The optical system of the large field space target search camera is composed of multiple lenses, when stray light enters the field of view, ghost images will be generated on the image plane, which will affect the target extraction, and ghost images must be suppressed. At first, the image of the moonlight in the field of view and the centroid data of the star point in the ground observation test of the actual search camera are analyzed, and it is determined that the ghost image region has the wrong extraction of the clutter. Then, according to the characteristics of the large field of view optical system, combined with the optical design software ZEMAX simulation, the cause of the ghost image is determined. Finally, the method of adding optical cut-off film on the glass protective cover of the detector is proposed to suppress the abnormal ghost image and verified by the star observation test, and the results showed that after adding the optical cut-off film, the average gray value of the ghost image region of the search camera is reduced from 78 (@8bit)to 64, the energy is reduced by 17.95%, and the gray difference between the ghost image edge and the center is reduced from 22 to 13, which can effectively prevent the ghost image region from being extracted by mistake.
HU Xiong-chao
,
SONG Qing-zheng
,
MA Ying-chao
,
ZHENG Xun-jiang
,
YANG Xiao
. Ghost Suppression and Experimental Verification of Large Field Space Target Search Camera[J]. Journal of Space Science and Experiment, 2023
, 23(3)
: 29
-35
.
DOI: 10.19963/j.cnki.2096-4099.2023.03.003
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