Quadrupole mass filter
US6940068B2 · kind B2 · utility
1Cited by
5References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2003 |
| Grant date | Sep 6, 2005 |
| Priority date | — |
| Expiry date | Oct 13, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/4215
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus and method to improve the filtering action of a quadrupole mass filter by reducing a precursor fault caused by an asymmetric electrical field between a pair of opposing electrode rods in a y-axis of the quadrupole mass filter. Processing means for processing detector data determine the filtering action of the quadrupole mass filter by checking for a precursor fault. If a precursor fault is detected then power supply control means introduce an AC potential difference across the electrode rods in the y-axis in order to reduce asymmetry in the electrical field in the y-axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.