Downhole navigation and detection system
US7763845B2 · kind B2 · utility
18Cited by
16References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2006 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Aug 14, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/107
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photodiode whose long-wavelength cutoff is in the short-wavelength range (preferably, between ultraviolet and yellowish-green) having reduced temperature sensitivity is used in downhole applications. It may be matched with scintillation devices having an output matched to the response curve of the photodiode for use with nuclear logging devices. The photodiode may also be used in gyroscopes in which light from an LED matched to the photodiode is reflected from a spinning mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.