AC-modulation quadrupole mass spectrometer

Details AC-modulation quadrupole mass spectrometer AC-modulation quadrupole mass spectrometer

1986-11-24

1987-09-22

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250281, 250290, B01D 5944

Patent

active

046957243

ABSTRACT:
A quadrupole mass spectrometer generates a stream of ionized particles which are modulated by an AC voltage and transmitted through a quadrupole analyzer to a detection unit. The detection unit detects at a collector electrode thereof a modulated ion current which is fed to a phase detector. The phase detector synchronizes the modulated ion current with a signal of known frequency to produce a DC voltage representative of the level of the modulated ion current. By modulating the ionized particles with the AC voltage, the S/N ratio is improved and adverse effects of external noise are diminished.

REFERENCES:
patent: 2921198 (1960-01-01), Warmoltz et al.
patent: 3555271 (1971-01-01), Brubaker et al.
patent: 4409482 (1983-10-01), Scheid et al.

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