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SPECKLE NOISE SUBTRACTION AND SUPPRESSION WITH ADAPTIVE OPTICS CORONAGRAPHIC IMAGING
Deqing Ren; Jiangpei Dou; Xi Zhang; Yongtian Zhu
2012-07-10
Source PublicationThe Astrophysical Journal
Volume753Issue:2Pages:99-109
Abstract
Future ground-based direct imaging of exoplanets depends critically on high-contrast coronagraph and wave-front manipulation. A coronagraph is designed to remove most of the unaberrated starlight. Because of the wave-front error, which is inherit from the atmospheric turbulence from ground observations, a coronagraph cannot deliver its theoretical performance, and speckle noise will limit the high-contrast imaging performance. Recently, extreme adaptive optics, which can deliver an extremely high Strehl ratio, is being developed for such a challenging mission. In this publication, we show that barely taking a long-exposure image does not providemuch gain for coronagraphic imaging with adaptive optics. We further discuss a speckle subtraction and suppression technique that fully takes advantage of the high contrast provided by the coronagraph, as well as the wave front corrected by the adaptive optics. This technique works well for coronagraphic imaging with conventional adaptive optics with a moderate
Strehl ratio, as well as for extreme adaptive optics with a high Strehl ratio. We show how to substrate and suppress speckle noise efficiently up to the third order, which is critical for future ground-based high-contrast imaging. Numerical simulations are conducted to fully demonstrate this technique.
KeywordMiscellaneous Planetary Systems High Angular Resolution Image Processing
Subject Area自适应光学 ; 系外行星探测
WOS IDWOS:000305912700006
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/679
Collection期刊论文
Recommended Citation
GB/T 7714
Deqing Ren,Jiangpei Dou,Xi Zhang,et al. SPECKLE NOISE SUBTRACTION AND SUPPRESSION WITH ADAPTIVE OPTICS CORONAGRAPHIC IMAGING[J]. The Astrophysical Journal,2012,753(2):99-109.
APA Deqing Ren,Jiangpei Dou,Xi Zhang,&Yongtian Zhu.(2012).SPECKLE NOISE SUBTRACTION AND SUPPRESSION WITH ADAPTIVE OPTICS CORONAGRAPHIC IMAGING.The Astrophysical Journal,753(2),99-109.
MLA Deqing Ren,et al."SPECKLE NOISE SUBTRACTION AND SUPPRESSION WITH ADAPTIVE OPTICS CORONAGRAPHIC IMAGING".The Astrophysical Journal 753.2(2012):99-109.
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