Zero method of controlling quadrupole mass spectrometer and cont

Details Zero method of controlling quadrupole mass spectrometer and cont Zero method of controlling quadrupole mass spectrometer and cont

1996-09-04

1998-03-31

Anderson, Bruce

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250282, B01D 5944, H01J 4900

Patent

active

057341630

ABSTRACT:
A quadrupole mass spectrometer which gives a uniform mass separation over a large mass number range without being affected by the nob-linear characteristics of the components of a control circuit arrangement and comprises an all-solid-state control circuit by using an O-method according to the invention to compare the positive or negative peak value U+V or U-V of U+Vcos.omega. t or the positive or negative peak value V-U or --U+V of --U-Vcos.omega. t, U+Vcos.omega. t and --U-Vcos.omega. t being voltages given to two pairs of rods of a quadrupole section respectively, to reference voltage (U.sub.o +V.sub.o) or (U.sub.o -V.sub.o) or (--U.sub.o +V.sub.o) or (--U.sub.o -V.sub.o), U.sub.o and V.sub.o being a DC voltage and the peak value of RF voltage to which U and V should be controlled and minimize the difference between the peak value (RF+DC) voltages to the high precision reference voltages as mentioned above.

REFERENCES:
patent: 3784814 (1974-01-01), Sakai et al.
patent: 3829689 (1974-08-01), Tsukakoshi et al.
patent: 4816675 (1989-03-01), Fies et al.
patent: 5177359 (1993-01-01), Hiroki et al.
patent: 5422482 (1995-06-01), Nakajima et al.

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