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The longest star sensor optical system with the largest focal length in domestic was successfully developed
[China instrument network instrument research and development] For space debris observation cameras, ultra-high-precision star sensors and other devices that detect dark and weak point targets, large-diameter compact high-quality optical system is the key to achieve sub-second detection accuracy Influencing factors.
The influence of the attitude measurement accuracy on the star sensor is the visual axis drift error caused by the temperature change caused by the change of the optical performance of the lens group, the optical system focal length error, the optical axis deviation error, the focal plane tilt error, and the optical distortion correction residual error. Offset error and other low frequency errors.
The invention patent “Space sub-seconds large-aperture compact optical structure for subtle-secondary target detection†by space rooms Wang Hu, Liu Jie, Xue Yaoke et al. solves the above problems well and makes the thermal stability of the optical system. The high image quality effectively reduces the low frequency error and has recently been authorized by the invention.
The total optical length of the system is 175mm (equivalent to the aperture size) and the focal length is 320mm. It is the first optical sensor system with the largest aperture and the longest focal length in China. The system introduces a number of technologies such as athermalization, light miniaturization, and stray light suppression. Among them, the use of secondary mirrors and aperture correction mirror coplanar design concepts, and aperture correction lens in the optical circuit is applied multiple times and other special layout, shortened the total optical length, so that the system's aperture and optical total length of the equivalent; secondary mirror hood and The center of the aperture correcting mirror is connected through the through hole, which effectively reduces the influence of multiple reflections of the blind and stray light, and obtains a good stray light suppression effect. The entire optical system is of good image quality, energy concentration, small dispersion and color deviation, and small color distortion, which is conducive to the realization of sub-second detection accuracy. It is suitable for ultra-high-precision star sensors and space debris and other weak point targets. Detection.
The embodiment of the invention patent has been successfully applied to the Tianzhou I cargo ship.
(Original title: "sub-second-second large-aperture compact optical structure for target detection of dark spots" was granted by the national invention patent)