Interferometric measurements of a high-velocity mixing/shear layer

Bruce R. Peters; David A. Kalin

doi:10.1117/12.45783

1 July 1991 Interferometric measurements of a high-velocity mixing/shear layer

Bruce R. Peters, David A. Kalin

Author Affiliations +

Proceedings Volume 1486, Characterization, Propagation, and Simulation of Sources and Backgrounds; (1991) https://doi.org/10.1117/12.45783
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

An investigation has been undertaken which utilizes nonintrusive optical interferometric techniques to visualize the turbulent structure found in a high-velocity flow field and thereby characterize the resulting optical distortion. Experiments were conducted on a 7.68 mm by 7.68 mm cross section of a high velocity, dual gas, mixing/shear layer, and the preliminary results are presented. The experimental apparatus consisted of a dual beam Mach-Zehnder interferometer with a customized high-speed CCD camera data acquisition system. A series of time varying images of the gas flow were captured and digitized with the interferometer configured in both a finite and an infinite fringe mode. By correlating the initial tare run wavefront (gas off condition) to any subsequent distorted wavefront (gas on condition), the turbulent flow field structure and the relative phase shift across the test region was analyzed. Both classical and nonclassical approaches were taken in analyzing the interferometric data to obtain an understanding of the high velocity flow field. In addition, the experimental results were compared to theoretical predictions for RMS wavefront distortion.

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Bruce R. Peters and David A. Kalin "Interferometric measurements of a high-velocity mixing/shear layer", Proc. SPIE 1486, Characterization, Propagation, and Simulation of Sources and Backgrounds, (1 July 1991); https://doi.org/10.1117/12.45783

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KEYWORDS

Interferometry

Adaptive optics

Wavefront distortions

Interferometers

CCD cameras

Fringe analysis

Turbulence

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