Patent ID: 9520280
Filing Date: 2016-12-13
CPC Classification: H01J

Claim Text:
1. A mass analyzer, comprising: an electrostatic field generator, arranged to provide an electrostatic field causing ion packets to oscillate along a longitudinal direction with a period, the electrostatic field generator including an outer electrode coaxial with at least an inner electrode, at least one of the out electrode assembly and the inner electrode assembly including a plurality of electrode segments; a pulse detection electrode arrangement including at least one pulse detection electrode, the at least one pulse detection electrode being an electrode segment of the plurality of electrode segments located near a center of the electrostatic field generator in the longitudinal direction, the pulse detection electrode arrangement configured to detect a pulse transient signal over a time duration that is significantly shorter than the period of the ion packet oscillation; a harmonic detection electrode arrangement including two or more harmonic detection electrodes, the harmonic detection electrodes being electrode segments of the plurality of electrode segments located near the ends of the electrostatic field generator in the longitudinal direction, the harmonic detection electrode arrangement configured to detect a harmonic transient signal continuously over a time duration which is at least 30% relative to the total time of ion packet harmonic motion; and a processor, configured to identify ion intensity with respect to mass-to-charge ratio, based on the pulse transient signal and the harmonic transient signal wherein a width in the longitudinal direction of a pulse detection electrode of the pulse detection electrode arrangement is significantly smaller than a width in the longitudinal direction of a harmonic detection electrode arrangement.