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Related Experiment Videos

Atmospheric modulation transfer function in the infrared.

Kobi Buskila1, Shay Towito, Elad Shmuel

  • 1Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.

Applied Optics
|January 23, 2004
PubMed
Summary

Atmospheric conditions, not equipment, degrade thermal imager quality over distance. Aerosol and turbulence effects vary with path elevation and wavelength, impacting infrared imaging system design.

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Area of Science:

  • Optical Engineering
  • Atmospheric Optics
  • Infrared Technology

Background:

  • Image quality in thermal imagers is often limited by atmospheric effects.
  • Atmospheric blur, scattering, absorption, and turbulence significantly impact long-path infrared imaging.

Purpose of the Study:

  • To analyze atmospheric degradation effects on high-resolution thermal imager performance.
  • To compare atmospheric limitations versus instrumentation limitations in infrared imaging.

Main Methods:

  • Conducted experiments using high-resolution thermal imagers in 3-5- and 8-13-micrometer bands.
  • Collected infrared image data at two distinct field sites (Fort A. P. Hill and Aberdeen Proving Ground).
  • Analyzed the influence of scattering, absorption, and turbulence on image quality.

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Main Results:

  • Atmospheric conditions, rather than instrumentation, were the primary limiters of image quality, even at ranges of a few kilometers.
  • Turbulence dominated image degradation for low-elevation paths, while aerosol modulation transfer function (MTF) was dominant for higher paths.
  • Increased wavelength enhanced turbulence MTF but absorption significantly reduced aerosol MTF in the thermal infrared.

Conclusions:

  • Atmospheric MTF is a critical factor in the design and analysis of infrared imaging systems.
  • Understanding atmospheric phenomena is essential for optimizing thermal imager performance, especially with advancing hardware.
  • Absorption plays a key role in limiting aerosol MTF in the thermal infrared spectrum.