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Keywords = large entrance pupil diameter

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14 pages, 5074 KiB  
Article
Catadioptric Optical System Design of 15-Magnitude Star Sensor with Large Entrance Pupil Diameter
by Yang Bai, Jianlin Li, Rongwei Zha, Ying Wang and Guangzhi Lei
Sensors 2020, 20(19), 5501; https://doi.org/10.3390/s20195501 - 25 Sep 2020
Cited by 9 | Viewed by 3188
Abstract
The optical system is one of the core components for star sensors, whose imaging quality directly influences the performance of star sensors for star detection, thereby determining the attitude control accuracy of spacecrafts. Here, we report a new type of optical system with [...] Read more.
The optical system is one of the core components for star sensors, whose imaging quality directly influences the performance of star sensors for star detection, thereby determining the attitude control accuracy of spacecrafts. Here, we report a new type of optical system with a catadioptric structure and a large entrance pupil diameter for a 15-magnitude star sensor. It consists of an improved Cassegrain system (R-C system), an aperture correction spherical lens group and a field of view correction spherical lens group. By embedding the secondary mirror of the R-C system into the output surface of the negative spherical lens of the aperture correction spherical lens group, the blocking of incident light is eliminated from the secondary mirror holder. After the structure optimization, the catadioptric optical system (COS) had a spectral range of 450 nm–950 nm, an entrance pupil diameter of 250 mm, a half-diagonal field of view of 1.4° and a focal length of 390 mm. By using theoretical calculations and experimental measurements, it was verified that the COS, with the ability to correct astigmatism, lateral color and distortion, can fulfill the detection of 15-magnitude dark stars. Full article
(This article belongs to the Section Optical Sensors)
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