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Proceedings Paper

Shape characteristics of biological spores
Author(s): Daniel V. Hahn; Diane Limsui; Richard I. Joseph; Kevin C. Baldwin; Nathan T. Boggs; Alison K. Carr; Christopher C. Carter; Timothy S. Han; Michael E. Thomas
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Paper Abstract

Calculation of scattering properties of biological materials has classically been addressed using numerical calculations based on T-matrix theory. These calculations use bulk optical properties, particle size distribution, and a limited selection of shape descriptors to calculate the resulting aerosol properties. However, the most applicable shape available in T-matrix codes, the spheroid, is not the best descriptor of most biological materials. Based on imagery of the spores of Bacillus atrophaeus and Bacillus anthracis, capsule and egg shapes are mathematically described and programmed into the Amsterdam Discrete Dipole Approximation (ADDA). Spectrally dependent cross sections and depolarization ratios are calculated and a comparison made to spheroidal shapes of equivalent sizes.

Paper Details

Date Published: 21 April 2008
PDF: 10 pages
Proc. SPIE 6954, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX, 69540W (21 April 2008); doi: 10.1117/12.777637
Show Author Affiliations
Daniel V. Hahn, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Diane Limsui, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Richard I. Joseph, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Kevin C. Baldwin, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Nathan T. Boggs, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Alison K. Carr, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Christopher C. Carter, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Timothy S. Han, The Johns Hopkins Univ. Applied Physics Lab. (United States)
Michael E. Thomas, The Johns Hopkins Univ. Applied Physics Lab. (United States)


Published in SPIE Proceedings Vol. 6954:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX
Augustus Way Fountain; Patrick J. Gardner, Editor(s)

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