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Proceedings Paper

Extension of the small-aperture beam technique to the measurement of full two-dimensional optical wavefronts
Author(s): Edward J. Fitzgerald; Eric J. Jumper
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Paper Abstract

Variable-density flows create time- and space-varying aberrations in optical wavefronts passing through them. Such aberrations significantly degrade the performance of instruments using this optical 'information'. Since fluid turbulence causes the distortions,they also contain information about the flow that created them. A high speed, optical wavefront sensor would thus be useful both as a means of cuing adaptive-optics systems and for non- intrusive, turbulent flow diagnostics. This paper presents the first effort to develop a high speed, 2D wavefront sensor based on the theory for the 1D, small-aperture beam technique (SABT). The new sensor uses the SABT for measurements in the streamwise direction and scanned beams for cross-stream wavefront measurements. Results of a breadboard implementation of the cross-stream component are presented followed by preliminary result for the full, 2D, SABT-derivative sensor measurements of a low-speed, heated mixing layer.

Paper Details

Date Published: 21 November 1997
PDF: 12 pages
Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); doi: 10.1117/12.293388
Show Author Affiliations
Edward J. Fitzgerald, Univ. of Notre Dame (United States)
Eric J. Jumper, Univ. of Notre Dame (United States)

Published in SPIE Proceedings Vol. 3172:
Optical Technology in Fluid, Thermal, and Combustion Flow III
Soyoung Stephen Cha; James D. Trolinger; Masaaki Kawahashi, Editor(s)

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