An optical technique is described that uses coherent and incoherent optical scintillation to measure the path-averaged value of the turbulence inner scale. The technique is verified by comparison with an in situ measurement, and inner scale values obtained 1.5 m above the ground over a 24-h period are shown.
Gerard R. Ochs and Reginald J. Hill, "Optical-scintillation method of measuring turbulence inner scale," Appl. Opt. 24, 2430-2432 (1985)