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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 51, Iss. 12 — Apr. 20, 2012
  • pp: 1836–1842

Backscatter signatures of biological aerosols in the infrared

Evan Thrush, Nicolas Salciccioli, David M. Brown, Karen Siegrist, Andrea M. Brown, Michael E. Thomas, Nathan Boggs, and Christopher C. Carter  »View Author Affiliations


Applied Optics, Vol. 51, Issue 12, pp. 1836-1842 (2012)
http://dx.doi.org/10.1364/AO.51.001836


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Abstract

To develop a deeper understanding of the optical signatures of both biological aerosols and potential interferents, we made field measurements of optical cross sections and compared them to model-based predictions. We measured aerosol cross sections by conducting a hard-target calibration of a light detection and ranging system (LIDAR) based on the Frequency Agile Laser (FAL). The elastic backscatter cross sections are estimated at 19 long-wave infrared (LWIR) wavelengths spanning the range from 9.23 to 10.696 μm. The theoretical modeling of the elastic backscatter cross sections is based on the measured refractive index and size distribution of the aerosols, which are used as inputs into Mie calculations. Both model calculations and experimental measurements show good agreement and also indicate the presence of spectral features based on single particle absorption in the backscatter cross sections that can be used as a basis for discrimination for both standoff and point sensors.

© 2012 Optical Society of America

OCIS Codes
(280.1100) Remote sensing and sensors : Aerosol detection
(280.3640) Remote sensing and sensors : Lidar
(280.1415) Remote sensing and sensors : Biological sensing and sensors

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: June 16, 2011
Revised Manuscript: August 22, 2011
Manuscript Accepted: September 8, 2011
Published: April 11, 2012

Virtual Issues
Vol. 7, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Evan Thrush, Nicolas Salciccioli, David M. Brown, Karen Siegrist, Andrea M. Brown, Michael E. Thomas, Nathan Boggs, and Christopher C. Carter, "Backscatter signatures of biological aerosols in the infrared," Appl. Opt. 51, 1836-1842 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-12-1836

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