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7 July 1998 Calculating models of cooling IR window and window background radiation
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During the intercept flying of endo-atmospheric hypersonic vehicles, an Infra-Red (IR) sensor may be used to detect, acquire, and track the target. This sensor views its target through an IR window on side of vehicle' head cone. The aero-thermal will make window high temperature. To provide adequate performance of the sensor, the window must be cooled to maintain temperature low and to reduce the sensor's background noise and refraction errors. This report includes four parts. The first part introduces the outline of calculating the temperature distribution of the window and background radiation surround the window; the second part describes `equivalent cone' method to calculate the aero-thermal flow in IR window; the third part introduces the engineering model to calculate the efficient of cooling window, including the temperature distribution of window cooled, etc.; the fourth part describes the window background radiation and the S/N calculating model of IR sensor. Main aforesaid engineering methods and models have been verified by wind tunnel test. The calculating results are very important to design IR cooled window and sensor in supersonic vehicle.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ziming Wan "Calculating models of cooling IR window and window background radiation", Proc. SPIE 3375, Targets and Backgrounds: Characterization and Representation IV, (7 July 1998);

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