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

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Abstract

We discuss the use of time series of the jitter angle of multiple, small-aperture probe beams (the small-aperture beam technique, or SABT) as they emerge from a turbulent, optically active flow-field to quantify the time-varying optical path difference (OPD). The flow field studied is that for the transitionally turbulent region of a two-dimensional heated jet. Techniques to construct 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 SABT sensor’s measurement accuracy is assessed, and its application to flow fields that differ from the numerical heated jet is discussed.

© 1996 Optical Society of America

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