Calculation of diffraction by a multi-vane baffle based on boundary wave diffraction theory

Tianyi Zhang; Tianyu Gao; Dong Wang; Chengqiang Jiang; Wei Wang

doi:10.1117/12.3034262

26 July 2024 Calculation of diffraction by a multi-vane baffle based on boundary wave diffraction theory

Tianyi Zhang, Tianyu Gao, Dong Wang, Chengqiang Jiang, Wei Wang

Author Affiliations +

Proceedings Volume 13189, Second Conference on Space, Atmosphere, Marine, and Environmental Optics (SAME 2024); 1318911 (2024) https://doi.org/10.1117/12.3034262
Event: Second Conference on Space, Atmosphere, Marine, and Environmental Optics (SAME 2024), 2024, Hangzhou, China

Abstract

Baffles with multi-vane structure are most commonly used in heliospheric imaging instruments to attenuate the sunlight. In former works, a semi-empirical model based on Fresnel integral was employed to evaluate the attenuation factor while neglecting the non-uniform field on the subsequent vane planes. In this paper, we for the first time proposed a rigorous theoretical analysis on the diffraction effects of multi-vane baffle system, based on the uniform boundary wave diffraction theory. We proved analytically that the Fresnel integral is a paraxial approximation of boundary diffraction and it has sufficient accuracy in engineering usage. We analyze the diffraction effect of non-uniform fields caused by the previous vane diffraction and express it as the gradient diffraction term. It is proved numerically that this term is much smaller than the boundary diffraction term and can be neglected in engineering case.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Tianyi Zhang, Tianyu Gao, Dong Wang, Chengqiang Jiang, and Wei Wang "Calculation of diffraction by a multi-vane baffle based on boundary wave diffraction theory", Proc. SPIE 13189, Second Conference on Space, Atmosphere, Marine, and Environmental Optics (SAME 2024), 1318911 (26 July 2024); https://doi.org/10.1117/12.3034262

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KEYWORDS

Diffraction

Baffles

Shadows

Design

Engineering

Paraxial approximations

Equipment

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