2 December 1993 Hypersonic wind tunnel measurements of optical signal distortion due to propagation through cooled-window mixing layers
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Abstract
Optical refraction in high enthalpy hypersonic flow fields can adversely affect infrared imaging of targets by an optical sensor looking through the flow field from an interceptor. In perhaps one of the most complex aero-optical wind tunnel tests ever attempted, measurements of image blur, Strehl ratios, jitter, and boresight error were made on sensor image data for cases of optical propagation of a collimated beam through the hypersonic flow field over an interceptor forebody in a wind tunnel. Determination of the dependence of the aero-optical effects on coolant gas flow rates for both the forebody and the window was sought. Holographic and other types of optical measurements were made in addition to measurements on images. Analysis of the data required various types of processing in order to obtain the desired information in the presence of equipment vibration, optical system aberrations, and nonlinear focal-plane array response.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert A. Willett, James Xerikos, Jack J. Grossman, "Hypersonic wind tunnel measurements of optical signal distortion due to propagation through cooled-window mixing layers", Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); doi: 10.1117/12.163695; https://doi.org/10.1117/12.163695
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