Driving a mass spectrometer ion trap or mass filter

H - Electricity – 01 – J

Patent

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H01J 49/02 (2006.01)

Patent

CA 2725525

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.

Linvention concerne un système de pilotage à radiofréquence (RF) et un procédé pour piloter le piège à ions ou le filtre de masse dun spectromètre de masse comprenant une source de fréquence RF programmable connectée à un étage damplification RF. Létage damplification RF est connecté par le biais dun transformateur à un circuit de résonance formé par le piège à ions ou le filtre de masse. La puissance de létage damplification RF qui pilote le piège à ions ou le filtre de masse est mesurée à laide dun circuit de détection et dun circuit de puissance. Une valeur de contre-réaction est générée par le circuit de puissance qui est utilisée pour régler la source de fréquence RF. La fréquence de la source de fréquence RF est ajustée jusquà ce que la puissance de létage damplification RF se trouve à un niveau minimum.

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