Characterizing and monitoring respiratory aerosols by light scattering |
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Authors: | Pan Yong-Le Aptowicz Kevin B Chang Richard K Hart Matt Eversole Jay D |
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Affiliation: | Department of Applied Physics and Center for Laser Diagnostics, Yale University, New Haven, Connecticut 06520, USA. |
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Abstract: | The elastic-scattering intensity pattern from a single particle as a function of spherical coordinate angles theta and phi provides detailed information on the pattern's morphology. By use of an ellipsoidal reflector and a CCD camera, a single-laser-shot intensity pattern from a large angular range (theta from 90 degrees to 168 degrees and phi from 0 degrees to 360 degrees) was detected from a single aerosol (e.g., a Bacillus subtilisspore, a 1-microm-diameter polystyrene latex sphere, or a cluster of either of these) flowing through the reflectors focal volume at 5 m/s. Noticeable difference in the large-angle-range two-dimensional angular optical scattering (LATAOS) suggest that the LATAOS pattern could be useful in differentiating and classifying life-threatening aerosols from normal background aerosols. |
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