Abstract
The space–time variations of aberrated optical images formed by propagating an incoherent light source through a nearly homogeneous, isotropic, strongly heated air turbulence generated in the laboratory have been studied using high speed cinematography and one-dimensional sampling of the exposed film transparency. The relative amplitude of image intensity fluctuations at high spatial frequencies is found to increase with decreasing exposure time and also with increasing amplitude of the refractive index fluctuations at a fixed turbulence velocity and spectral distribution. In the range of refractive index fluctuation amplitude accessible to the wind tunnel, the photographic correlation time is barely resolvable at the highest framing rate. The observed time scale is found to be of the same order of magnitude as, but noticeable shorter than, the convective dephasing time deducible from wave propagation theories using previously measured properties of the turbulence field and an extended application of Taylor’s hypothesis.
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