Effects of aerosol forward-scatter of infrared and visible light on atmospheric coherence diameter: theory and validation

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Abstract

A correction to the definition of the atmospheric coherence diameter is suggested here. The basis of this new approach is the existence of an aerosol modulation transfer function (MTF) which is often the dominant ingredient of the atmospheric MTF. As defined by Fried about 25 years ago, atmospheric MTF was related to turbulence MTF only. In the case of a Gaussian approximation of the aerosol MTF, an analytical expression is derived for the aerosol-derived coherence diameter. This parameter is related to the aerosol MTF's cutoff frequency, and to its asymptote at high spatial frequencies. Qualitative validation of the theory is presented, based on measured MTFs in the open atmosphere. Overall atmospheric coherence diameter is generally the smaller between the turbulence and aerosol coherence diameters. The results here appear applicable particularly to cost-effective thermal imaging system design, although applications are considered too for the visible and near infrared.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherPubl by Society of Photo-Optical Instrumentation Engineers
Pages24-34
Number of pages11
ISBN (Print)0819412104, 9780819412102
DOIs
StatePublished - 1 Jan 1993
Event8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing - Tel Aviv, Isr
Duration: 14 Dec 199216 Dec 1992

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume1971
ISSN (Print)0277-786X

Conference

Conference8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing
CityTel Aviv, Isr
Period14/12/9216/12/92

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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