Title:
TIME-OF-FLIGHT MASS SPECTROMETRY DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/122276
Kind Code:
A1
Abstract:
In this invention, an acceleration voltage generation unit (7) causes a switch unit (74) to drive on and off a direct current high voltage generated at a high-voltage power source unit (75) in order to generate a high-voltage pulse to be applied to a push-out electrode (11). A drive pulse signal is supplied from the control unit (6) to the switch unit (74) through a primary side drive unit (71), a transformer (72), and a secondary side drive unit (73). While the measurement period for repeated measurements varies depending on the m/z range, a primary voltage control unit (61) controls the primary side power source unit (76) in such a manner that the primary side voltage is changed depending on the measurement period, and adjusts the voltage applied from the primary side drive unit (71) to the two ends of the primary coil in the transformer (72). Due to LC resonance, the pulse signal supplied to the switch unit (74) overshoots, under the influence whereof the voltage at ramp-up start time of the pulse signal is different depending on the measurement period. However, an offset in the timing wherewith the ramp-up slope crosses the MOSFET threshold voltage can be compensated for, regardless of the voltage difference at ramp-up start time, by adjusting the primary side voltage. As a result, high mass accuracy irrespective of the measurement period can be achieved.
Inventors:
MIZUTANI SHIRO (JP)
Application Number:
PCT/JP2016/050704
Publication Date:
July 20, 2017
Filing Date:
January 12, 2016
Export Citation:
Assignee:
SHIMADZU CORP (JP)
International Classes:
H01J49/40; H01J49/10
Foreign References:
| JP2001283767A | 2001-10-12 | |||
| JP2002231179A | 2002-08-16 | |||
| JP2009031201A | 2009-02-12 | |||
| JP2008108739A | 2008-05-08 |
Other References:
See also references of EP 3404695A4
Attorney, Agent or Firm:
KYOTO INTERNATIONAL PATENT LAW OFFICE (JP)
Download PDF: