Quadrupole mobility spectrometer
US3935452A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1973 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Nov 14, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/623
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to an atmospheric pressure quadrupole mobility spectrometer for detecting and identifying trace amounts of various molecular species present in a gas. The invention includes an outer housing comprising forward and rear sections which define forward and rear chambers. The gas under analysis is caused to flow into the inlet part of the forward section where ionizers mounted around the circumference of the forward chamber convert a portion of the molecular species present in the gas into stable molecular ions suitable for analysis. Towards the center portion of the forward chamber a carrier gas is mixed with gas and ions so formed. Four parallel, cylindrical electrodes symmetrically positioned about the longitudinal axis of the rear chamber are connected in opposing pairs to a bipolar power supply which supplies a predetermined repetitive voltage waveform to the electrodes thereby creating a generally hyperbolic electric field between the electrodes. The gas under analysis containing the molecular ions and the carrier gas flow between the electrodes where the molecular ions interact with the electric field. The electric field is such that only molecular i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.