Patent ID: 9741551
Date: 2017-08-22
CPC Classifications: H01J

Claim:
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; a 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, wherein the pulse detection electrode arrangement comprises a conversion electrode mounted interior to the mass analyzer, a first pulse detection electrode, and a second pulse detection electrode, the electrostatic field being configured such that ion packets hit the conversion electrode, causing secondary particles to be emitted and an external detection electrode arrangement mounted exterior to the mass analyzer and located to detect the secondary particles from the conversion electrode; a pulse differential amplifier, arranged to provide the pulse transient signal based on the difference between a detection signal generated in the first pulse detection electrode and a detection signal generated in the second pulse detection electrode; and a processor, configured to identify ion intensity with respect to mass-to-charge ratio, based on the pulse transient signal.