Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Reexamination Certificate
2006-07-18
2006-07-18
Wells, Nikita (Department: 2881)
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
C250S286000, C250S282000
Reexamination Certificate
active
07078680
ABSTRACT:
The present invention is directed to a system and a method for analyzing and identifying an unknown sample using ion mobility spectrometry. The method pulses an ion gate using a temporally spaced pattern of ion admitting periods and ion repelling periods to achieve an admission duty cycle of about 50% of the total scan time. Ions passing through the drift tube strike an ion detector, generating a time dependent mobility spectrum. A combination of wavelet decomposition and statistical evaluators are used on the mobility spectrum to produce a distinct signature associated with the sample. Signatures are also generated for a number of known agents, and the known agent signatures are used to program a neural network. The sample signature is then compared to the signatures for the known agents using a fuzzy decision maker.
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Fulton, Jr. Jack E.
Griffin Matthew T.
McAtee Robert F.
Quash Anthony
Stanley Michael P.
The United States of America as represented by the Secretary of
Wells Nikita
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