Analysis systems detecting particle size and fluorescence

Details Analysis systems detecting particle size and fluorescence Analysis systems detecting particle size and fluorescence

2006-06-06

2006-06-06

Evans, F. L. (Department: 2877)

Optics: measuring and testing

With plural diverse test or art

C356S073000, C356S318000, C356S336000, C356S338000, C250S288000, C250S461100

Reexamination Certificate

active

07057712

ABSTRACT:
Particle analyzing systems with fluorescence detection are disclosed, primarily in connection with particle sizing based on scattered light intensity or time-of-flight measurement. In one system, emission of fluorescence is used as a threshold for selecting particles for further analysis, e.g. mass spectrometry. In another embodiment, laser beams arranged sequentially along an aerosol path are selectively switched on and off, to increase the useful life of components, and diminish the potential for interference among several signals. Other embodiments advantageously employ color discrimination in aerodynamic particle sizing, single detectors positioned to sense both scattered and emitted fluorescent radiation, and laser beam amplitude or gain control to enhance the range of fluorescence detection.

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