Louvered beam stop for lowering x-ray limit of a total pressure gauge
US6476612B1 · kind B1 · utility
1Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2001 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Apr 19, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L21/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an ionization gauge, the effect of X-rays emitted when a collimated electron beam strikes grid surfaces in the gauge structure is reduced by a louvered beam stop. The louvered beam stop creates shadow regions having no X-rays, thus minimizing the amount of X-rays striking the collector plate and reducing the X-ray effect portion of the residual current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.