Patent ID: 8796618
Filing Date: 2014-08-05
Classification: H01J

Abstract:
1. A method of controlling a pipeline-type ion cyclotron resonance mass spectrometer including a sample injection/ionization unit, a first ion transmission unit connected to the sample injection/ionization unit, an ion selection unit connected to the first ion transmission unit, an ion collision unit connected to the ion selection unit, a second ion transmission unit connected to the ion collision unit, an ion trap connected to the second ion transmission unit and collecting ions to detect an electrical signal representing the mass of the ions, two excitation electrodes exciting the ions in the ion trap and detecting the electrical signal, two detection electrodes detecting the electrical signal, an arbitrary waveform generating unit controlled by a computer and generating an arbitrary waveform, a high frequency amplification unit connected to arbitrary waveform generating unit, a switching unit connected between the high frequency amplification unit and the excitation electrodes of the ion trap, a first pre-amplifier connected to the detection electrodes of the ion trap, a first digitizer connected to the first pre-amplifier, a second pre-amplifier connected to the switching unit, a second digitizer connected to the second pre-amplifier, and a control unit sequentially controlling the respective units for measuring samples, the method comprising: a) ionizing and discharging sequentially injected samples by the sample injection/ionization unit; b) transmitting ions discharged from the sample injection/ionization unit to the ion selection unit by the first ion transmission unit; c) selecting or separating, and discharging the transmitted ions by the ion selection unit; d) colliding the ions selected or separated by the ion selection unit with a collision gas to divide the ions into smaller sizes and discharging the divided ions by the ion collision unit; e) transmitting the ions to the ion trap by the second ion transmission unit; f) collecting the transmitted ions by the ion trap; g) switching the switching unit to connect the high frequency amplification unit with the excitation electrodes in order to transmit the arbitrary waveform from the high frequency amplification unit to the excitation electrodes when the arbitrary waveform is input from the high frequency amplification unit to the switching unit; h) detecting a first electrical signal representing the mass of the ions of a first sample only by the detection electrodes, transmitting the first electrical signal to the first pre-amplifier, digitalizing the first electrical signal by the first digitizer and transmitting the digitalized first electrical signal to the computer, for signal processing; i) switching the switching unit to connect the excitation electrodes to the second pre-amplifier in order to detect a second electrical signal representing the mass of the ions of a second sample alternately with the detection electrodes, when the arbitrary waveform is not input from the high frequency amplification unit to the switching unit; and j) detecting the second electrical signal representing the mass of the ions of the second sample only by the excitation electrodes, transmitting the second electrical signal to the switching unit, digitalizing the second electrical signal by the second digitizer and transmitting the digitalized second electrical signal to the computer, for signal processing; wherein the step h) and the steps i) through j) are processed alternately such that the detection electrodes and the excitation electrodes alternately detect said respective electrical signals of the samples to be measured sequentially, and, before completion of the signal processing of the first electrical signal for the first sample, the second electrical signal for the second sample is detected, thereby reducing a time delay due to the signal processing in said pre-amplifiers, said digitizers and the computer and reducing a total processing time for measuring the samples.