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Proceedings Paper

Hypersonic wind tunnel measurements of optical signal distortion due to propagation through cooled-window mixing layers
Author(s): Robert A. Willett; James Xerikos; Jack J. Grossman
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Paper 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.

Paper Details

Date Published: 2 December 1993
PDF: 13 pages
Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); doi: 10.1117/12.163695
Show Author Affiliations
Robert A. Willett, McDonnell Douglas Aerospace Co. (United States)
James Xerikos, McDonnell Douglas Aerospace Co. (United States)
Jack J. Grossman, McDonnell Douglas Aerospace Co. (United States)

Published in SPIE Proceedings Vol. 2005:
Optical Diagnostics in Fluid and Thermal Flow
Soyoung Stephen Cha; James D. Trolinger, Editor(s)

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