Design of Star Sensor Optical Lens with Large Aperture and Long Focal Length

In order to improve the ability of star sensors to detect the limit magnitude,a complex double-Gaussian structure optical lens is designed through selection of models and parameter calculation in this paper. After optimized by ZEMAX software,a refraction optical lens without vareing composed of 12 spherical lenses is finally obtained. The lens has an entry pupil diameter of 125 mm,a system focal length of 200 mm,a full field angle 2ω of 14. 84°,and a spectrum range of 500-800 nm. The design results at a temperature of 20 ℃ show that the root mean square dispersion spot radius is less than 3. 5,the full field optical design modulation transfer function(MTF)is more than 0. 7 at 60 lp/mm,the energy concentration in 3×3 pixels is more than 90%,the distortion is less than 1%,and the maximum magnification chromatic aberration is 1. 6. After processing and adjustment,the lowest laboratory static MTF of the measured optical system at 60 lp/mm is 0. 324.

A large aperture and long focal length optical lens has been designed for practical engineering needs. The lens has an inlet pupil diameter of 125 mm, a focal length of 200 mm, and a full field angle of 2 ω It is 14.84 ° and has a spectral range of 500-800 nm. Using a symmetrical complex double Gaussian objective lens with an aperture as the initial structure, selecting a combination of positive and negative lenses and achromatic glass material, and optimizing the structure of the initial optical lens with mechanical passive optical compensation. The design results at a temperature of 20 ℃ indicate that the RMS dispersion spot radius of the optical system is less than 3.5 μ m. The MTF of the full field optical design is greater than 0.7 at a spatial frequency of 60 lp/mm, and the minimum laboratory static MTF of the measured optical system is 0.324 (at 60 lp/mm), at 3 × The energy concentration within 3 pixels is greater than 90%. The lens chromatic aberration has been well corrected, with a maximum magnification chromatic aberration of 1.6 μ m. The distortion is less than 1%, and the imaging quality of each field of view of the optical system meets the design specifications. The design of 12 global non adhesive tight lenses solves the problems of high processing difficulty and assembly difficulty in optical systems; The use of domestically produced glass materials is easy to mass produce, which is of great significance for the design of large aperture, high energy, and high-resolution lenses required in the field of space remote sensing.