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23 September 1997 Image content for imaging after double passage through a turbulent medium
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The double-passage effects of atmospheric turbulence on the imaging quality and resolution of an optical system , illuminated by the incoherent light ,are discussed in terms of the information content and the nUmber Nd of degrees of freedom of an imaging system. The Van Cittent-Zernike theorem and the Karhunen-Loe've expasion of generalized prolate -spheroidal function for the mutual intensity of stochastic waves is used to calaulate the turbulent average mutual intensity f12 for light from an extended incoherent quasi -monochromatic source and double-passage propagation in weak atmospheric turbulence. It is shown that , for incoherent illumination system and the receiving aperture is larger than the radius A of backscattered beam ,the turbulent spread of the beam may lead a positive effect , and there is a potential supperresolution , the resolution beyond the classical diffraction limit.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yixin Zhang, Tuo Zhu, Xiaowu Ni, and Linghua Chen "Image content for imaging after double passage through a turbulent medium", Proc. SPIE 3125, Propagation and Imaging through the Atmosphere, (23 September 1997);

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