Abstract

A planar heated air jet was constructed. Its flow properties were characterized and shown to be both reproducible and in good agreement with the results of turbulence theory. The optical properties of the jet were studied with the help of a 632.8-nm He–Ne laser beam. The random phase modulations imposed on the wave front of the beam traversing the jet were measured by interferometric means, and their spectra and variance were determined. The one-dimensional phase fluctuation spectrum obeyed a −8/3 power law as predicted by theory, whereas the phase variance 〈ϕ2〉 depended on the jet temperature and was studied for values to as high as 0.4 (rad)2.

© 1995 Optical Society of America

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