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Atmospheric Turbulence

Atmospheric Turbulence. Atmospheric Turbulence. The atmosphere is an inhomegeneous medium with varying index of refraction in both time and space. thermal gradients humidity gradients bulk wind shear Seeing is the apparent random fluctuation in size and position of a point spread function.

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Atmospheric Turbulence

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  1. Atmospheric Turbulence www.assignmentpoint.com

  2. Atmospheric Turbulence • The atmosphere is an inhomegeneous medium with varying index of refraction in both time and space. • thermal gradients • humidity gradients • bulk wind shear • Seeing is the apparent random fluctuation in size and position of a point spread function. • Scintillation is the apparent random fluctuation in the intensity, i.e. “twinkling.” seeing aberration unaberrated www.assignmentpoint.com

  3. Atmospheric Turbulence: Wavefront Maps www.assignmentpoint.com

  4. Atmospheric Turbulence: Wavefront Maps www.assignmentpoint.com

  5. Atmospheric Turbulence: Wavefront Maps www.assignmentpoint.com

  6. Atmospheric Turbulence: Wavefront Maps www.assignmentpoint.com

  7. Atmospheric Turbulence: Wavefront Maps www.assignmentpoint.com

  8. Atmospheric Turbulence: Wavefront Maps www.assignmentpoint.com

  9. Atmospheric Turbulence: Seeing • Seeing is worse at low elevations because light traverses more turbulent atmospheric cells. Most seeing degradation is generated at the interfaces between air of different temperatures. • Scintillation is worse at low elevations for the same reason, thus twinkling stars on the horizon. different curves represent different optical configurations (and different induced optical image smear) www.assignmentpoint.com

  10. Atmospheric Turbulence: Seeing Video www.assignmentpoint.com

  11. Atmospheric Turbulence: Adaptive Optics www.assignmentpoint.com

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