Title:
QUADRUPOLE MASS SPECTROMETER AND ADJUSTING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2010/023706
Kind Code:
A1
Abstract:
A conventional quadrupole mass spectrometer required to set a threshold voltage in a discriminator (52) of a detection circuit portion (5) high because the radiation noise from a quadrupole mass filter (2) to which a high-frequency voltage is applied comes into an ion detector (3). Therefore, amplitudes in high-frequency voltage generating sections (41, 44) for generating high-frequency voltages applied to rod electrodes (21 to 24) are adapted to be adjustable. The two high-frequency voltage derived radiation noises coming into the ion detector (3) can negate each other by properly adjusting the amplitudes of the high-frequency voltages in mutually opposite phases to reduce a high-frequency noise appearing in an output signal of the ion detector (3). With this, the threshold voltage in the discriminator (52) can be made smaller and the voltages applied to the ion detector (3) can be suppressed to extend the life of the ion detector (3).
Inventors:
MIZUTANI SHIRO (JP)
Application Number:
PCT/JP2008/002289
Publication Date:
March 04, 2010
Filing Date:
August 25, 2008
Export Citation:
Assignee:
SHIMADZU CORP (JP)
MIZUTANI SHIRO (JP)
MIZUTANI SHIRO (JP)
International Classes:
H01J49/42; G01N27/62
Foreign References:
| JP2002033075A | 2002-01-31 | |||
| JPH08321278A | 1996-12-03 |
Attorney, Agent or Firm:
KOBAYASI, Ryohei et al. (JP)
Ryohei Kobayashi (JP)
Ryohei Kobayashi (JP)
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