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Laboratory test of a polarimetry imaging subtraction system for the high-contrast imaging
Jiangpei Dou; Deqing Ren; Yongtian Zhu; Xi Zhang; Rong Li
2012-09-24
Source PublicationGround-based and Airborne Instrumentation for Astronomy IV
Volume8446
Issue8446
PagesVol.8446 8D-1-8
Conference Date2012-7-1
Conference PlaceAmsterdam, Netherlands
Funding OrganizationThe International Society for Optical Engineering
PublisherSPIE
Abstract
We propose a polarimetry imaging subtraction test system that can be used for the direct imaging of the reflected light from exoplanets. Such a system will be able to remove the speckle noise scattered by the wave-front error and thus can enhance the high-contrast imaging. In this system, we use a Wollaston Prism (WP) to divide the incoming light into two simultaneous images with perpendicular linear polarizations. One of the images is used as the reference image. Then both the phase and geometric distortion corrections have been performed on the other image. The corrected image is subtracted with the reference image to remove the speckles. The whole procedure is based on an optimization algorithm and the target function is to minimize the residual speckles after subtraction. For demonstration purpose, here we only use a circular pupil in the test without integrating of our apodized-pupil coronagraph. It is shown that best result can be gained by inducing both phase and distortion corrections. Finally, it has reached an extra contrast gain of 50-times improvement in average, which is promising to be used for the direct imaging of exoplanets.
KeywordExoplanets High-contrast Imaging Polarimetry Subtraction Algorithm Phase And Distortion Corrections Image Processing
Subject Area系外行星探测
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/664
Collection中国科学院南京天文光学技术研究所_会议论文
Recommended Citation
GB/T 7714
Jiangpei Dou,Deqing Ren,Yongtian Zhu,et al. Laboratory test of a polarimetry imaging subtraction system for the high-contrast imaging[C]:SPIE,2012:Vol.8446 8D-1-8.
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