High-energy laser-assisted imaging through vaporizing aerosols

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The degradation of image quality due to multiple scattering in a turbid medium is analyzed various conditions of illumination. The emphasis is on the forward-peaked multiple scattering effects, which can adequately be described by the small-angle approximation. In the case of incoherent illumination, the modulation transfer function (MTF) can be given explicity both in the low- and high-frequency limits. For scattering with smaller degree of anisotropy, the MTF should be imputed numerically by considering numerical by considering solutions to the equation of radiative transfer with a line or point source. As the beam power increases, the turbid medium becomes modified ... continued below

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Pages: 13

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Zardecki, A. & Gerstl, S.A.W. February 1, 1988.

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Description

The degradation of image quality due to multiple scattering in a turbid medium is analyzed various conditions of illumination. The emphasis is on the forward-peaked multiple scattering effects, which can adequately be described by the small-angle approximation. In the case of incoherent illumination, the modulation transfer function (MTF) can be given explicity both in the low- and high-frequency limits. For scattering with smaller degree of anisotropy, the MTF should be imputed numerically by considering numerical by considering solutions to the equation of radiative transfer with a line or point source. As the beam power increases, the turbid medium becomes modified by its interactions with the beam, thus affecting the image resolution. In this nonlinear transport regime (flux levels of the order of 10/sup 6/ Wcm/sup 2/ and higher) the propagation leads actually to beam narrowing. In the context of the imaging problem, an apparent paradosical situation in which the image of a point source narrows down as the high-energy laser (HEL) beam propagates is discussed. 14 refs., 12 figs

Physical Description

Pages: 13

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  • SPIE's technical symposium on optics, electro-optic and sensors, Orlando, FL, USA, 4 Apr 1988

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  • Other: DE88007911
  • Report No.: LA-UR-88-669
  • Report No.: CONF-880462-6
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5228947
  • Archival Resource Key: ark:/67531/metadc1074230

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Office of Scientific & Technical Information Technical Reports

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  • February 1, 1988

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  • Feb. 4, 2018, 10:51 a.m.

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  • May 31, 2018, 12:50 p.m.

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Zardecki, A. & Gerstl, S.A.W. High-energy laser-assisted imaging through vaporizing aerosols, article, February 1, 1988; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1074230/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.