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Proceedings Paper

Experimental measurement of a time-varying optical path difference using the small-aperture beam technique
Author(s): Ronald J. Hugo; Eric J. Jumper
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Paper Abstract

This paper discusses the use of time series of the jitter angle of multiple, small-aperture probe beams as they emerge from a turbulent, optically-active flow field to quantify the time-varying optical path difference (OPD). Techniques to reconstruct a complete time series of instantaneous realizations of the OPD are first applied to a numerically-generated flow field and then to an experimental flow field. The flow field studied was that for the transitionally- turbulent region of a heated, two-dimensional jet. From these OPD histories spatial and temporal frequencies characterizing the OPD's are extracted. The relevance of these results to adaptive-optic devices is discussed.

Paper Details

Date Published: 2 December 1993
PDF: 13 pages
Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); doi: 10.1117/12.163696
Show Author Affiliations
Ronald J. Hugo, Univ. of Notre Dame (United States)
Eric J. Jumper, Univ. of Notre Dame (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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