Influence of aerodynamic optics on the imaging quality degradation of an high-speed aircraft

Hui Wang; Shouqian Chen; Rongda Zhang; Yue Ming; Lin Ju; Baofeng Cao; Xiaotian Shi; Zhigang Fan

doi:10.1117/12.2505444

12 December 2018 Influence of aerodynamic optics on the imaging quality degradation of an high-speed aircraft

Hui Wang, Shouqian Chen, Rongda Zhang, Yue Ming, Lin Ju, Baofeng Cao, Xiaotian Shi, Zhigang Fan

Proceedings Volume 10846, Optical Sensing and Imaging Technologies and Applications; 108462D (2018) https://doi.org/10.1117/12.2505444
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China

Abstract

When the aircraft is flying at high speed in the atmosphere, the incoming flow is blocked in the front section of the dome, which causing the shape of the optical dome and the refractive index to change due to aerodynamic heating effect.These changes cause the beam from the target to generate additional phase after passing through the dome, causing the target image to shift, jitter, and blur. The aero-optical transmission effect affects the imaging quality of the target，meanwhile the high-temperature dome generates thermal radiation, thus generates radiation noise, and reduces the signal-to-noise ratio of the detector.In order to study the comprehensive impact of aero-optical effects (including the aero-optical transmission effect and the aerodynamic thermal radiation effect) on the imaging quality of high-speed aircraft,the temperature field distribution and deformation field distribution of the dome are obtained by the thermal analysis of the dome.The fourth-order Runge-Kutta method is used to trace beam from the target and the dome's own radiation beam.The point spread function, MTF curve of the target image formed on the detector and the irradiance distribution on the detector were obtained through simulation calculation, and the target distorted image was obtained under affecting by the aero-optical transmission effect and the aerodynamic thermal radiation effect .Research indicates that when the aircraft is flying at high speed, the imaging quality of the high-speed aircraft optical system is seriously degraded under the influence of the aero-optical transmission effect and the aerodynamic thermal radiation effect, hence the aero-optical effect cannot be ignored.

Citation Download Citation

Hui Wang, Shouqian Chen, Rongda Zhang, Yue Ming, Lin Ju, Baofeng Cao, Xiaotian Shi, and Zhigang Fan "Influence of aerodynamic optics on the imaging quality degradation of an high-speed aircraft", Proc. SPIE 10846, Optical Sensing and Imaging Technologies and Applications, 108462D (12 December 2018); https://doi.org/10.1117/12.2505444

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KEYWORDS

Domes

Image transmission

Aerodynamics

Radiation effects

Distortion

Target detection

Thermal effects

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