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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 31 — Nov. 1, 2008
  • pp: 5924–5937

Radiative transfer model for aerosols at infrared wavelengths for passive remote sensing applications: revisited

Avishai Ben-David, Charles E. Davidson, and Janon F. Embury  »View Author Affiliations

Applied Optics, Vol. 47, Issue 31, pp. 5924-5937 (2008)

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We introduced a two-dimensional radiative transfer model for aerosols in the thermal infrared [ Appl. Opt. 45, 6860–6875 (2006)]. In that paper we superimposed two orthogonal plane-parallel layers to compute the radiance due to a two-dimensional (2D) rectangular aerosol cloud. In this paper we revisit the model and correct an error in the interaction of the two layers. We derive new expressions relating to the signal content of the radiance from an aerosol cloud based on the concept of five directional thermal contrasts: four for the 2D diffuse radiance and one for direct radiance along the line of sight. The new expressions give additional insight on the radiative transfer processes within the cloud. Simulations for Bacillus subtilis var. niger (BG) bioaerosol and dustlike kaolin aerosol clouds are compared and contrasted for two geometries: an airborne sensor looking down and a ground-based sensor looking up. Simulation results suggest that aerosol cloud detection from an airborne platform may be more challenging than for a ground-based sensor and that the detection of an aerosol cloud in emission mode (negative direct thermal contrast) is not the same as the detection of an aerosol cloud in absorption mode (positive direct thermal contrast).

© 2008 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(280.1100) Remote sensing and sensors : Aerosol detection
(280.1310) Remote sensing and sensors : Atmospheric scattering
(290.1090) Scattering : Aerosol and cloud effects
(290.4210) Scattering : Multiple scattering
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Remote Sensing and Sensors

Original Manuscript: May 14, 2008
Revised Manuscript: August 21, 2008
Manuscript Accepted: August 27, 2008
Published: October 30, 2008

Virtual Issues
Vol. 4, Iss. 1 Virtual Journal for Biomedical Optics

Avishai Ben-David, Charles E. Davidson, and Janon F. Embury, "Radiative transfer model for aerosols at infrared wavelengths for passive remote sensing applications: revisited," Appl. Opt. 47, 5924-5937 (2008)

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