title: Comprehensive analysis of imaging quality degradation of an airborne optical system for aerodynamic flow field around the optical window.
abstract: We investigated the influences exerted by the nonuniform aerodynamic flow field surrounding the optical window on the imaging quality degradation of an airborne optical system. The density distribution of flow fields around three typical optical windows, including a spherical window, an ellipsoidal window, and a paraboloidal window, were calculated by adopting the Reynolds-averaged Navier-Stokes equations with the Spalart-Allmaras model provided by FLUENT. The fourth-order Runge-Kutta algorithm based ray-tracing program was used to simulate the optical transmission through the aerodynamic flow field. Four kinds of imaging quality evaluation parameters were presented: wave aberration of the entrance pupil, point spread function, encircled energy, and modulation transfer function. The results show that the imaging quality of the airborne optical system was affected by the shape of the optical window and angle of attack of the aircraft.
authors: Chenglong
authors: C
authors: Hao
authors: Shouqian
authors: S
authors: Chen
authors: Wang
authors: W
authors: Zhang
authors: Jinhan
authors: J
authors: Ren
authors: Chong
authors: C
authors: Li
authors: Hongjun
authors: H
authors: Pang
authors: Honghao
authors: H
authors: Wang
authors: Qian
authors: Q
authors: Liu
authors: Chao
authors: C
authors: Wang
authors: Huiying
authors: H
authors: Zou
authors: Zhigang
authors: Z
authors: Fan