Spectral refractive index and extinction cross-section of BG spores

Marc B. Airola; Nathan T. Boggs; Joany Jackman; Raul Fainchtein; Christopher C. Carter; Michael E. Thomas

doi:10.1117/12.609032

12 May 2005 Spectral refractive index and extinction cross-section of BG spores

Marc B. Airola, Nathan T. Boggs, Joany Jackman, Raul Fainchtein, Christopher C. Carter, Michael E. Thomas

Author Affiliations +

Proceedings Volume 5795, Chemical and Biological Sensing VI; (2005) https://doi.org/10.1117/12.609032
Event: Defense and Security, 2005, Orlando, Florida, United States

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.

Citation Download Citation

Marc B. Airola, Nathan T. Boggs, Joany Jackman, Raul Fainchtein, Christopher C. Carter, and Michael E. Thomas "Spectral refractive index and extinction cross-section of BG spores", Proc. SPIE 5795, Chemical and Biological Sensing VI, (12 May 2005); https://doi.org/10.1117/12.609032

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