Title:
TIME-OF-FLIGHT MASS SPECTROMETRY DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/037440
Kind Code:
A1
Abstract:
In this invention, an acceleration voltage generation unit (7) causes a direct-current high-voltage that is generated at a high-voltage power source unit (75) to be driven ON and OFF by a switch unit (74) to generate a high-voltage pulse to be applied to a pusher electrode (11). A driving pulse signal is supplied to the switch unit (74) from a control unit (6) through a primary side drive unit (71), a transformer (72), and a secondary side drive unit (73). A primary voltage control unit (61) receives from a temperature sensor (77) the results of temperature measurements in the surroundings of the acceleration voltage generation unit (7) and controls a primary side power source unit (76) so that the primary side voltage is changed in response to this temperature. This adjusts the voltage applied to both ends of the primary winding of the transformer (72). A change in the surrounding temperature changes the characteristics of a MOSFET, or the like, in the switch unit (74), shifting the rise and fall timing of the high-voltage pulse; however, the adjustment of the primary side voltage changes the inclination of the slope of the MOSFET gate voltage rise, allowing the shift in the rise and fall timing of the high-voltage pulse to be corrected. As a result, a high mass accuracy can be achieved regardless of the surrounding temperature.
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Inventors:
MIZUTANI SHIRO (JP)
Application Number:
PCT/JP2016/074336
Publication Date:
March 01, 2018
Filing Date:
August 22, 2016
Export Citation:
Assignee:
SHIMADZU CORP (JP)
International Classes:
H01J49/40; G01N27/62
Foreign References:
| US20080087810A1 | 2008-04-17 | |||
| JPH10199475A | 1998-07-31 | |||
| JPH10112282A | 1998-04-28 | |||
| JP2001283767A | 2001-10-12 | |||
| JP2014518380A | 2014-07-28 |
Other References:
See also references of EP 3503162A4
Attorney, Agent or Firm:
KYOTO INTERNATIONAL PATENT LAW OFFICE (JP)
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