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Updated: Jun 24, 2025

High-speed Particle Image Velocimetry Near Surfaces
Published on: June 24, 2013
Relationship between turbulent image variance and average image gradient
Abstract:
Optical turbulence can cause substantial distortions in imaging over long horizontal paths. For Lambertian objects, these distortions are only seen where there is a gradient in the object's radiance. It is possible to establish a relationship between the intensity variance of a turbulent image and the average image's gradient squared. We test the validity of a linear relationship between these quantities using turbulent imaging data. We find that it performs reasonably well for weak and intermediate optical turbulence regimes, but that some discrepancies remain to be explained.
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