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24 November 2021 Simulation research on aerodynamic heat radiation of dome in complicated thermal environment
Lei Gao, Huan Li, Shuang Wang, Mingna Liu
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Proceedings Volume 12065, AOPC 2021: Optical Sensing and Imaging Technology; 120652A (2021) https://doi.org/10.1117/12.2606356
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China
Abstract
When infrared imaging-guided aircraft is flying at high speed, the optical dome is heated strongly aerodynamically and generates infrared radiation, which forms background noise on detector, which reduces target detection performance.In order to research the influence of the continuous high dynamic change of temperature of the dome on infrared imaging, the fluid thermal solid coupling calculation model of the dome under the trajectory is established, and the time-varying non-uniform temperature field of the dome is obtained. The aerodynamic thermal radiation distribution on the detector is obtained by ray tracing, and a simple method of solid angle discretization is proposed for reference.The results show that the temperature of the dome reaches the maximum value of 417.6 K at the end of flight, and the irradiance of the image plane reaches the maximum value of 0.8791W/m2. The signal-to-noise ratio(SNR) and contrast gradually decrease with the flight time. When the target is located in the background gray-scale slope area, the SNR drops the most that drops by 66.77% compared with the reference image without aerodynamic heating at the end of flight. Contrast decline is basically independent of the location of the target, and the end time drops by 93.42%. The simulation method of aerodynamic thermal radiation and the evaluation method of degraded image quality proposed in this paper have a certain reference significance, which lays a foundation for the optimization of response wave band of infrared detection system and the suppression of aerodynamic thermal.
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Lei Gao, Huan Li, Shuang Wang, and Mingna Liu "Simulation research on aerodynamic heat radiation of dome in complicated thermal environment", Proc. SPIE 12065, AOPC 2021: Optical Sensing and Imaging Technology, 120652A (24 November 2021); https://doi.org/10.1117/12.2606356
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KEYWORDS
Domes
Aerodynamics
Signal to noise ratio
Radiation effects
Image quality
Imaging systems
Ray tracing
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