Volume 6 Issue 2
Apr.  2013
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BU He-yang, LU Zhen-wu, ZHANG Hong-xin, SUN Ming-zhe. Suppresion of stray light ghost image in internally occulting refractive ground-based coronagraph[J]. Chinese Optics, 2013, 6(2): 231-236. doi: 10.3788/CO.20130602.0231
Citation: BU He-yang, LU Zhen-wu, ZHANG Hong-xin, SUN Ming-zhe. Suppresion of stray light ghost image in internally occulting refractive ground-based coronagraph[J]. Chinese Optics, 2013, 6(2): 231-236. doi: 10.3788/CO.20130602.0231

Suppresion of stray light ghost image in internally occulting refractive ground-based coronagraph

doi: 10.3788/CO.20130602.0231
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  • Corresponding author: LU Zhen-wu
  • Received Date: 2012-12-15
  • Rev Recd Date: 2013-02-16
  • Publish Date: 2013-04-10
  • In order to improve the imaging quality of coronagraphs, the ghost image caused by multi-reflection light from an objective lens for the internally occulting refractive ground-based coronagraph is analyzed at a band from 530 nm to 555 nm. The coronagraph with an aperture of 120 nm shows its main specifications in a field of view of 1.1 to 3R⊙, a resolution of 13.5 m, and F number of 8.2. The paper analyzes its imaging theory and establishes a model for the ghost image. Then, it presents the structure masking measures and performs an experimental demonstration. The experiment result shows that the masking structure is effective on the elimination of ghost image. In addition, the intensity of ghost image and the intensity of diffracted light of objective lens edge are basically the same. The experiment also illuminates that the size of ghost image is the same as the simulation result of 0.9 mm.The ghost image suppressing further improves the capability of elimination of stray light and the image quality of the coronagraph achieves the effective observation of the solar corona.
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