Patent ID: 9570279
Date: 2017-02-14
CPC Classifications: H01J

Claim:
1. A mass analyzer comprising: two rotating electric field units, each of the two rotating electric field units having a plurality of elongated electrodes parallel to and equidistant from a central axis which runs through a center of an inlet to the two rotating electric field units and a center of an outlet of the two rotating electric field units, along which ions have travelled, the two rotating electric field units lined in tandem, leaving a drift space for ions between the two rotating electric field units; and a plurality of high frequency sinusoidal signal generators configured to generate and apply high frequency sinusoidal signals to the plurality of elongated electrodes of each of the two rotating electric field units, such that i) high frequency sinusoidal signals applied to the plurality of elongated electrodes of a first rotating electric field unit of the two rotating electric field units, having a period equal to a transit time of a specified mass ion in the first rotating electric field unit and a phase difference from each other to rotate an electric field within the first rotating electric field unit, make ions entering the first rotating electric field unit at the center of the inlet diverge outward within the first rotating electric field unit and leave the first rotating electric field unit having a certain distance from the central axis, and make specified mass ions travel the drift space parallel to the central axis, and (ii) high frequency sinusoidal signals applied to the plurality of elongated electrodes of a second rotating electric field unit of the two rotating electric field units, having a period equal to the period of the high frequency sinusoidal signals applied to the first rotating electric field unit and a phase difference from each other to rotate an electric field within the second rotating electric field unit, with a phase angle of the rotating electric field of the second rotating electric field unit at t=T