Short-exposure imaging of coherently illuminated objects in turbulence

Viktor A. Banakh; Chen Ben-Nam

doi:10.1117/12.211952

15 June 1995 Short-exposure imaging of coherently illuminated objects in turbulence

Viktor A. Banakh, Chen Ben-Nam

Proceedings Volume 2471, Atmospheric Propagation and Remote Sensing IV; (1995) https://doi.org/10.1117/12.211952
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

The effect of correlation of opposing waves (one of them is incident on the viewed object and the other is reflected from it) on short-exposure imaging in turbulence is investigated theoretically. The case of strong optical turbulence is considered. As a result it is shown that the spatial spectrum of the mean of intensity in the image of coherently illuminated in a turbulent atmosphere object is presented in a form of two terms. The first term describes the short-exposure image of an incoherently illuminated object, and the other owes its origin to correlation of the opposing waves. This term contains the spectral components of the high- frequency part of spatial spectrum of the object, filtered by inhomogeneous medium in the absence of counter wave correlation. Both incoherent term of the spatial spectrum of short- exposure image and coherent one cover the more high-frequency range than in the case of long-exposure image. The behavior of quality of short-exposure coherent images as compared to long-exposure ones is estimated.

Citation Download Citation

Viktor A. Banakh and Chen Ben-Nam "Short-exposure imaging of coherently illuminated objects in turbulence", Proc. SPIE 2471, Atmospheric Propagation and Remote Sensing IV, (15 June 1995); https://doi.org/10.1117/12.211952

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