Control system for mass spectrometer
US4221964A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1979 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Feb 12, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An RF control system suitable for use in a mass spectrometer of the type having an ionization chamber, a mass filter and an ion detector. A constant frequency RF voltage is applied to the filter. The magnitude of the RF signal is varied in response to a DC control signal to permit selected ions having a desired charge-to-mass ratio to pass through the filter and strike the detector. In the control system the generated RF signal is attenuated and added to the DC control signal. The resultant voltage is applied to a comparator-integrator circuit that is arranged to provide a control signal capable of precisely holding the output of the RF generator at a predetermined peak voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.