Experimental measurement of a time-varying optical path difference using the small-aperture beam technique

Ronald J. Hugo; Eric J. Jumper

doi:10.1117/12.163696

2 December 1993 Experimental measurement of a time-varying optical path difference using the small-aperture beam technique

Ronald J. Hugo, Eric J. Jumper

Author Affiliations +

Proceedings Volume 2005, Optical Diagnostics in Fluid and Thermal Flow; (1993) https://doi.org/10.1117/12.163696
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

Citation Download Citation

Ronald J. Hugo and Eric J. Jumper "Experimental measurement of a time-varying optical path difference using the small-aperture beam technique", Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); https://doi.org/10.1117/12.163696

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