Imaging of Extended Objects Through a Turbulent Atmosphere
AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
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The extended Huygens-Fresnel principle is used to derive an explicit expression for the image plane illuminance distribution of an extended object with an arbitrary liminance emittance distribution. The combined simultaneous effects of attenuation, background luminance, and atmospheric turbulence are given. A quantitative comparison of these effects is made, and their contribution to the overall loss in resolution is given. In particular, the authors derive a quantitative expression for the point spread function of the combined atmospheric-optical system. Explicit expressions are derived for both the atmospheric-optical system modulation transfer function MTF and image plane modulation. Numerical results for the image plane modulation are presented for imaging both up and down along an atmospheric path.
- Atmospheric Physics