Radiant energy – Ionic separation or analysis – Methods
Reexamination Certificate
2011-07-05
2011-07-05
Wells, Nikita (Department: 2881)
Radiant energy
Ionic separation or analysis
Methods
C250S281000, C250S292000, C250S290000
Reexamination Certificate
active
07973277
ABSTRACT:
A radio frequency (RF) drive system and method for driving the ion trap or mass filter of a mass spectrometer has a programmable RF frequency source coupled to a RF gain stage. The RF gain stage is transformer coupled to a tank circuit formed with the ion trap or mass filter. The power of the RF gain stage driving the ion trap or mass filter is measured using a sensing circuit and a power circuit. A feedback value is generated by the power circuit that is used to adjust the RF frequency source. The frequency of the RF frequency source is adjusted until the power of the RF gain stage is at a minimum level. The frequency value setting the minimum power is used to operate the RF drive system at the resonance frequency of the tank circuit formed with the transformer secondary inductance and the ion trap or mass filter capacitance. Driving a mass spectrometer mass selection element this way results in the lower power consumption, an inherently filtered clean drive signal, smaller size, and reduced electromagnetic emissions.
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1ST Detect Corporation
Fish & Richardson P.C.
Wells Nikita
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