Design of hybrid refractive-diffractive star sensor optical system with wide field and small F-number

Zehua Ma; Hu Wang; Yang Shen; Yaoke Xue; Haoyu Yan

doi:10.1117/12.2606601

24 November 2021 Design of hybrid refractive-diffractive star sensor optical system with wide field and small F-number

Zehua Ma, Hu Wang, Yang Shen, Yaoke Xue, Haoyu Yan

Author Affiliations +

Proceedings Volume 12069, AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations; 120690W (2021) https://doi.org/10.1117/12.2606601
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

In order to improve the measurement accuracy and detection ability of the star sensor, this paper uses a double Gauss structure with conic aspheric surface and hybrid refractive-diffractive to design an optical system with large field of view of 25°and large relative aperture of 1/1.156, and only 6 lenses are used. First, According to the selected CMOS APS sensor performance parameters, the entrance pupil diameter, field of view, focal length and wavelength range are determined. The field of view is 25°, F number is 1.156, focal length is 52mm, entrance pupil diameter is 45mm, the wavelength range is 500-800nm. The detection of 6 magnitude stars is realized, the probability of capturing 5 navigation stars is 100%, and autonomous navigation recognition is realized. Then, the glass material selection and structure optimization of the optical system are conducted, the optical system is optimized by introducing two conic aspheric surfaces and a diffractive surface. Finally, the influence of the diffraction efficiency of the diffractive optical element on the signal-to-noise ratio is analyzed. After analysis of image quality, the shape of diffuse spot in each field of view is approximately circular, the energy is close to Gaussian distribution, more than 90% of the energy is concentrated in 3×3 pixels, lateral color is less than 1.06μm, and relative distortion is less than 0.87%. The optical system only uses six lenses, the imaging quality meets the imaging requirements of the star sensor, and is beneficial to improve the accuracy and detection capability of the star sensor.

Citation Download Citation

Zehua Ma, Hu Wang, Yang Shen, Yaoke Xue, and Haoyu Yan "Design of hybrid refractive-diffractive star sensor optical system with wide field and small F-number", Proc. SPIE 12069, AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations, 120690W (24 November 2021); https://doi.org/10.1117/12.2606601

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KEYWORDS

Stars

Signal to noise ratio

Star sensors

Diffraction

Optical design

Sensors

Aspheric lenses

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