Chemistry: analytical and immunological testing – Nuclear magnetic resonance – electron spin resonance or other...
Patent
1997-10-03
1999-12-07
Soderquist, Arlen
Chemistry: analytical and immunological testing
Nuclear magnetic resonance, electron spin resonance or other...
436183, 250281, 250282, 250286, 250287, 250288, 250289, G01N 2400, B01D 5944, H01J 4900
Patent
active
059982152
ABSTRACT:
A portable analyzer for determining the size and chemical composition of particles suspended in an aerosol. The aerosol is accelerated through a nozzle and skimmers, to produce a well-defined beam of particles, the speed of which is inversely related to the particle size. A dual-beam laser system positioned along the beam path detects light scattered from each particle, to determine the particle's velocity and thus its aerodynamic size. The laser system also triggers a laser to produce a beam that irradiates the particle, to desorb it into its constituent molecules. The particle is desorbed in a source region of a bipolar, time-of-flight mass spectrometer, which provides a mass-to-charge spectrum of the desorbed molecule, thereby chemically characterizing the material of the particle. Several structural features provide sufficient ruggedness to allow the analyzer to be easily used in the field with minimum calibration and maintenance.
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Mayer Joseph E.
Prather Kimberly A.
Brueggemann James R.
Soderquist Arlen
The Regents of the University of California
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