Effect of Sapphire Window Temperature on Infrared Imaging under Aerodynamic Heating

FU Xiaowu; SHI Mingdong; MAO Rui

doi:10.15892/j.cnki.djzdxb.2025.03.004

Journal of Projectiles, Rockets, Missiles and Guidance >

2025 , Vol. 45 >Issue 3: 295 - 302

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2025.03.004

Effect of Sapphire Window Temperature on Infrared Imaging under Aerodynamic Heating

FU Xiaowu ^,¹^,² ,
SHI Mingdong ³ ,
MAO Rui ¹^,²

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¹ National Key Laboratory of Land and Air Based Information Perception and Control,Xi'an 710065,Shaanxi,China
² Xi'an Modern Control Technology Research Institute,Xi'an 710065,Shaanxi,China
³ Xi'an Guidance Technology Co.,Ltd.,Xi'an 710065,Shaanxi,China

Received date: 2025-02-27

Online published: 2025-07-09

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Abstract

In view of the problem that the infrared imaging for terminal guidance of rockets is affected by aerodynamic heating, the temperature response of the sapphire infraredwindow structure caused by aerodynamic heating is obtained through numerical simulation. On this basis, a wind tunnel test is designed to study the effect of aerodynamic heating on the infrared imaging of the seeker. In the numerical simulation, the aerodynamic heating of the infrared dome along the ballistic trajectory is obtained by combining computational fluid dynamics and engineering algorithms, and the temperature response of the dome structure is obtained by the finite element method. In the wind tunnel test, measuring points are installed on the inner surface of the dome to obtain the temperature response of the dome structure under aerodynamic heating, and the imaging effect of the infrared seeker under aerodynamic heating is tested. The research results show that, under aerodynamic heating, the highestinner wall temperature of the dome is 148 ℃, which is much higher than the target temperature of 27 ℃. Based on the sapphire window temperature, it needs to reduce the integration time of the infrared detector and adjust imaging algorithmto perform image correction.

Key words： aerodynamic heating; temperature response; wind tunnel test; infrared imaging

Cite this article

FU Xiaowu , SHI Mingdong , MAO Rui . Effect of Sapphire Window Temperature on Infrared Imaging under Aerodynamic Heating[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(3) : 295 -302 . DOI: 10.15892/j.cnki.djzdxb.2025.03.004

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