果表明:有限曝光时间降低差分图像运动,使视宁度值测量值偏小;视宁度测量结果的时间变化趋势和统计结果一致性较好.
Differential image motion monitor is widely used to obtain real-time seeing. Differential image motion was numerical simulated by random phase screen and optical defocus aberration, and the measurement accuracy of differential image motion monitor was analyzed, which showed that differential image motion monitor can reliably measure the near-ground turbulence. Comparision of experiment o; two differential image motion monitors with the same hardwares was carried out at Xinglong Station of National Astronomical Observatory of China. The correlation between exposure time and measuring results was analyzed. The results show that the limited exposue time will reduce differential image motion and underestimate seeing value, and the trends over time and statistics of measurement results have good consistency.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2014年第12期56-61,共6页
Acta Photonica Sinica
基金
国家自然科学基金(No.11103050)
"光谱成像与智能感知"江苏省重点实验室开放基金(No.3092014012200409)资助
关键词
大气光学
湍流
视宁度
数值模拟
对比实验
天文选址
高分辨率
Atmospheric optics
Turbulence
Seeing
Numerical simulation
Comparison of experiment
Site testing
High angular resolution
