Gain control for a quadrupole mass spectrometer

Details Gain control for a quadrupole mass spectrometer Gain control for a quadrupole mass spectrometer

1974-03-29

1976-03-23

Church, Craig E.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250300, H01J 3934

Patent

active

039462293

ABSTRACT:
A quadrupole mass spectrometer gain control system for continually analyzing a gas mixture with accuracy. A quadrupole mass filter is located in the system to receive the gas mixture output from an ionization source. The quadrupole mass filter is operated in such a manner as to sequentially select the mass channel, detect mass peak amplitudes, and compensate for mass dependencies of individual channels through which an output signal representative of the percentages of an individual gas in the mixture is transmitted to a display. To compensate for system gain variations occurring in the ionization source, mass filter, ion detector, and detector preamplification function, a system gain control is provided in which the sum of the constituent gas amplitudes is compared with a 100% amplitude reference, and the error signal used to control the system gain.

REFERENCES:
patent: 3510647 (1970-05-01), Wood
patent: 3641340 (1972-02-01), Van Der Grinten
patent: 3648047 (1972-03-01), Bushman
patent: 3823315 (1974-07-01), Mosharrafa

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