Share Email Print

Proceedings Paper

Single aerosol particle selection and capture using laser scattering and fluorescence
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A dual wavelength UV-LIF fluorescence system that uses 266 nm and 355 nm laser pulses to sequentially excite single aerosol particles has been shown to provide significant discrimination between biological and ambient as well as differentiation among classes of biological particles. This particle classification data can then be used to trigger an electrostatic capture mechanism to deposit individual potential bio-threats particles onto a stainless steel substrate and particles that are not classified as targets are discharged with the exiting airflow. Timing and velocity information for each on-the-fly particle are critical for setting an appropriate delay to capture the particles of interest. A novel CW laser beam technique has been developed to measure the velocity of each particle and initiate a timing sequence. The electrostatic capture mechanism then electrically charges identified particles and produces a time-delayed electric field to drive them into the stainless steel substrate. The resulting collected sample is highly enriched with target, or potential threat, particles in comparison to their percentage in the ambient air. This presentation will describe the unique optical interrogation and diagnostic techniques that have been developed to make this achievement possible, as well as provide the latest system performance results.

Paper Details

Date Published: 2 October 2008
PDF: 11 pages
Proc. SPIE 7116, Optically Based Biological and Chemical Detection for Defence IV, 71160F (2 October 2008); doi: 10.1117/12.799890
Show Author Affiliations
Jay D. Eversole, Naval Research Lab. (United States)
Vasanthi Sivaprakasam, Naval Research Lab. (United States)
Timothy A. Pletcher, Sarnoff Corp. (United States)
David Keller, Sarnoff Corp. (United States)

Published in SPIE Proceedings Vol. 7116:
Optically Based Biological and Chemical Detection for Defence IV
John C. Carrano; Arturas Zukauskas, Editor(s)

© SPIE. Terms of Use
Back to Top