Alternating current discharge ionization detector
US6333632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1999 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Sep 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/70
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A discharge ionization detector (DID) includes a sensor that uses an alternating current (AC) discharge through a working gas as an ionization source. The sensor includes a discharge chamber, into which the working gas is introduced, and an ionization chamber, into which a sample gas is introduced. UV photons from the discharge chamber and metastable particles that enter the ionization chamber from the discharge chamber ionize molecules in the sample gas. The ions generated from the ionized sample gas are measured as a current indicating the quantity of ionizable molecules in the sample gas. For selective identification of molecules in the sample gas, one or more chemical filters can filter the sample gas to separate target gases from gases that interfere with detection of the target gases. Additionally, a supply for the working gas can change the working gas to change the maximum energy available for ionization of the sample gas. Thus, current measurements with different working gases indicate quantities of classes of molecules having different ionization potentials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.