白天天体光谱偏振成像技术及实验研究

Research on the Technique of Spectro-polarimetric Imaging of Celestial Bodies and Its Experiments in the Daytime

为了解决白天天体观测能力受限问题,采用光谱偏振成像技术,并结合天空背景偏振态实时测量方法,显著降低大气散射影响,将提高白天强背景下天体探测信噪比和对比度.讨论了针对天空强背景下天体光谱偏振成像探测原理,介绍了相关实验系统,开展了白天恒星光谱偏振成像实验研究,获得了星等为6.33的恒星目标实验结果,并与光谱强度图像进行了对比.实验结果表明了使用光谱偏振成像能够明显改善天体探测对比度,证明了光谱偏振成像技术能够很好地应用于白天天体天文观测研究.

It is very difficult to observe the celestial bodies in the daytime. The methods ofspectro-polarimetric imaging and the skylight polarization measurements in real-time are adopted to largely reduce influence of atmospheric scattering. The SNR and contrast of celestial bodies detection in the skylight background are enhanced. The principle of spectro-polarimetric imaging for the celestial bodies detection in the severely atmospheric scattering was discussed. The related experimental system was introduced. The experimental measurements of spectro-polarimetric imaging for the stars were performed. The 6.33^m star can be measured using spectro-polarimetric imaging in the daytime. This result of experiments was compared with that of spectral imaging. The results indicate that the contrast of celestial bodies detection using spectro-polarimetric imaging is enhanced obviously. Hence, it shows that the technique of spectro-polarimetric imaging can be applied to the research of celestial bodies observation in the daytime.