Pulsed discharge ionization source for miniature ion mobility spectrometers
US6822225B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2002 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Sep 26, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/622
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus is disclosed for flowing a sample gas and a reactant gas (38, 43) past a corona discharge electrode (26) situated at a first location in an ion drift chamber (24), applying a pulsed voltage waveform comprising a varying pulse component and a dc bias component to the corona discharge electrode (26) to cause a corona which in turn produces ions from the sample gas and the reactant gas, applying a dc bias to the ion drift chamber (24) to cause the ions to drift to a second location (25) in the ion drift chamber (24), detecting the ions at the second location (25) in the drift chamber (24), and timing the period for the ions to drift from the corona discharge electrode to the selected location in the drift chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.