Title:
MASS SPECTROMETER
Document Type and Number:
WIPO Patent Application WO/2010/150301
Kind Code:
A1
Abstract:
In an ion detector, the voltages from power supplies (21 - 23) in which the voltages can be independently controlled are applied to first to fifth stage dynodes (11 - 15), a final stage dynode (16), and an anode (17) in a secondary electron multiplier tube (10). Furthermore, the signal from the anode (17) is extracted, and the signal from the fifth stage dynode (15), which has a low electron multiplier rate, is extracted. These two signals are converted in parallel to digital values, taken in by a data processing unit (34), and stored in a data storage unit (35). When the mass spectrum is created in the data processing unit (34), the two detected data for the same time are read out, and the presence or absence of signal saturation or waveform deformation is estimated from the values of one of the detected data. If there is a high risk of signal saturation, the detected data are selected based on the signals in the intermediate stages, and the level is corrected. Signal saturation caused by the application of independent voltages to the secondary electron multiplier tube (10) is not likely to occur. Even if saturation temporarily occurs, an unsaturated signal can be reflected in the mass spectrum.
Inventors:
IZUMI, Hideaki (1 Nishinokyo-Kuwabara-cho, Nakagyo-ku, Kyoto-sh, Kyoto 11, 〒6048511, JP)
Application Number:
JP2009/002822
Publication Date:
December 29, 2010
Filing Date:
June 22, 2009
Export Citation:
Assignee:
Shimadzu Corporation (1 Nishinokyo-Kuwabara-cho, Nakagyo-ku Kyoto-sh, Kyoto 11, 〒6048511, JP)
株式会社島津製作所 (〒11 京都府京都市中京区西ノ京桑原町１番地 Kyoto, 〒6048511, JP)
株式会社島津製作所 (〒11 京都府京都市中京区西ノ京桑原町１番地 Kyoto, 〒6048511, JP)
International Classes:
H01J49/06; H01J43/30
Attorney, Agent or Firm:
KOBAYASI, Ryohei et al. (Kyoto International Patent Law Office, Hougen-Sizyokarasuma Building 37, Motoakuozi-tyo, Higasinotouin Sizyo-sagaru, Simogyo-ku, Kyoto-s, Kyoto 91, 〒6008091, JP)
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