Monitoring
US6822238B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2002 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Jun 4, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J47/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides apparatus and methods which facilitate movement of an instrument relative to an item or location being monitored and/or the item or location relative to the instrument, whilst successfully excluding extraneous ions from the detection location. Thus, ions generated by emissions from the item or location can successfully be monitored during movement. The technique employs sealing to exclude such ions, for instance, through an electro-field which attracts and discharges the ions prior to their entering the detecting location and/or using a magnetic field configured to repel the ions away from the detecting location.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.