Information content of an imaging system in atmospheric turbulence

Yixin Zhang

doi:10.1117/12.177685

8 June 1994 Information content of an imaging system in atmospheric turbulence

Yixin Zhang

Proceedings Volume 2120, Laser Beam Propagation and Control; (1994) https://doi.org/10.1117/12.177685
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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 N_d 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 < a_t ,the N_d is independent on the atmospheric turbulence. For the particuar cases of incoherent illumination, N_d 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.

Citation Download Citation

Yixin Zhang "Information content of an imaging system in atmospheric turbulence", Proc. SPIE 2120, Laser Beam Propagation and Control, (8 June 1994); https://doi.org/10.1117/12.177685

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