Parallax-free gas detector for x-rays
US4954710A · kind A · utility
5Cited by
1References
10Claims
0Family size
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Key dates
| Filing date | Apr 27, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Apr 27, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J47/008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An X-ray gas detector for analyzing a material by studying X-ray diffraction. In order to minimize the parallax error without resorting to auxiliary electrodes, difficult to manufacture, a radial field in the whole gas space (40) is generated only by means of input electrodes (36) set to appropriate voltages and by means of lateral electrodes (44) also individually set to appropriate voltages. By modifying the voltages, it is also possible to move the center of the spheric equipotentials for permitting the analysis without parallax error of samples (20) placed at variable distances (D) from mthe input window (32) of the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.