Spectroscopic plasma torch for microwave induced plasmas
US5083004A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1989 |
| Grant date | Jan 21, 1992 |
| Priority date | — |
| Expiry date | May 9, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05H1/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A spectroscopic plasma torch suitable for use at atmospheric pressure is disclosed. The torch utilizes a microwave induced helium plasma confined in a plasma discharge tube. The plasma is suspended and stabilized by a vortex flow of helium. The torch includes a high velocity gas jet for introducing sample materials into the plasma. The design avoids the formation of carbon deposits in the plasma discharge tube caused by the premature pyrolysis of organic materials outside the plasma and prevents other sample materials from being adsorbed on the surface of the plasma tube. Because of these characteristics, the torch is particularly well suited for use as a component in a gas chromatography detector which employs helium as the plasma support gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.