Low-photon flux image-intensified electronic camera
US7129464B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Oct 19, 2004 |
| Grant date | Oct 31, 2006 |
| Priority date | — |
| Expiry date | May 11, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2231/5016
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low-photon flux image-intensified electronic camera comprises a gallium arsenide phosphide (GaAsP) photocathode in a high vacuum tube assembly behind a hermetic front seal to receive image photons. Such is cooled by a Peltier device to −20° C. to 0° C., and followed by a dual microchannel plate. The microchannels in each plate are oppositely longitudinally tilted away from the concentric to restrict positive ions that would otherwise contribute to the generation high brightness “scintillation” noise events at the output of the image. A phosphor-coated output fiberoptic conducts intensified light to an image sensor device. This too is chilled and produces a camera signal output. A high voltage power supply connected to the dual microchannel plate provides for gain control and photocathode gating and shuttering. A fiberoptic taper is used at the output of the image intensifier vacuum tube as a minifier between the internal output fiberoptic and the image sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.