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Proceedings Paper

Extinction and backscatter cross sections of biological materials
Author(s): M. E. Thomas; M. B. Airola; C. C. Carter; N. T. Boggs
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Paper Abstract

Aerosol backscatter and extinction cross-sections are required to model and evaluate the performance of both active and passive detection systems. A method has been developed by which begins with laboratory measurements of thin films and suspensions of biological material to obtain the complex index refraction of the film from the UV to the LWIR. Using that result with particle size distribution and shape information as inputs to T-matrix calculations yields the extinction cross-section and backscatter cross section as a function of wavelength. These are important inputs to the lidar equation. In a continuing effort to provide validated optical cross-sections, measurements have been made on a number of high purity biological species in the laboratory as well as measurements of material released at recent field tests. The resulting observed differences aid in distinguishing between intrinsic and extrinsic effects, which can affect the characteristic signatures of important biological aerosols. A variety of biological aerosols are examined.

Paper Details

Date Published: 11 May 2007
PDF: 11 pages
Proc. SPIE 6554, Chemical and Biological Sensing VIII, 65540Q (11 May 2007);
Show Author Affiliations
M. E. Thomas, Johns Hopkins Univ. Applied Physics Lab. (United States)
M. B. Airola, Johns Hopkins Univ. Applied Physics Lab. (United States)
C. C. Carter, Johns Hopkins Univ. Applied Physics Lab. (United States)
N. T. Boggs, Johns Hopkins Univ. Applied Physics Lab. (United States)

Published in SPIE Proceedings Vol. 6554:
Chemical and Biological Sensing VIII
Augustus W. Fountain III, Editor(s)

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