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Proceedings Paper

Information content of an imaging system in atmospheric turbulence
Author(s): Yixin Zhang
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Paper Abstract

The effects of atmospheric turbulence on the imaging quality and resolution of an optical system, illuminated by the coherent and noncoherent light, are discussed in terms of the information content and the number Nd of degrees of freedom of an imaging system. lt is shown that, for coherent illumination system and the receiving radius R2 is langer than the radius a of propagated beam ,the turbulent spread of the beam may lead a positive effect , and there is a potential superresolution, the resolution beyond the classical diffraction limit and for R2 < at ,the Nd is independent on the atmospheric turbulence. For the particuar cases of incoherent illumination, Nd is found to be reduced from its turbulence--free value , the Shannon number , by the factor ((alpha)r0/D0 ) 2, r0 is the Fried's parmenter , D0 is the receiving diameter and (alpha) is the function of the variable r0/D0. The information content of coherent incoherent illumination systems is decrease with the atmosphere--turbulence fluctuations increase.

Paper Details

Date Published: 8 June 1994
PDF: 9 pages
Proc. SPIE 2120, Laser Beam Propagation and Control, (8 June 1994); doi: 10.1117/12.177685
Show Author Affiliations
Yixin Zhang, Wuxi Institute of Light Industry (China)


Published in SPIE Proceedings Vol. 2120:
Laser Beam Propagation and Control
Hugo Weichel; Lewis F. DeSandre, Editor(s)

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