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Updated: Aug 24, 2026

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
Published on: March 12, 2019
Comparison of measurements of the outer scale of turbulence by three different techniques
Aziz Ziad1, Matthias Schöck, Gary A Chanan
1Unité Mixte de Recherche 6525 Astrophysique, Université de Nice-Sophia Antipolis, Parc Valrose, 06108 Nice 2, France. aziz.ZIAD@unice.fr
Abstract:
We have made simultaneous and nearly simultaneous measurements of L0, the outer scale of turbulence, at the Palomar Observatory by using three techniques: angle-of-arrival covariance measurements with the Generalized Seeing Monitor (GSM), differential-image-motion measurements with the adaptive-optics system on the Hale 5-m telescope, and fringe speed measurements with the Palomar Testbed Interferometer (PTI). The three techniques give consistent results, an outer scale of approximately 10-20 m, despite the fact that the spatial scales of the three instruments vary from 1 m for the GSM to 100 m for the PTI.
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