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Proceedings Paper

Spectral refractive index and extinction cross-section of BG spores
Author(s): Marc B. Airola; Nathan T. Boggs; Joany Jackman; Raul Fainchtein; Christopher C. Carter; Michael E. Thomas
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Paper Abstract

Despite the wide spread need for optical cross-section data on single spore bio-aerosols, available databases are sparse and unreliable. Information reported is based on short path measurements on high concentration media containing particle clusters. This represents an upper bound to the single spore cross-section. Measurements on single spore aerosolized media demand long path lengths and moderate particle concentration. Transmittance measurements need to be in the single scatter limit as well. These requirements are often difficult to meet. We present a procedure that leads to aerosol extinction and backscatter cross-sections in a straightforward manner. Transmittance measurements of thin films of bio-aerosols are used to obtain the bulk refractive index. This result and the measured size distribution can be used in a T-matrix calculation to yield the desired cross-sections. To illustrate this technique, infrared cross-sections are obtained for Bacillus globigii.

Paper Details

Date Published: 12 May 2005
PDF: 8 pages
Proc. SPIE 5795, Chemical and Biological Sensing VI, (12 May 2005); doi: 10.1117/12.609032
Show Author Affiliations
Marc B. Airola, Johns Hopkins Univ. (United States)
Nathan T. Boggs, Johns Hopkins Univ. (United States)
Joany Jackman, Johns Hopkins Univ. (United States)
Raul Fainchtein, Johns Hopkins Univ. (United States)
Christopher C. Carter, Johns Hopkins Univ. (United States)
Michael E. Thomas, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 5795:
Chemical and Biological Sensing VI
Patrick J. Gardner, Editor(s)

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