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Real-time detection method and system for identifying individual aerosol particles

United States Patent

August 21, 2007
View the Complete Patent at the US Patent & Trademark Office
Lawrence Livermore National Laboratory - Visit the Industrial Partnerships Office Website
An improved method and system of identifying individual aerosol particles in real time. Sample aerosol particles are collimated, tracked, and screened to determine which ones qualify for mass spectrometric analysis based on predetermined qualification or selection criteria. Screening techniques include one or more of determining particle size, shape, symmetry, and fluorescence. Only qualifying particles passing all screening criteria are subject to desorption/ionization and single particle mass spectrometry to produce corresponding test spectra, which is used to determine the identities of each of the qualifying aerosol particles by comparing the test spectra against predetermined spectra for known particle types. In this manner, activation cycling of a particle ablation laser of a single particle mass spectrometer is reduced.
Gard; Eric E. (San Francisco, CA), Coffee; Keith R. (Patterson, CA), Frank; Matthias (Oakland, CA), Tobias; Herbert J. (Kensington, CA), Fergenson; David P. (Alamo, CA), Madden; Norm (Livermore, CA), Riot; Vincent J. (Berkeley, CA), Steele; Paul T. (Livermore, CA), Woods; Bruce W. (Livermore, CA)
The Regents of the University of California (Oakland, CA)
10/ 916,737
August 11, 2004
The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG48 between the United States Department of Energy and the University of California for the operation of Lawrence Livermore National Laboratory.